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Re: repurposing torqeedo 2.0 to inboard engine?

 

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John,

I think you are right to view removing the old engines as quite a big job. Don’t underestimate that part. ?Then getting an electric setup that will deliver enough power to let you get planing speeds for more than a few of minutes (many options but for example 4 AC motors ~80kw and at least 15kwh of battery is the ballpark) ?becomes a considerable cost.?

I’ve helped a few people in my area price out converting similar power boats and each time we’ve landed at the same $30k-$50k total cost. ?If you have a really fantastic boat and the engines are dead, it might make sense. ?I ended up with one client in that situation who is diving into it. We have yet to really find out but in theory the electric drives and battery systems should last for decades - longer than you will own the boat, unless you are quite young.?

On May 17, 2021, at 10:01, john via groups.io <oak_box@...> wrote:

?
Carsten,
The BIGGEST problem is that they haven't been run or cared for in the past 20 years.? I had a retired buddy that was "car friendly" helping me with them (and paid him a few $$, which worked for both of us).? My objective, beyond just getting them to run - was to get them back into great, reliable shape.

First, rebuilt the carbs, then rebuilt the raw water intake pumps, new hoses, belts, plugs, starters.? New electric fuel pump to replace the mechanical fuel pump.? New water circulation pump, new intake manifold (on port engine - probably on starboard too).? Pulled the heads on the port engine and had them machined, and new valves put in (old valves were all shot, with little or no compression on most of the cylinders). New lifters, new rods.? Port engine is now running - though clattering loudly (not a valve adjustment - maybe a lifter or rod that wasn't adjusted properly?) - so still need to get a mechanic that really knows what he's doing to look at it and finish the job.

Starboard engine will start and run if primed, but also has bad compression on 3 cylinders - so need to pull the heads and have valves done on it.? Old buddy was much less expensive than a "real" mechanic, but has too many other things to do to be available on a reasonable basis.? I've dealt with most of the boat shops at one time or another, and don't trust any of them to do a decent job.? ?I've got one last guy to try - but he's swamped with work after the freeze we had this past winter took out a bunch of engines....

I would LOVE swapping out all the potential sources of problems of the gas engines for electric motors that just run, don't freeze, and don't have so many holes in the bottom of the boat.? ?But...? ?repowering with electric would probably cost (WILD swag) $30-50K to get old motors out, new engines in, and minimal battery capacity.? If I can find a mechanic that can pull and re-install the heads, and tweak things - I should be able to be back in business for around $5K - keep the boat good as original condition (resale value maintained), and be able to scoot down the lake if I need to at some point.

I have toyed with putting motor brackets on the swim platform, and getting a second Torqeedo 4.0.? ?That would cost another $4-5K for the 2nd motor (I have one), and several thousand for a minimal battery just for proof of concept.? And I'm concerned that two Torqeedo's on the swim platform wouldn't be able to give me enough differential thrust to manage the boat at the dock (at least without adding a bow thruster).

Sigh.

John

On Monday, May 17, 2021, 11:06:37 AM CDT, Carsten via groups.io <carstensemail@...> wrote:


John, just curious, what's wrong with the Chev's ?
(I know, not related to electric...)

On Monday, 17 May 2021, 21:37:19 GMT+8, john via groups.io <oak_box@...> wrote:


Carsten,
I think the bad reverse performance is mainly an issue of the outboard having to fight against the hull and keel.??

I previously had a Catalina 27 with a 10hp 4-stroke outboard in a motor well (behind the keel and rudder).? Same thing - did great in forward, but very limited power in reverse.? If I had a strong north wind, I wasn't able to back into it with sufficient control to safely leave the marina.

This may be somewhat also due to the prop being less efficient in reverse (due to cup design).? But I suspect fighting the keel was the bigger issue.

I really wish the economics were better for electric.
I currently have a Chris Craft Commander 410 with two Chevy V8 454 big block engines that are not healthy.? I still believe the engines can be brought back - but finding a good mechanic that will show up and get the job done on my lake is proving extremely frustrating!? ?I've thought more than a few times about repowering the boat with electric (probably mostly hybrid, running off a generator - to keep the cost of the battery bank within reason).? Butttt....? ?Getting those two V8 blocks out of the engine room below the main salon will be extremely difficult.? Plus - best possible speed will still be limited to 5-6mph - slower than a trawler, and slower than many sailboats.? I've gotten used to the Dark Side, and prefer a cruising speed of 7-10mph, and really like the option of being able to get up on plane if I need to so that I can get somewhere in a hurry if necessary.

I have taken a LOT of inspiration from this web site:??, as his boat is very close to mine (his is a few years older, and mine has the flybridge - meaning more drag, weight, and windage - but at least in the ball park).? But it also serves as a good reality check.

John

On Monday, May 17, 2021, 01:22:14 AM CDT, Carsten via groups.io <carstensemail@...> wrote:


Thanks, John

I may reconsider that solution, as you said the reverse was not good. Probably because of the pod ?
When anchoring, I need full reverse power to dig the anchor.

I guess that yellowchair does not need the full reverse power, if he already does well with his present configuration.

