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Re: 2:1 reduction gear

 

Thunderstruck has a pre-built reduction that might work for you.

On 6/2/2020 11:47 PM, Matthew Geier wrote:
I'm looking into re-battery and a general re-jigging of my system.

I've been running a 36v system but never running the controller over 50% throttle. Now that my T145s have shown signs of needing to be replaced after 11years, i'm thinking of going LiFePO ? on 48v and putting a 2:1 reduction on my Perm 132 perm mag motor. This would enable the motor to run faster at lower amps (cooler) and also have the motor running most of the time in the 'forward' direction. At my power output and voltage that the motor is running in reverse most of the time isn't actually a problem, but the brushes may last just that little bit longer with the motor running the 'correct' way. :-)

Any one have any points to a high efficiency gearbox of approx 2:1 ratio ? Most of the examples I've found so far also include clutches, a feature not needed here.

About 2.4-3kw moves my boat at hull speed, so I don't need something of high power capability.
2:1 reduction gear

 

I'm looking into re-battery and a general re-jigging of my system.

I've been running a 36v system but never running the controller over 50% throttle. Now that my T145s have shown signs of needing to be replaced after 11years, i'm thinking of going LiFePO ? on 48v and putting a 2:1 reduction on my Perm 132 perm mag motor. This would enable the motor to run faster at lower amps (cooler) and also have the motor running most of the time in the 'forward' direction. At my power output and voltage that the motor is running in reverse most of the time isn't actually a problem, but the brushes may last just that little bit longer with the motor running the 'correct' way. :-)

Any one have any points to a high efficiency gearbox of approx 2:1 ratio ? Most of the examples I've found so far also include clutches, a feature not needed here.

About 2.4-3kw moves my boat at hull speed, so I don't need something of high power capability.
AC vs DC gensets, how many?

 

We are in planning to parallel hybridise our 50' powercat. One of the questions (of many!) is the genset. We have an old Onan 6.5kW AC. We would probably remove it.?

But we will need more than solar to keep us going for many hours at slower speeds (higher speed = diesels). Do we go with large alternators off the diesels (maybe get 2kW off each) to supplement solar, or 1-2 gensets as main power supplemented by solar?? 2kW or even 4kW isnt going to be enough, so big alternators are probably out.

Given AC gensets are more common, and the i-series from fisher panda are variable speed, is there a lot of difference in this application to use AC or DC?

Also, apart from some obvious points, are there any advantages/disadvantages in two small units vs one? The i-series can parallel each other which seems an advantage for 2 units...

Thanks
Rob
Re: Time to re-power

 

I'd be interested in 48v? 90ah for my boat!


On Tue, Jun 2, 2020, 5:15 PM L Schmitz via <terminalift=[email protected]> wrote:
Hello Steve,? sorry for the delay.? ?I can sell you some of my extra cells.? 3.2 v 90 ah? I am happy with my 10 kw? 48v thunderstruck project? We are experimenting with cylinders and prisms for my work projects.? I can assemble and charge (cost only for a bms and bus bars.)? We are adding a phase change material to our boxes to minimize possible heat and waterproof my battery packs. It is a simple blend of paraffin wax and synthetic bees wax. All my projects are experimental at this point. Observed performance is our goal. We do not sell anything commercially.? cost only if you are interested.? 24v? 36v or 48v? ?available we can parallel? 90? ? ?180? ?270 or 360 ah? ? ? I use new West Marine heavy guage plastic battery boxes.??

I will send some pictures tomorrow.? I hope this helps.?

?Terminalift LLC
9444 Mission Park Place
Santee, CA 92071
Ph: (619) 562-0355
F: (619) 562-2060



On Sunday, May 31, 2020, 07:53:28 AM PDT, Steve Gjertson <sgjertson@...> wrote:


Hi Larry,?

I have been following this thread and would be interested a 48 v battery system. My email is sgjertson@...?

On Fri, May 22, 2020, 7:42 AM L Schmitz via <terminalift=[email protected]> wrote:
I have an extra 500 ? ?3.2 v 90 ah?cylinders with??bms devices and chargers. We are using big prismatic cells ?for our next??high voltage battery project ? I could duplicate my 48 v lifepo4?set up and charge only material cost if you are interested ?I will get you some pictures. We are in San Diego?


