Human powered waterjet?

[Carlazzomark]

Can any of you technical types tell me if a human (leg) powered waterjet is feasible for small boats (10-16 ft)?

What kind of force, energy and rpms would be required? I know a lot of this depends on hull design, so let's assume a 12 foot catamaran with a drag of 20 pounds at 6 mph (top speed).

And would such a system be steerable at slow speed?

Any answers in simple English would be appreciated.

Thanks.

[CDK]

You might give it a try if your legs are very strong and you have to cover just a few hundred yards.

Jets are not the smartest way to move a watercraft: most power is wasted in a 25:1 chain or belt drive needed to obtain 2000+ rpm pump speed.

[Submarine Tom]

You'll get 400 watts maximum if you are strong and fit for anywhere from 45 seconds up to 5 or 10 minutes.

That will translate to less than 1/2 a horse power at the jet/prop.

-Tom

[Questor]

Purchase an electric motor and battery pack to drive the waterjet propulsion system. Rig up a 12 volt alternator or generator to a stationary 10 speed bicycle.Keep both of them discreetly in your garage so the neighbors don't think you're crazy. Start by training on the 10 speed charger hooked up to the battery pack in the boat at a comfortable pace for 1/2 half hour a day. Once weekly you should be able to take the boat for a little spin. The longer you stay with the system the stronger and healthier you'll become as you take your boat farther and farther each weekend.