Two T4.0's is a bit over my budget, as it is more than I paid for my Maxi 87 1976 boat :-)

I also considered to get rid of my saildrive and make two shaft drives (!!)
By doing so, there is redundancy, and high maneuverability.

Anyone here with two shaft drives on their boat ?

Cheers,
Carsten


On Monday, 17 May 2021, 11:22:18 GMT+8, john via groups.io <oak_box@...> wrote:


Carsten,
If you're really going to go that route, I'd recommend two Torqeedo T4.0's.
I mounted one as an experiment on an Catalina 30.? One Torqeedo would push the boat at very slow speed. Reverse was abysmal.? I could get by with it as an emergency backup when my Atomic 4 gas engine failed, and neeed to get into my slip once returned to the marina.

However, a single 15-20hp outboard gas engine would be MUCH more cost effective, and get the job done more practically.? I know this is an "electric boat forum", and I own 2 Torqeedos, and have done a fair amount of experimenting with them.? But they're a very expensive solution that is significantly more complicated than a gas outboard.

John

On Sunday, May 16, 2021, 08:19:25 PM CDT, Carsten via groups.io <carstensemail@...> wrote:


What is your use of the Torqueedo now ?
It seems that you only use it for docking, slow motorsailing etc. as it is a small configuration for your 5T boat.

How about two Torqueedos, one starboard, one port ?
Doubled power, and far better maneuverability when docking.
You just need to buy/find one more T2.0, more batteries, and make the new (retractable) brackets.
No hazzle with mounting an inboard.

Just an idea, as I am considering making two on my mono 4 tonner too.

Carsten

On Monday, 17 May 2021, 03:43:33 GMT+8, yellowchair@... <yellowchair@...> wrote:


I have a 28 foot, 5 ton, Tyler Twister (long keel) with a Torqeedo 2.0 mounted on a home made bracket on the (transom hung) rudder. Due to the steeply angled transom, there is no ideal way to mount an outboard, so I am contemplating going back to an inboard engine. What do you guys think of using the Torqeedo 2.0 as an inboard engine? Perhaps a belt drive to the propeller shaft? I'm sure this would void any warranty, but would it work? Would cooling be an issue? Any comments appreciated.

Re: repurposing torqeedo 2.0 to inboard engine?

 

Carsten,
The BIGGEST problem is that they haven't been run or cared for in the past 20 years.? I had a retired buddy that was "car friendly" helping me with them (and paid him a few $$, which worked for both of us).? My objective, beyond just getting them to run - was to get them back into great, reliable shape.

First, rebuilt the carbs, then rebuilt the raw water intake pumps, new hoses, belts, plugs, starters.? New electric fuel pump to replace the mechanical fuel pump.? New water circulation pump, new intake manifold (on port engine - probably on starboard too).? Pulled the heads on the port engine and had them machined, and new valves put in (old valves were all shot, with little or no compression on most of the cylinders). New lifters, new rods.? Port engine is now running - though clattering loudly (not a valve adjustment - maybe a lifter or rod that wasn't adjusted properly?) - so still need to get a mechanic that really knows what he's doing to look at it and finish the job.

Starboard engine will start and run if primed, but also has bad compression on 3 cylinders - so need to pull the heads and have valves done on it.? Old buddy was much less expensive than a "real" mechanic, but has too many other things to do to be available on a reasonable basis.? I've dealt with most of the boat shops at one time or another, and don't trust any of them to do a decent job.? ?I've got one last guy to try - but he's swamped with work after the freeze we had this past winter took out a bunch of engines....

I would LOVE swapping out all the potential sources of problems of the gas engines for electric motors that just run, don't freeze, and don't have so many holes in the bottom of the boat.? ?But...? ?repowering with electric would probably cost (WILD swag) $30-50K to get old motors out, new engines in, and minimal battery capacity.? If I can find a mechanic that can pull and re-install the heads, and tweak things - I should be able to be back in business for around $5K - keep the boat good as original condition (resale value maintained), and be able to scoot down the lake if I need to at some point.

I have toyed with putting motor brackets on the swim platform, and getting a second Torqeedo 4.0.? ?That would cost another $4-5K for the 2nd motor (I have one), and several thousand for a minimal battery just for proof of concept.? And I'm concerned that two Torqeedo's on the swim platform wouldn't be able to give me enough differential thrust to manage the boat at the dock (at least without adding a bow thruster).

Sigh.

John

On Monday, May 17, 2021, 11:06:37 AM CDT, Carsten via groups.io <carstensemail@...> wrote:


John, just curious, what's wrong with the Chev's ?
(I know, not related to electric...)

On Monday, 17 May 2021, 21:37:19 GMT+8, john via groups.io <oak_box@...> wrote:


Carsten,
I think the bad reverse performance is mainly an issue of the outboard having to fight against the hull and keel.??

I previously had a Catalina 27 with a 10hp 4-stroke outboard in a motor well (behind the keel and rudder).? Same thing - did great in forward, but very limited power in reverse.? If I had a strong north wind, I wasn't able to back into it with sufficient control to safely leave the marina.

This may be somewhat also due to the prop being less efficient in reverse (due to cup design).? But I suspect fighting the keel was the bigger issue.