Best regards,
Larry Schmitz



On Friday, May 22, 2020, 5:21 AM, Larry Brown <elcapitanbrown@...> wrote:

Mine is Thunderstruck too.? For your size boat you can go with air cooled but need to make sure to get and engine compartment fan to circulate air.? No more water intake to get clogged with sea grass or some idiot¡¯s shopping bag floating by as you motor.? One of the beauties of the system.? It should push you just fine.? I use a couple eu2000 generators as backup for long distance trips but for day trips where you need a couple hours at most you can get by on batteries.

Anyway, good luck. ?

Larry


On May 21, 2020, at 11:01 PM, Ryan Sweet <ryan@...> wrote:

?
Do you have a link for the batteries you had success with? There are so many on offer and it seems quite hard to find much info about each company except for the us based ones and those are all twice as expensive (I recognize that this is possibly for good reasons).?

On May 21, 2020, at 18:14, L Schmitz via <terminalift=[email protected]> wrote:

?
I have had good luck with my 10kw?thunderstruck kit too. First installed 4??agm?batteries ? 12v 220 ah.?Then after 2 years replaced with lifepo4. An excellent upgrade?I assembled 4 battery boxes with 3.2v 90ah cylinders. Each box 4P4S?Then installed an?ant bms for balancing. The monitor is very good??for checking your system. If you decide to assemble your own battery system invest in a Flir Heat sensor. The Flir connects to your I?phone. You aim it at your wiring assembly under load. It detects hot spot?areas of concern in your connections. Battery, contactor ,controller and motor connections. 48 v 360 ah gives plenty of run time at 40 to 90 amp load.?

Best regards,
Larry Schmitz



On Thursday, May 21, 2020, 4:16 PM, Reuben Trane via <rjtrane=[email protected]> wrote:

Go to and look at their kits. I purchased 2 ea for my 12m Power cat. For your needs a 5kW to 10kW motor should do the job. Hard part is figuring out the reduction. I chose 3:1 to get a max prop RPM of 800.

48Vdc woks best. If it¡¯s in your budget assemble a battery from LiFePo4 cells

Feel free to ask me about my installation.

Reuben
Re: Time to re-power

 

Hello Steve,? sorry for the delay.? ?I can sell you some of my extra cells.? 3.2 v 90 ah? I am happy with my 10 kw? 48v thunderstruck project? We are experimenting with cylinders and prisms for my work projects.? I can assemble and charge (cost only for a bms and bus bars.)? We are adding a phase change material to our boxes to minimize possible heat and waterproof my battery packs. It is a simple blend of paraffin wax and synthetic bees wax. All my projects are experimental at this point. Observed performance is our goal. We do not sell anything commercially.? cost only if you are interested.? 24v? 36v or 48v? ?available we can parallel? 90? ? ?180? ?270 or 360 ah? ? ? I use new West Marine heavy guage plastic battery boxes.??

I will send some pictures tomorrow.? I hope this helps.?

?Terminalift LLC
9444 Mission Park Place
Santee, CA 92071
Ph: (619) 562-0355
F: (619) 562-2060



On Sunday, May 31, 2020, 07:53:28 AM PDT, Steve Gjertson <sgjertson@...> wrote:


Hi Larry,?

I have been following this thread and would be interested a 48 v battery system. My email is sgjertson@...?

On Fri, May 22, 2020, 7:42 AM L Schmitz via <terminalift=[email protected]> wrote:
I have an extra 500 ? ?3.2 v 90 ah?cylinders with??bms devices and chargers. We are using big prismatic cells ?for our next??high voltage battery project ? I could duplicate my 48 v lifepo4?set up and charge only material cost if you are interested ?I will get you some pictures. We are in San Diego?


Best regards,
Larry Schmitz



On Friday, May 22, 2020, 5:21 AM, Larry Brown <elcapitanbrown@...> wrote:

Mine is Thunderstruck too.? For your size boat you can go with air cooled but need to make sure to get and engine compartment fan to circulate air.? No more water intake to get clogged with sea grass or some idiot¡¯s shopping bag floating by as you motor.? One of the beauties of the system.? It should push you just fine.? I use a couple eu2000 generators as backup for long distance trips but for day trips where you need a couple hours at most you can get by on batteries.

