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...
Hi Tom, When I started the preliminary design for my boat I started making decisions on what it would do. It had to be capable of being...
You can see my other pedal powered boats videos on youtube if you search on "runbikepaddledave" Enjoy! ;)
Tom, I understand now that you need an axle to mount the cranks. The drive assembly for a shaft drive bicycle may work in your application....
1:1 ratio Since you are running a 1:1 ratio have you considered skipping the gear box and using a double universal joint instead? See...
prop efficiency Efficiency in the 85 to 88% range is possible for a prop operating at its designed speed and load....