I really wish the economics were better for electric.
I currently have a Chris Craft Commander 410 with two Chevy V8 454 big block engines that are not healthy.? I still believe the engines can be brought back - but finding a good mechanic that will show up and get the job done on my lake is proving extremely frustrating!? ?I've thought more than a few times about repowering the boat with electric (probably mostly hybrid, running off a generator - to keep the cost of the battery bank within reason).? Butttt....? ?Getting those two V8 blocks out of the engine room below the main salon will be extremely difficult.? Plus - best possible speed will still be limited to 5-6mph - slower than a trawler, and slower than many sailboats.? I've gotten used to the Dark Side, and prefer a cruising speed of 7-10mph, and really like the option of being able to get up on plane if I need to so that I can get somewhere in a hurry if necessary.

I have taken a LOT of inspiration from this web site:??, as his boat is very close to mine (his is a few years older, and mine has the flybridge - meaning more drag, weight, and windage - but at least in the ball park).? But it also serves as a good reality check.

John

On Monday, May 17, 2021, 01:22:14 AM CDT, Carsten via groups.io <carstensemail@...> wrote:


Thanks, John

I may reconsider that solution, as you said the reverse was not good. Probably because of the pod ?
When anchoring, I need full reverse power to dig the anchor.

I guess that yellowchair does not need the full reverse power, if he already does well with his present configuration.

Two T4.0's is a bit over my budget, as it is more than I paid for my Maxi 87 1976 boat :-)

I also considered to get rid of my saildrive and make two shaft drives (!!)
By doing so, there is redundancy, and high maneuverability.

Anyone here with two shaft drives on their boat ?

Cheers,
Carsten


On Monday, 17 May 2021, 11:22:18 GMT+8, john via groups.io <oak_box@...> wrote:


Carsten,
If you're really going to go that route, I'd recommend two Torqeedo T4.0's.
I mounted one as an experiment on an Catalina 30.? One Torqeedo would push the boat at very slow speed. Reverse was abysmal.? I could get by with it as an emergency backup when my Atomic 4 gas engine failed, and neeed to get into my slip once returned to the marina.

However, a single 15-20hp outboard gas engine would be MUCH more cost effective, and get the job done more practically.? I know this is an "electric boat forum", and I own 2 Torqeedos, and have done a fair amount of experimenting with them.? But they're a very expensive solution that is significantly more complicated than a gas outboard.

John

On Sunday, May 16, 2021, 08:19:25 PM CDT, Carsten via groups.io <carstensemail@...> wrote:


What is your use of the Torqueedo now ?
It seems that you only use it for docking, slow motorsailing etc. as it is a small configuration for your 5T boat.

How about two Torqueedos, one starboard, one port ?
Doubled power, and far better maneuverability when docking.
You just need to buy/find one more T2.0, more batteries, and make the new (retractable) brackets.
No hazzle with mounting an inboard.

Just an idea, as I am considering making two on my mono 4 tonner too.

Carsten

On Monday, 17 May 2021, 03:43:33 GMT+8, yellowchair@... <yellowchair@...> wrote:


I have a 28 foot, 5 ton, Tyler Twister (long keel) with a Torqeedo 2.0 mounted on a home made bracket on the (transom hung) rudder. Due to the steeply angled transom, there is no ideal way to mount an outboard, so I am contemplating going back to an inboard engine. What do you guys think of using the Torqeedo 2.0 as an inboard engine? Perhaps a belt drive to the propeller shaft? I'm sure this would void any warranty, but would it work? Would cooling be an issue? Any comments appreciated.

Re: repurposing torqeedo 2.0 to inboard engine?

 

John, just curious, what's wrong with the Chev's ?
(I know, not related to electric...)

On Monday, 17 May 2021, 21:37:19 GMT+8, john via groups.io <oak_box@...> wrote:


Carsten,
I think the bad reverse performance is mainly an issue of the outboard having to fight against the hull and keel.??

I previously had a Catalina 27 with a 10hp 4-stroke outboard in a motor well (behind the keel and rudder).? Same thing - did great in forward, but very limited power in reverse.? If I had a strong north wind, I wasn't able to back into it with sufficient control to safely leave the marina.

This may be somewhat also due to the prop being less efficient in reverse (due to cup design).? But I suspect fighting the keel was the bigger issue.

I really wish the economics were better for electric.
I currently have a Chris Craft Commander 410 with two Chevy V8 454 big block engines that are not healthy.? I still believe the engines can be brought back - but finding a good mechanic that will show up and get the job done on my lake is proving extremely frustrating!? ?I've thought more than a few times about repowering the boat with electric (probably mostly hybrid, running off a generator - to keep the cost of the battery bank within reason).? Butttt....? ?Getting those two V8 blocks out of the engine room below the main salon will be extremely difficult.? Plus - best possible speed will still be limited to 5-6mph - slower than a trawler, and slower than many sailboats.? I've gotten used to the Dark Side, and prefer a cruising speed of 7-10mph, and really like the option of being able to get up on plane if I need to so that I can get somewhere in a hurry if necessary.

I have taken a LOT of inspiration from this web site:??, as his boat is very close to mine (his is a few years older, and mine has the flybridge - meaning more drag, weight, and windage - but at least in the ball park).? But it also serves as a good reality check.