Anyway, good luck. ?

Larry


On May 21, 2020, at 11:01 PM, Ryan Sweet <ryan@...> wrote:

?
Do you have a link for the batteries you had success with? There are so many on offer and it seems quite hard to find much info about each company except for the us based ones and those are all twice as expensive (I recognize that this is possibly for good reasons).?

On May 21, 2020, at 18:14, L Schmitz via <terminalift=[email protected]> wrote:

?
I have had good luck with my 10kw?thunderstruck kit too. First installed 4??agm?batteries ? 12v 220 ah.?Then after 2 years replaced with lifepo4. An excellent upgrade?I assembled 4 battery boxes with 3.2v 90ah cylinders. Each box 4P4S?Then installed an?ant bms for balancing. The monitor is very good??for checking your system. If you decide to assemble your own battery system invest in a Flir Heat sensor. The Flir connects to your I?phone. You aim it at your wiring assembly under load. It detects hot spot?areas of concern in your connections. Battery, contactor ,controller and motor connections. 48 v 360 ah gives plenty of run time at 40 to 90 amp load.?

Best regards,
Larry Schmitz



On Thursday, May 21, 2020, 4:16 PM, Reuben Trane via <rjtrane=[email protected]> wrote:

Go to and look at their kits. I purchased 2 ea for my 12m Power cat. For your needs a 5kW to 10kW motor should do the job. Hard part is figuring out the reduction. I chose 3:1 to get a max prop RPM of 800.

48Vdc woks best. If it¡¯s in your budget assemble a battery from LiFePo4 cells

Feel free to ask me about my installation.

Reuben
Re: Looking to Purchase an Electric Boat

 

¿ªÔÆÌåÓý

Winfield,? Is that your first or last name?? Anyway, I'll attach some photos of my boat.? It is not anybody's "stock" boat but it is built with known hardware.
Please ask me any questions.? There are two unique things about the boat/propulsion.
1.? There are two 82 lb. Motor Guide standard trolling motors mounted on custom steering bodies.
2.? One reason for twin OB's is the ability to turn by differential thrust.? This did not work as intended with two right hand props (standard Torquedo) .? A left hand matching prop was custom fabricated (scanned and 3D printed).? The boat will turn either direction?180 deg. within it's own length.? And BTW, I could be co-ersed into a Florida delivery.? Have several friends/family down there.
thanks,
Glenn Holland/NC

Sent: Thursday, May 21, 2020 4:16 AM
Subject: Re: [electricboats] Looking to Purchase an Electric Boat

Please also CC me photos
I live in SW Florida on Callosahatchie River on a 400 mile canal system?


On May 20, 2020, at 9:44 PM, Glenn Holland <gholland1@...> wrote:

?What are your waters?? I have an electric propelled Redwing 18 Iaunch for sale..? If you give me an email, I've got plenty of photos.
Glenn Holland/NC
gholland1@...

-----------------------------------------

From: abners@...
To: [email protected]
Cc:
Sent: Wednesday May 20 2020 9:34:12PM
Subject: [electricboats] Looking to Purchase an Electric Boat

Hi, does anyone have any suggestions on where I can buy a used GOOD QUALITY electric boat for a good price?
Also open to hearing offers.
Thanks

Re: Ten Socio-Emotional Benefits Of Sailing

 

Thanks, Jeff.

Just a heads up, the same original post (10 S-E Benefits...). hit another one of my boating groups today under the moniker ¡°Queen Nanu¡°. ?That group had questioned ¡°Faith¡± after the ¡°Heavy Weather....¡± post, it appears that there was a quick change in identity.?

So, if ¡°Queen Nanu¡± is already here, you might want to moderate or remove that account too.

I agree with Larry that it is a shame that the interwebs have come to this. ?I believe that our collective digital health relies on eternal vigilance, and we all play a part in that.

