small yet torque engine

[noahnoah]

Could anyone make a recommendation on the type of motor and gearing I could use for a small personal watercraft<br />(very small Jetski).?<br /><br />looking for a very small internal combustion or electric engine

 

[Silvertip]

Re: small yet torque engine

I think a little more information is needed here. It would be nice to know exactly what you are starting with and what you are trying to accomplish.

 

[bayman]

Re: small yet torque engine

These types of things would help as a starting point:<br />- Hull type (like a jetski then?)<br />- Are we to assume this will plane?<br />- Jet or outboard with a prop<br />- What size exactly<br />- Keep in mind that you can't put much weight at all on something "very small". That limits the choice of engines, as does the safety factor. <br />- Don't plan on planing with an electric motor

 

[craze1cars]

Re: small yet torque engine

This sounds like a homemade project of some sort. As general advice, you'll generally get most bang for the buck with light weight out of a 2 stroke. At high rpms they put out a lot of HP per pound of weight. Examples: Chainsaw, snowmobile, or older dirtbike engines.<br /><br />You'll get more weight and less power, but more torque at lower RPMs from a 4 stroke lawnmower or street motorcycle type of engine.<br /><br />As for electric...how long is your extension cord? <br /><br />I agree we certainly need a LOT more details to make any specific recommendations (or to be more realistic...guesses.)<br /><br />And as for gearing? A specific ratio is likely not needed for a small project. A wide variety of gearing could be accomplished with the many sizes, types, and pitches of propellers that are available.<br /><br />Let us know what you're trying to do....this could be a lot of fun!