John

On Monday, May 17, 2021, 01:22:14 AM CDT, Carsten via groups.io <carstensemail@...> wrote:


Thanks, John

I may reconsider that solution, as you said the reverse was not good. Probably because of the pod ?
When anchoring, I need full reverse power to dig the anchor.

I guess that yellowchair does not need the full reverse power, if he already does well with his present configuration.

Two T4.0's is a bit over my budget, as it is more than I paid for my Maxi 87 1976 boat :-)

I also considered to get rid of my saildrive and make two shaft drives (!!)
By doing so, there is redundancy, and high maneuverability.

Anyone here with two shaft drives on their boat ?

Cheers,
Carsten


On Monday, 17 May 2021, 11:22:18 GMT+8, john via groups.io <oak_box@...> wrote:


Carsten,
If you're really going to go that route, I'd recommend two Torqeedo T4.0's.
I mounted one as an experiment on an Catalina 30.? One Torqeedo would push the boat at very slow speed. Reverse was abysmal.? I could get by with it as an emergency backup when my Atomic 4 gas engine failed, and neeed to get into my slip once returned to the marina.

However, a single 15-20hp outboard gas engine would be MUCH more cost effective, and get the job done more practically.? I know this is an "electric boat forum", and I own 2 Torqeedos, and have done a fair amount of experimenting with them.? But they're a very expensive solution that is significantly more complicated than a gas outboard.

John

On Sunday, May 16, 2021, 08:19:25 PM CDT, Carsten via groups.io <carstensemail@...> wrote:


What is your use of the Torqueedo now ?
It seems that you only use it for docking, slow motorsailing etc. as it is a small configuration for your 5T boat.

How about two Torqueedos, one starboard, one port ?
Doubled power, and far better maneuverability when docking.
You just need to buy/find one more T2.0, more batteries, and make the new (retractable) brackets.
No hazzle with mounting an inboard.

Just an idea, as I am considering making two on my mono 4 tonner too.

Carsten

On Monday, 17 May 2021, 03:43:33 GMT+8, yellowchair@... <yellowchair@...> wrote:


I have a 28 foot, 5 ton, Tyler Twister (long keel) with a Torqeedo 2.0 mounted on a home made bracket on the (transom hung) rudder. Due to the steeply angled transom, there is no ideal way to mount an outboard, so I am contemplating going back to an inboard engine. What do you guys think of using the Torqeedo 2.0 as an inboard engine? Perhaps a belt drive to the propeller shaft? I'm sure this would void any warranty, but would it work? Would cooling be an issue? Any comments appreciated.

Re: repurposing torqeedo 2.0 to inboard engine?

 

Carston,?
Forget about using an outboard. Your boat is very similar to my previous boat, pacific seacraft Orion, and is not designed for an outboard.
Get the thunderstruck 10kw kit, sell torqueedo, or keep it for the dinghy.?
I would ditch the wind generator, get more solar, Get a 48v to 12v converter. Then you only need 1 battery pack.
The battery pack is the biggest decision. I would get lithium iron phosphate. If you are only using it for in and out of the marina, I would get 5kw/hours. And if you need to go for longer motoring trips, get a Honda 2000 generator.

Kevin?

On Mon, May 17, 2021, 9:37 AM john via <oak_box=[email protected]> wrote:
Carsten,
I think the bad reverse performance is mainly an issue of the outboard having to fight against the hull and keel.??

I previously had a Catalina 27 with a 10hp 4-stroke outboard in a motor well (behind the keel and rudder).? Same thing - did great in forward, but very limited power in reverse.? If I had a strong north wind, I wasn't able to back into it with sufficient control to safely leave the marina.

This may be somewhat also due to the prop being less efficient in reverse (due to cup design).? But I suspect fighting the keel was the bigger issue.

I really wish the economics were better for electric.
I currently have a Chris Craft Commander 410 with two Chevy V8 454 big block engines that are not healthy.? I still believe the engines can be brought back - but finding a good mechanic that will show up and get the job done on my lake is proving extremely frustrating!? ?I've thought more than a few times about repowering the boat with electric (probably mostly hybrid, running off a generator - to keep the cost of the battery bank within reason).? Butttt....? ?Getting those two V8 blocks out of the engine room below the main salon will be extremely difficult.? Plus - best possible speed will still be limited to 5-6mph - slower than a trawler, and slower than many sailboats.? I've gotten used to the Dark Side, and prefer a cruising speed of 7-10mph, and really like the option of being able to get up on plane if I need to so that I can get somewhere in a hurry if necessary.

I have taken a LOT of inspiration from this web site:??, as his boat is very close to mine (his is a few years older, and mine has the flybridge - meaning more drag, weight, and windage - but at least in the ball park).? But it also serves as a good reality check.

John

On Monday, May 17, 2021, 01:22:14 AM CDT, Carsten via <carstensemail=[email protected]> wrote:


Thanks, John

I may reconsider that solution, as you said the reverse was not good. Probably because of the pod ?
When anchoring, I need full reverse power to dig the anchor.

I guess that yellowchair does not need the full reverse power, if he already does well with his present configuration.