Click safely and carry on.
Eric
Re: 39' sloop conversion

 

Matt,
Not so sure you would be satisfied with a 12kW system.? Staying at 48v is safer but you would be better served with a motor that more closely matched the design criteria of the boat builder.? Your original diesel was likely about 30-35hp and if you want similar performance a 20kW motor would be a better match.? This is what our computer model suggests:

38ft displacement sailboat (LOA 39ft ¨C LWL 33ft (estimate) - displacement 18000lbs

  • Kts????????? Watt? (in calm seas)
  • 1.9???????? 28
  • 2.3???????? 48
  • 2.9???????? 96
  • 3.7???????? 192
  • 4.2???????? 288
  • 4.7???????? 384
  • 5.0???????? 480
  • 5.6???????? 672
  • 6.1???????? 816
  • 6.6???????? 10080? This is about the max performance of a 10kW motor - 90% of hull speed
  • 6.7???????? 11040
  • 6.9???????? 12000
  • 7.1???????? 12960
  • 7.3???????? 13920
  • 7.6???????? 15840
  • Hull speed?????????? 7.70
Mike
Electric Yacht
Re: Ten Socio-Emotional Benefits Of Sailing

 

Hi

I'm the 'owner' of the group.

This post and the person who posted it have been deleted.

Sorry it slipped through.

Jeff Butler
www.plugboats.com

On May 31, 2020, at 7:45 AM, Larry Brown <elcapitanbrown@...> wrote:

Anytime I see an outlier message like this that does not make sense that it would be posted to a forum I will not click on the link. Maybe it¡¯s software with ¡°somewhat¡± relevance that can go to multiple groups that is harmless just to get followers. As more people get used to following where the software takes them, the more we suckers get used to it. When they have enough people suckered in the next link will spread malware and possibly one of these ransomware POS groups. I would stick to threads that at least match the subject. Unfortunately these hackers will get so good you won¡¯t be able to detect them. IE custom messages crafted for subjects that apply to the forum. Of course I¡¯m highly unlikely to follow links anyway for this very reason. It¡¯s a bloody shame this is what the net turned into.
On May 30, 2020, at 11:16 AM, fred4936 via groups.io <fred4936@...> wrote:
Re: 39' sloop conversion

Scott Masterson
 

Matt,

There is one initial problem with your plan. Thunderstruck is not correct when they claim the ME1616 will produce 12kW continuous at 48V. The motor is a three phase AC motor. You will be lucky to make 9kW at 48VDC input power. The controller converts VDC to VAC which will result in a VAC of around 33V. The 250A rating of the ME1616 is the Arms rating. Expect around 8,250kW continuous power at 48VDC input power.

Next up is what your prop will be spinning at WOT. The voltage constant for the ME1616 is 0.026V/RPM. This means at 48V DC, the motor will spin around 1,800 RPM. With a 3:1 reduction, expect your prop to spin a maximum of 600 RPM. You may want to look into that too. I believe your 3GM30F turned out somewhere around 21kW at 3,200 RPM with a 2.2:1 ratio, turning the screw at 1,629 RPM. Let's see...going from 21kW at a prop speed of 1,629 to 8.25kW at around 600? Bottom line, expect your power to be cut back to a little over a third of what you had with the 3GM30F.

I suggest you consider a 96V system. That will pretty much fall right in.

I sell kits, as do others on the forum. If you would like a quote from me, feel free to email me. Understand the fact I sell kits doesn't mean I am using this forum as a platform to do so. I normally don't bother responding to most of the posts here unless I think someone is making a mistake and I think you are. It's about the math and misinformation.

Scott
Re: 39' sloop conversion

 

¿ªÔÆÌåÓý

I can tell you the max amperage you should get from the two charge controllers is 50amps. ?I have a 38¡¯ trimaran at 9k lbs with the same motor and am at the end of the install but the beginning of testing. ?I don¡¯t know the size of my prop but it¡¯s a two blade originally on a 30hp yanmar with a 2:1 reduction. ?I can only run about 3knts around 20 amps and 4 around 50. ?I¡¯ve only made one test run and am planning on doing some more. ?Someone on the list was advocating a 3:1 with a 4blade prop which I¡¯m about to price out. ?So the 3:1 is probably the right choice. ?I have less weight than you but more wetted surface so I¡¯m not sure how well we compare. ?And this was with very light wind on the beam.



