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44 ft catamaran Max prop easy18 in diameter 4 blade pitch is adjustable 16 to 24 degrees 72 volt 18 kw motor, max RPM 2500 Reductions =90-tooth bottom?pulley 28-tooth?top pulley = 3.21:1 ratio

Myles, The drag expert for my boat is Rick Willoughby from Australia. He's the holder of the human speed pedal boat record and the designer of the drive 80% of the R2AK used. I consulted with him on

Any suggested size pitch for a 24v ??Thx

The only time and situation I’ve seen people use model airplane props for hydro propulsion was for pedal powered kayaks on Vancouver Island back in 1996. The homemade propulsion units were based on

I first did some boat speed and electrical power measurements using the stock prop that came with the motor, to get a performance baseline. I read an article that said prop efficiency increases with

I would love to know how much speed you get from that prop. From the literature I have read and the theory that eprop borrowed from torq. Is the 6 is still only designed for the same top end speed as

Has anybody tried or know how to pick a model airplane prop for electric outboard?Thx

I went with the Navy 6, even though it's a bit big for my skiff, because it offered both high torque and high pitch 3 blade prop options. I would have preferred the lighter/less expensive Navy 3, but

Steve, I think a lot of it has to do with location. St Thomas tends to collect a lot of ruined boats, dreams, and peeps! Guys get a boat in the states, load up the significant other and head out. A

Matt, Yes the boat is very efficient. Craig Clos in Australia designed it. He's a retired guy whose hobby is hydrodynamics. He recently finished an 8 meter long cabin cruiser with all the amenities

Thanks I will look into themSent from my Bell Samsung device over Canada's largest network.

For a small, easily driven boat, look at APC props. They produce mostly for the R/C airplane market, but have also started producing marine props for human-propelled boats (used by some R2AK

Ray motors are old design but I find them very reliable. I have a 60V on a 24 ft pontoon. Years without any trouble. I would do a 48V next time though. Harry M wrote:

I looked into elco eprop and torqueedo. I went with eprop but have not been able to use it yet.I went with the navy 30 which is more than I need for my little trimaran.Do we know anyone custom

That’s interesting about all the inoperative torqueedos. I’d be interested to hear what the failures are. They are pretty highly regarded from what I’ve seen. Also interested to hear why the

Update: I’m excited. I just placed an order for new brushes for my original ETEK motor. Found that Thunderstruck has them again. We’ll see if they fit. Sent: Monday, October 31, 2022 11:46 AM To:

On the PM brush motors similar to the ETEK, this is a decent read: A Short Primer on the History of the Etek Motor, and Other Tales | The Electric Chronicles: Power in Flux (wordpress.com)

Hi Jerry, Did you say what kind of boat you have? 10 knots at 700 watts sounds like a dream. I imagine 700 watts is the propulsive power At the prop? So motor watts will be something like 1200? Matt

Miles and F Neil, Thanks for the info. For the 12 foot dinghy I have a 1.2 kw Hang Kai, which like the Elco is a gas lower end modification. Small prop. I've looked around St Thomas at what people

I can’t imagine that the drive efficiency loss thru the “90 degree turn from drive shaft to prop” amounts to much. The big loss is in using a small prop. My outboard conversion has served me