Two T4.0's is a bit over my budget, as it is more than I paid for my Maxi 87 1976 boat :-)

I also considered to get rid of my saildrive and make two shaft drives (!!)
By doing so, there is redundancy, and high maneuverability.

Anyone here with two shaft drives on their boat ?

Cheers,
Carsten


On Monday, 17 May 2021, 11:22:18 GMT+8, john via <oak_box=[email protected]> wrote:


Carsten,
If you're really going to go that route, I'd recommend two Torqeedo T4.0's.
I mounted one as an experiment on an Catalina 30.? One Torqeedo would push the boat at very slow speed. Reverse was abysmal.? I could get by with it as an emergency backup when my Atomic 4 gas engine failed, and neeed to get into my slip once returned to the marina.

However, a single 15-20hp outboard gas engine would be MUCH more cost effective, and get the job done more practically.? I know this is an "electric boat forum", and I own 2 Torqeedos, and have done a fair amount of experimenting with them.? But they're a very expensive solution that is significantly more complicated than a gas outboard.

John

On Sunday, May 16, 2021, 08:19:25 PM CDT, Carsten via <carstensemail=[email protected]> wrote:


What is your use of the Torqueedo now ?
It seems that you only use it for docking, slow motorsailing etc. as it is a small configuration for your 5T boat.

How about two Torqueedos, one starboard, one port ?
Doubled power, and far better maneuverability when docking.
You just need to buy/find one more T2.0, more batteries, and make the new (retractable) brackets.
No hazzle with mounting an inboard.

Just an idea, as I am considering making two on my mono 4 tonner too.

Carsten

On Monday, 17 May 2021, 03:43:33 GMT+8, yellowchair@... <yellowchair@...> wrote:


I have a 28 foot, 5 ton, Tyler Twister (long keel) with a Torqeedo 2.0 mounted on a home made bracket on the (transom hung) rudder. Due to the steeply angled transom, there is no ideal way to mount an outboard, so I am contemplating going back to an inboard engine. What do you guys think of using the Torqeedo 2.0 as an inboard engine? Perhaps a belt drive to the propeller shaft? I'm sure this would void any warranty, but would it work? Would cooling be an issue? Any comments appreciated.

Re: repurposing torqeedo 2.0 to inboard engine?

 

Carsten,
I think the bad reverse performance is mainly an issue of the outboard having to fight against the hull and keel.??

I previously had a Catalina 27 with a 10hp 4-stroke outboard in a motor well (behind the keel and rudder).? Same thing - did great in forward, but very limited power in reverse.? If I had a strong north wind, I wasn't able to back into it with sufficient control to safely leave the marina.

This may be somewhat also due to the prop being less efficient in reverse (due to cup design).? But I suspect fighting the keel was the bigger issue.

I really wish the economics were better for electric.
I currently have a Chris Craft Commander 410 with two Chevy V8 454 big block engines that are not healthy.? I still believe the engines can be brought back - but finding a good mechanic that will show up and get the job done on my lake is proving extremely frustrating!? ?I've thought more than a few times about repowering the boat with electric (probably mostly hybrid, running off a generator - to keep the cost of the battery bank within reason).? Butttt....? ?Getting those two V8 blocks out of the engine room below the main salon will be extremely difficult.? Plus - best possible speed will still be limited to 5-6mph - slower than a trawler, and slower than many sailboats.? I've gotten used to the Dark Side, and prefer a cruising speed of 7-10mph, and really like the option of being able to get up on plane if I need to so that I can get somewhere in a hurry if necessary.

I have taken a LOT of inspiration from this web site:??, as his boat is very close to mine (his is a few years older, and mine has the flybridge - meaning more drag, weight, and windage - but at least in the ball park).? But it also serves as a good reality check.

John

On Monday, May 17, 2021, 01:22:14 AM CDT, Carsten via groups.io <carstensemail@...> wrote:


Thanks, John

I may reconsider that solution, as you said the reverse was not good. Probably because of the pod ?
When anchoring, I need full reverse power to dig the anchor.

I guess that yellowchair does not need the full reverse power, if he already does well with his present configuration.

Two T4.0's is a bit over my budget, as it is more than I paid for my Maxi 87 1976 boat :-)

I also considered to get rid of my saildrive and make two shaft drives (!!)
By doing so, there is redundancy, and high maneuverability.

Anyone here with two shaft drives on their boat ?

Cheers,
Carsten


On Monday, 17 May 2021, 11:22:18 GMT+8, john via groups.io <oak_box@...> wrote:


Carsten,
If you're really going to go that route, I'd recommend two Torqeedo T4.0's.
I mounted one as an experiment on an Catalina 30.? One Torqeedo would push the boat at very slow speed. Reverse was abysmal.? I could get by with it as an emergency backup when my Atomic 4 gas engine failed, and neeed to get into my slip once returned to the marina.

However, a single 15-20hp outboard gas engine would be MUCH more cost effective, and get the job done more practically.? I know this is an "electric boat forum", and I own 2 Torqeedos, and have done a fair amount of experimenting with them.? But they're a very expensive solution that is significantly more complicated than a gas outboard.