On May 17, 2020, at 9:36 AM, MATT <msteverson@...> wrote:

?Hello all, I'm a longtime lurker, this is my first post, so please, be gentle.

We have lived on our 39' sloop for about 5 years now and are ready to convert to hybrid...this is the plan I've come up with and am looking for your critical analysis.

The boat is a custom build. It displaces about 18000 lbs all full, has a 3/4 length "scheel" keel, and only draws about 50".? We currently have a very good running yanmar 3gm30f that turns a 17" 2 blade max prop.? We've put in about 20k nm over the past few years and she solidly averages 6kts.? The engine is in the middle of the boat under the galley sink and makes A LOT of noise and stink and we're sick of it.? We've got a little extra time and money so we think this project could go a long way.

The plan
- 48V 12KW Thunderstuck ME1616 kit - currently its on backorder - with a 3:1 gear reduction
- About 15kw lithium battery bank (right now Thunderstruck has Valence 1.6kw batteries used for $350 each, so 8 of these, and the VC1 BMS they sell, I think would be easy to install and work well.)
- A 3.5-4kw diesel generator that is PURELY for recharging batteries using the thunderstruck TSM2500 kit with 2 chargers.? This should get me 70amps at 48volts running from 240VAC.? This is important because we live at anchor in the PNW year round.? We often have a long way to go with no wind, or sun and generally avoid marinas.? I will buy this used or rebuilt to save dollars.
- Run existing loads off of a DC-DC converter

- We have 500W of PV installed with 12V Victron charge controllers?that keeps up with our daily usage.? I would like to get them putting electrons into the 48v bank and?am wondering if there is a work-around with DC to DC converters or something so I don't have to buy all new CCs.??

I will be doing this install myself.? I'm confident with basic stuff like solar installs and alternators but this project will be a little out of my comfort range, I'm very much looking forward to it.? What is most important to me is to keep the system as simple and user friendly as possible mostly for resale purposes.??

Any advice/comments/questions/trashtalk would be appreciated.??

Matt

Re: 39' sloop conversion

 

Thanks James. That's what I hoped, and its great to have information from long term to bolster us newbies.

Rob


On Sun, 24 May 2020, 12:30 am James Sizemore, <james@...> wrote:
A cycle is generally a large draw down of your battery, under 20% to nearly full again. It takes many small draw downs to say 90% and back to nearly full again to equal one ¡°real¡± cycle.? As for If solar or A generator while under way, Is counting against your cycles. Probably not if no charging and or drawdown is happening, if your batteries are not gaining or losing any charge then the internal resistance is higher then the resistance of your loads, so all the power from solar is going directly to loads.? The battery really can not tell the difference between that and doing nothing. With the caveat that they would notice some fluctuations or ripples in the voltage. ?

Generally speaking it takes 100 of small draw downs and recharges to equal one cycle lost.? You are a probably losing more capacity to just plan calendar life lose then from cycle life lose is most situations with LiFePo4, when not doing large drawdowns to under 20% back to full, they maintain they Capacity very well. ?

My pack is now 10 years old, I have lived aboard for over eight years of there life using them as a house bank (many small drawdowns to say 90-85% daily, and have Cruised the last 2 years meaning large draw downs a couple of times a month when I switch anchorages/marines as I travel. Generally I only draw them down to a little less then 50% on most travel days.? But occasionally go down as far as 30%.? I like to keep plenty of reserve capacity incase things don¡¯t go well.? After 10 years, I have no measurable difference in there rated capacity.

What follows is ¡°internet theory¡± ?Some of that amazing lack of capacity lose may be do to Winston manufacturing ?there 1000ah cells with some reserve capacity. Meaning they may have Really been 1010 ah Cells originally.? Most cell manufacturers no longer under rate there cells anymore.? When large prismatic cells where new, they where a little over engineered for warranty purposes, but once the manufacturers had real word data on actual reliability they did less over engineering. ?

But either way my Winston LiFePo4 cells are still delivering like new performance ten years later. ?
Re: Time to re-power

 

Hi Larry,?

I have been following this thread and would be interested a 48 v battery system. My email is sgjertson@...?

