That would be a shorter version of Scott Reeves' Third Wheel. https://www.mail-archive.com/hpv-boats@hupi.org/msg00084.html Pedal drive for 2...
Russ, Sounds like you had a good trip in Ontario. I ran Godzilla with 18.5', 500#, let it optimize draft and beam. It came back with 56...
Charlie, If you google search on SpinFin you'll see 14 3/4" between the sprocket axes which is for a 1/4" pitch chain. With a bicycle chain...
Russ, Welcome to the forum. I put your parameters into Godzilla (1500 lbs, 29.5 ft) and had it optimize at 6 MPH to generate a speed vs. power...
folding prop 640 RPM, 23.27" pitch (591 mm), 21.9 mm max width. Here is the prop info from JavaProp Diameter D 0.3556 m 14.00 in...
folding prop I attached pictures of the folding prop that I made. It is 14" diameter (356mm) by 23.3" pitch (591mm). The blades are stainless...
Nautibike The prop looks large and robust - for a rental boat it needs to be fairly rugged so it won't require frequent repairs. Their belt...
Flex shaft stiffness Andreas, The information you provided on your proposed gearing gives me a better idea on your approach. When I am...
Flex shaft stiffness Initially I used a 1/4" solid stainless steel drive shaft, 8' long with 1:5.3 gear ratio. I measured its compliance at 4.42...
For a low drag solo kayak a 12" prop can readily provide enough thrust. A larger boat like Tom the rower mentioned has more drag and benefits...
Porta, I found a view of the gears inside http://www.model-engineer.co.uk/forums/postings.asp?th=51063&p=2 There are high speed and low speed...
In the picture showing us getting ready to attach the ama - note that there are 2 akas and one ama. That places the center of the ama about 7...
Tom, I added three pictures of my amas. They are 24 feet long and 6 inches wide. The front 4 feet and rear 2 feet taper to a point. The middle...
A typical rotary lawn mover motor runs at about 3000 RPM. The transmission on a self propelled unit looks like about a 40:1 reduction to drive...
The right angle drill drive units have been tried before and discussed on this thread. See post 1236 - 1240. They are designed for high RPM and...