John

On Sunday, May 16, 2021, 08:19:25 PM CDT, Carsten via groups.io <carstensemail@...> wrote:


What is your use of the Torqueedo now ?
It seems that you only use it for docking, slow motorsailing etc. as it is a small configuration for your 5T boat.

How about two Torqueedos, one starboard, one port ?
Doubled power, and far better maneuverability when docking.
You just need to buy/find one more T2.0, more batteries, and make the new (retractable) brackets.
No hazzle with mounting an inboard.

Just an idea, as I am considering making two on my mono 4 tonner too.

Carsten

On Monday, 17 May 2021, 03:43:33 GMT+8, yellowchair@... <yellowchair@...> wrote:


I have a 28 foot, 5 ton, Tyler Twister (long keel) with a Torqeedo 2.0 mounted on a home made bracket on the (transom hung) rudder. Due to the steeply angled transom, there is no ideal way to mount an outboard, so I am contemplating going back to an inboard engine. What do you guys think of using the Torqeedo 2.0 as an inboard engine? Perhaps a belt drive to the propeller shaft? I'm sure this would void any warranty, but would it work? Would cooling be an issue? Any comments appreciated.

Re: repurposing torqeedo 2.0 to inboard engine?

 

For the wind generator, you could keep your 12v system separate from your 48v propulsion system, and let the wind generator charge for house battery use.?
For the Solar, you will need a 48v solar controller, and probably more solar panels.
Or sell wind generator, and get a 48v to 12v converter to run house loads.

On Mon, May 17, 2021, 3:57 AM <yellowchair@...> wrote:
Yes, I mostly use the torqeedo to get in and out of the marina. It would be nice to have more power in reverse, and maneverability is not great, even mounted on the rudder. It's a hassle to pull the motor out of the water (slides up on the bracket), and the control cable is rather exposed. For all these reasons, I am likely going for an inboard solution, and probablly a Thunderstruck kit. On that note, what is the best way to integrate my current 12 volt solar and wind power to a 48 volt system? I currently have 2 solar panels. Get 2 more and run them in series? Any way to integrate the 12 volt wind generator? I have gathered that a 12 to 48 volt step-up converter is not the way to go.
Cheers,
Lars

Re: repurposing torqeedo 2.0 to inboard engine?

 

Yes, I mostly use the torqeedo to get in and out of the marina. It would be nice to have more power in reverse, and maneverability is not great, even mounted on the rudder. It's a hassle to pull the motor out of the water (slides up on the bracket), and the control cable is rather exposed. For all these reasons, I am likely going for an inboard solution, and probablly a Thunderstruck kit. On that note, what is the best way to integrate my current 12 volt solar and wind power to a 48 volt system? I currently have 2 solar panels. Get 2 more and run them in series? Any way to integrate the 12 volt wind generator? I have gathered that a 12 to 48 volt step-up converter is not the way to go.
Cheers,
Lars
Re: repurposing torqeedo 2.0 to inboard engine?

 

Thanks, John

I may reconsider that solution, as you said the reverse was not good. Probably because of the pod ?
When anchoring, I need full reverse power to dig the anchor.

I guess that yellowchair does not need the full reverse power, if he already does well with his present configuration.

Two T4.0's is a bit over my budget, as it is more than I paid for my Maxi 87 1976 boat :-)

I also considered to get rid of my saildrive and make two shaft drives (!!)
By doing so, there is redundancy, and high maneuverability.

Anyone here with two shaft drives on their boat ?

Cheers,
Carsten


On Monday, 17 May 2021, 11:22:18 GMT+8, john via groups.io <oak_box@...> wrote:


Carsten,
If you're really going to go that route, I'd recommend two Torqeedo T4.0's.
I mounted one as an experiment on an Catalina 30.? One Torqeedo would push the boat at very slow speed. Reverse was abysmal.? I could get by with it as an emergency backup when my Atomic 4 gas engine failed, and neeed to get into my slip once returned to the marina.

However, a single 15-20hp outboard gas engine would be MUCH more cost effective, and get the job done more practically.? I know this is an "electric boat forum", and I own 2 Torqeedos, and have done a fair amount of experimenting with them.? But they're a very expensive solution that is significantly more complicated than a gas outboard.

John

On Sunday, May 16, 2021, 08:19:25 PM CDT, Carsten via groups.io <carstensemail@...> wrote:


What is your use of the Torqueedo now ?
It seems that you only use it for docking, slow motorsailing etc. as it is a small configuration for your 5T boat.

How about two Torqueedos, one starboard, one port ?
Doubled power, and far better maneuverability when docking.
You just need to buy/find one more T2.0, more batteries, and make the new (retractable) brackets.
No hazzle with mounting an inboard.

Just an idea, as I am considering making two on my mono 4 tonner too.

Carsten

On Monday, 17 May 2021, 03:43:33 GMT+8, yellowchair@... <yellowchair@...> wrote:


I have a 28 foot, 5 ton, Tyler Twister (long keel) with a Torqeedo 2.0 mounted on a home made bracket on the (transom hung) rudder. Due to the steeply angled transom, there is no ideal way to mount an outboard, so I am contemplating going back to an inboard engine. What do you guys think of using the Torqeedo 2.0 as an inboard engine? Perhaps a belt drive to the propeller shaft? I'm sure this would void any warranty, but would it work? Would cooling be an issue? Any comments appreciated.