On Fri, May 22, 2020, 7:42 AM L Schmitz via <terminalift=[email protected]> wrote:
I have an extra 500 ? ?3.2 v 90 ah?cylinders with??bms devices and chargers. We are using big prismatic cells ?for our next??high voltage battery project ? I could duplicate my 48 v lifepo4?set up and charge only material cost if you are interested ?I will get you some pictures. We are in San Diego?


Best regards,
Larry Schmitz



On Friday, May 22, 2020, 5:21 AM, Larry Brown <elcapitanbrown@...> wrote:

Mine is Thunderstruck too.? For your size boat you can go with air cooled but need to make sure to get and engine compartment fan to circulate air.? No more water intake to get clogged with sea grass or some idiot¡¯s shopping bag floating by as you motor.? One of the beauties of the system.? It should push you just fine.? I use a couple eu2000 generators as backup for long distance trips but for day trips where you need a couple hours at most you can get by on batteries.

Anyway, good luck. ?

Larry


On May 21, 2020, at 11:01 PM, Ryan Sweet <ryan@...> wrote:

?
Do you have a link for the batteries you had success with? There are so many on offer and it seems quite hard to find much info about each company except for the us based ones and those are all twice as expensive (I recognize that this is possibly for good reasons).?

On May 21, 2020, at 18:14, L Schmitz via <terminalift=[email protected]> wrote:

?
I have had good luck with my 10kw?thunderstruck kit too. First installed 4??agm?batteries ? 12v 220 ah.?Then after 2 years replaced with lifepo4. An excellent upgrade?I assembled 4 battery boxes with 3.2v 90ah cylinders. Each box 4P4S?Then installed an?ant bms for balancing. The monitor is very good??for checking your system. If you decide to assemble your own battery system invest in a Flir Heat sensor. The Flir connects to your I?phone. You aim it at your wiring assembly under load. It detects hot spot?areas of concern in your connections. Battery, contactor ,controller and motor connections. 48 v 360 ah gives plenty of run time at 40 to 90 amp load.?

Best regards,
Larry Schmitz



On Thursday, May 21, 2020, 4:16 PM, Reuben Trane via <rjtrane=[email protected]> wrote:

Go to and look at their kits. I purchased 2 ea for my 12m Power cat. For your needs a 5kW to 10kW motor should do the job. Hard part is figuring out the reduction. I chose 3:1 to get a max prop RPM of 800.

48Vdc woks best. If it¡¯s in your budget assemble a battery from LiFePo4 cells

Feel free to ask me about my installation.

Reuben
Re: Looking to Purchase an Electric Boat

 

¿ªÔÆÌåÓý

Please also CC me photos
I live in SW Florida on Callosahatchie River on a 400 mile canal system?


On May 20, 2020, at 9:44 PM, Glenn Holland <gholland1@...> wrote:

?What are your waters?? I have an electric propelled Redwing 18 Iaunch for sale..? If you give me an email, I've got plenty of photos.
Glenn Holland/NC
gholland1@...

-----------------------------------------

From: abners@...
To: [email protected]
Cc:
Sent: Wednesday May 20 2020 9:34:12PM
Subject: [electricboats] Looking to Purchase an Electric Boat

Hi, does anyone have any suggestions on where I can buy a used GOOD QUALITY electric boat for a good price?
Also open to hearing offers.
Thanks

Re: Heavy Weather Strategies When Sailing A Catamaran

Rob Hepler
 

¿ªÔÆÌåÓý

can someone block this spammers membership?


On May 8, 2020, at 12:31 AM, Faith Banini via <faithbanini@...> wrote:

By their nature, larger catamarans are exceptionally safe offshore. It is not unusual to sail through mildly uncomfortable conditions, such as a gale, only to arrive in port and hear sailors on keelboats talk of ¡°surviving¡± horrendous weather. A large modern catamaran has plenty of buoyancy and exceptional roll inertia. Together these make a capsize, or inversion, highly unlikely. A 30-foot breaking wave hitting a cat abeam will simply make the boat surf sideways.