Re: repurposing torqeedo 2.0 to inboard engine?

 

Carsten,
If you're really going to go that route, I'd recommend two Torqeedo T4.0's.
I mounted one as an experiment on an Catalina 30.? One Torqeedo would push the boat at very slow speed. Reverse was abysmal.? I could get by with it as an emergency backup when my Atomic 4 gas engine failed, and neeed to get into my slip once returned to the marina.

However, a single 15-20hp outboard gas engine would be MUCH more cost effective, and get the job done more practically.? I know this is an "electric boat forum", and I own 2 Torqeedos, and have done a fair amount of experimenting with them.? But they're a very expensive solution that is significantly more complicated than a gas outboard.

John

On Sunday, May 16, 2021, 08:19:25 PM CDT, Carsten via groups.io <carstensemail@...> wrote:


What is your use of the Torqueedo now ?
It seems that you only use it for docking, slow motorsailing etc. as it is a small configuration for your 5T boat.

How about two Torqueedos, one starboard, one port ?
Doubled power, and far better maneuverability when docking.
You just need to buy/find one more T2.0, more batteries, and make the new (retractable) brackets.
No hazzle with mounting an inboard.

Just an idea, as I am considering making two on my mono 4 tonner too.

Carsten

On Monday, 17 May 2021, 03:43:33 GMT+8, yellowchair@... <yellowchair@...> wrote:


I have a 28 foot, 5 ton, Tyler Twister (long keel) with a Torqeedo 2.0 mounted on a home made bracket on the (transom hung) rudder. Due to the steeply angled transom, there is no ideal way to mount an outboard, so I am contemplating going back to an inboard engine. What do you guys think of using the Torqeedo 2.0 as an inboard engine? Perhaps a belt drive to the propeller shaft? I'm sure this would void any warranty, but would it work? Would cooling be an issue? Any comments appreciated.

Re: repurposing torqeedo 2.0 to inboard engine?

 

What is your use of the Torqueedo now ?
It seems that you only use it for docking, slow motorsailing etc. as it is a small configuration for your 5T boat.

How about two Torqueedos, one starboard, one port ?
Doubled power, and far better maneuverability when docking.
You just need to buy/find one more T2.0, more batteries, and make the new (retractable) brackets.
No hazzle with mounting an inboard.

Just an idea, as I am considering making two on my mono 4 tonner too.

Carsten

On Monday, 17 May 2021, 03:43:33 GMT+8, yellowchair@... <yellowchair@...> wrote:


I have a 28 foot, 5 ton, Tyler Twister (long keel) with a Torqeedo 2.0 mounted on a home made bracket on the (transom hung) rudder. Due to the steeply angled transom, there is no ideal way to mount an outboard, so I am contemplating going back to an inboard engine. What do you guys think of using the Torqeedo 2.0 as an inboard engine? Perhaps a belt drive to the propeller shaft? I'm sure this would void any warranty, but would it work? Would cooling be an issue? Any comments appreciated.

Re: repurposing torqeedo 2.0 to inboard engine?

 

Talk to the supplier. My guess would be 5 kw min.


On Sun, May 16, 2021 at 3:43 PM, yellowchair@...
<yellowchair@...> wrote:
I have a 28 foot, 5 ton, Tyler Twister (long keel) with a Torqeedo 2.0 mounted on a home made bracket on the (transom hung) rudder. Due to the steeply angled transom, there is no ideal way to mount an outboard, so I am contemplating going back to an inboard engine. What do you guys think of using the Torqeedo 2.0 as an inboard engine? Perhaps a belt drive to the propeller shaft? I'm sure this would void any warranty, but would it work? Would cooling be an issue? Any comments appreciated.
Re: repurposing torqeedo 2.0 to inboard engine?

 

Sell torqueedo, buy Thunderstruck kit. Keep it simple.


On Sun, May 16, 2021, 5:21 PM Mike Gunning <mike@...> wrote:
You need a 10kW motor to move 5 toms.? I would think with that rudder, you would want an inboard for bettercontrol.? Do not see a good place to put a pod unless you mount it to the rudder

Re: Solar panel sale

 

Hi Jim,
I didn't find the inconsistency between the spec on the sale site and the spec sheet I found at

I don't understand the inconsistency involving 45W, 15.4V, and the product size.
The product of Imax of 2.9 and Vmax of 15.4 is 45 W if you round it up.? The I-V curve on the spec sheet gives higher numbers, but it's probably a cherry-picked I-V curve or one generated with the solar simulator set to more than one sun intensity.? 45 W from a 1.1 m^2 area is 4.0% efficiency which is reasonable for a-Si.? You'll get much more power per unit area from mono- or poly-Si, but without the feature of flexibility that doesn't cause a reduction of power output.
Cheers,
Halden
Re: Solar panel sale

 

Hi Eric and others,
$200 for a 45W (if the performance claim is accurate) panel is more than $4 per Wp.? Rigid Si panels go for around $1 per Wp.? Flexible mono- and poly-Si panels are also available for $1 to $2 per Wp.? But I'm not sure how their performance holds up if you bend them many times.? If the PowerFilm is a-Si, it probably doesn't degrade in response to getting bent back and forth multiple times.? So what you're paying for is the flexibility of the panel and its ability to continue working once you bend it.? If you don't need this feature, the rigid panels are a better value/$.
-Halden
Re: repurposing torqeedo 2.0 to inboard engine?

 

You need a 10kW motor to move 5 toms.? I would think with that rudder, you would want an inboard for bettercontrol.? Do not see a good place to put a pod unless you mount it to the rudder
Re: repurposing torqeedo 2.0 to inboard engine?

 

I have a Motenergy PMAC motor I’m not using. I can get you the specs if you’d like. I’m sure it’d gave more power than you 2kW Torgeedo.
Re: repurposing torqeedo 2.0 to inboard engine?

 

开云体育

Maybe easier to configure it as a pod drive? Torqeedo makes a 2kW - it isn’t as easy as me saying it, but basically configure it in that sort of fashion?



On May 16, 2021, at 4:02 PM, Glenn Holland <gholland1@...> wrote:

Just my initial .02,? there is probably someone out there who would trade an equiv. inboard elect. for your Torq. OB.? I certainly would, if I had it on hand.? It'll be a lot of engineering to put your's in the bilge.?

Sent: Sunday, May 16, 2021 3:24 PM
Subject: [electricboats] repurposing torqeedo 2.0 to inboard engine?

I have a 28 foot, 5 ton, Tyler Twister (long keel) with a Torqeedo 2.0 mounted on a home made bracket on the (transom hung) rudder. Due to the steeply angled transom, there is no ideal way to mount an outboard, so I am contemplating going back to an inboard engine. What do you guys think of using the Torqeedo 2.0 as an inboard engine? Perhaps a belt drive to the propeller shaft? I'm sure this would void any warranty, but would it work? Would cooling be an issue? Any comments appreciated.
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Re: repurposing torqeedo 2.0 to inboard engine?

 

开云体育

Just my initial .02,? there is probably someone out there who would trade an equiv. inboard elect. for your Torq. OB.? I certainly would, if I had it on hand.? It'll be a lot of engineering to put your's in the bilge.?

Sent: Sunday, May 16, 2021 3:24 PM
Subject: [electricboats] repurposing torqeedo 2.0 to inboard engine?

I have a 28 foot, 5 ton, Tyler Twister (long keel) with a Torqeedo 2.0 mounted on a home made bracket on the (transom hung) rudder. Due to the steeply angled transom, there is no ideal way to mount an outboard, so I am contemplating going back to an inboard engine. What do you guys think of using the Torqeedo 2.0 as an inboard engine? Perhaps a belt drive to the propeller shaft? I'm sure this would void any warranty, but would it work? Would cooling be an issue? Any comments appreciated.
repurposing torqeedo 2.0 to inboard engine?

 

I have a 28 foot, 5 ton, Tyler Twister (long keel) with a Torqeedo 2.0 mounted on a home made bracket on the (transom hung) rudder. Due to the steeply angled transom, there is no ideal way to mount an outboard, so I am contemplating going back to an inboard engine. What do you guys think of using the Torqeedo 2.0 as an inboard engine? Perhaps a belt drive to the propeller shaft? I'm sure this would void any warranty, but would it work? Would cooling be an issue? Any comments appreciated.
Electric Hovercraft

 

Hello all,

I'm in the planning phase for my next EV project: an electric hovercraft! I will be retiring my electric powerboat to sell the hull and trailer while keeping all of my electric drive components. So I have all of the batteries, switches, fuses, chargers, etc for a 48V 200A marine system. I don't have a motor I can reuse, as my boat used an e-Propulsion Navy 6 electric outboard.

So, the main fixed component I'll be using is my Valence U27-12XP batteries (12V 130AH LiFePO4). I have ten of these, but for weight I'll only be using 4 on the hovercraft (136lbs). If I can get by with 36V or 24V, that's a savings of 34 lbs per battery.

The hovercraft I'm building is a UH-10F from Universal Hovercraft. Hundreds of these have been built over the decades, many by high schoolers. It is a very simple and proven design, with only the electric motor and battery additions being new. Plenty of youtube videos if you want to see a UH-10F in action.

I don't intend to race it, but the racing class requirements say no more than a 12.5hp / 9.3kW engine. So using that as a guideline, the 10kW sailboat kit from Thunderstruck looks pretty good! The thrust fan should spin at about 2400 rpm, which coincidentally is the max speed of the ME1115 in the kit. Instead of a smaller water propeller I'll be turning a 36" 6 blade ducted fan.

Questions:
1. Given how well all those numbers line up, do I just direct drive the fan? Or is there a benefit to stepping up or down the RPM?
2. If I go down to 24V to save the 68 lbs, would I then use a belt drive to step up the RPM back to 2400 rpm? Or should I choose a different motor in that case?
3. The basic design diverts 30% of the thrust air under the skirt for lift. The enhanced design (UH-10F2) uses a separate lift and drive fan. There's some advantages to that but plenty of commercial designs only use one fan. However, if I could use two motors at 24V instead of one big motor at 48V it might make sense. Any thoughts on which way to go there?

Thanks,
Brian
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