Regardless, anyone venturing offshore in a multihull should be prepared to handle the worst.
Re: Ten Socio-Emotional Benefits Of Sailing

 

Anytime I see an outlier message like this that does not make sense that it would be posted to a forum I will not click on the link. Maybe it¡¯s software with ¡°somewhat¡± relevance that can go to multiple groups that is harmless just to get followers. As more people get used to following where the software takes them, the more we suckers get used to it. When they have enough people suckered in the next link will spread malware and possibly one of these ransomware POS groups. I would stick to threads that at least match the subject. Unfortunately these hackers will get so good you won¡¯t be able to detect them. IE custom messages crafted for subjects that apply to the forum. Of course I¡¯m highly unlikely to follow links anyway for this very reason. It¡¯s a bloody shame this is what the net turned into.

On May 30, 2020, at 11:16 AM, fred4936 via groups.io <fred4936@...> wrote:
Re: Ten Socio-Emotional Benefits Of Sailing

 

Good article!

On Saturday, May 30, 2020, 06:21:17 AM EDT, Faith Banini via groups.io <faithbanini@...> wrote:


?
There¡¯s something about sailing that makes it quite unlike other sports. More than just skill and strategy, it teaches certain values that shape sailors into the unique athletes that they are.
?
Yet, we¡¯re often so focused on the physical aspects of sailing that we forget how much we stand to gain from the sport ¨C both socially and emotionally. So here¡¯s a list of the top 10 socio-emotional benefits of sailing
?
Re: Ten Socio-Emotional Benefits Of Sailing

 

?I can¡¯t see how long Faith has been a member, but her messages have hit many of the boat related groups that I belong to. ?The groups are typically hit within a 5 minute window. ?The other groups hit are not particularly electric boat related.

Since every one of her messages is just about the included link, as far as I can tell, this is just trolling for clicks. ?It might be different if ¡°she¡± gave any information about her interest in our group, or made a post that was relevant to one of our topics.

Fair winds,
Eric
Re: Using online calculators - do they work?

 

Before I converted, I used to get estimated power at a variety of speeds for my boat, and I looked at two other electric boats for which I had actual data (3 points for one boat and just one for the other). In those cases, the real life boats used 2-3 times less power than the calculator predicted. I applied that factor to the estimated power for my boat, and later took note of the power it really consumed at various speeds. I found the adjusted estimate to be quite good, though the actual was more impacted by speed than the estimate.
Re: Using online calculators - do they work?

Bob Jennings
 

Props,? several years ago I put the info for my boat in the Vic Prop calculator.?
For a 3 bladed prop it spit out 14¡Á8.8. I put a used 3 bladed 14x10 on her, the 2 bladed 14¡Á11 that came with her was trash.? Last season I went with a 4 bladed 12¡Á12.5 meant for a wake board style boat. Looking at the Vic Prop recommendations to reduce diameter & increase pitch, I'm pretty spot on.??

Performance wise I feel the boat motors better with the smaller diameter prop. It has a ton of bite. Although I didn't pick up any additional speed at the same RPM's, the SOG remained?the same
& my wattage dropped. Depending on conditions at 3-3.5 knots, 700 watts. Between 3.5 -4 knots, 1500 watts. I also would like to try out a larger prop, 15" diameter just to see the difference.? I'm retired now so pretty sure my wife would have an issue with that....

One major difference running the wake board prop, I do get regen at speeds over 4 knots. It's not much, 55-100 watts but if you were crossing an ocean it would help.? That's all I know ?



On Mon, May 25, 2020, 12:49 PM Eric via <ewdysar=[email protected]> wrote:
On Mon, May 25, 2020 at 06:29 AM, Larry Brown wrote:
I Wonder if we can use an adjustment formula to his calculator to get a better ballpark for our motors.? Even though he could not come up with reasoning for the discrepancy did he sound interested in it as a challenge or was he just dismissive of us being outliers that represent such a small minority that it¡¯s not worth his time to work on?? Or did he seem like the kind of guy that enjoys a challenge and may, at this moment, be tinkering around to examine it and give additional inputs that would accommodate electric propulsion.
The conversation was in 2011 and I haven¡¯t heard anything since, so I¡¯m going to go with the ¡°minority¡± perspective...

Eric

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