powered body board

I am currently working on a project where I am making an electrically powered body board,

I am going to be using 2 impellers. It will need to power the weight of 2 people through the water at, at least 5mph. I am only looking at a duration of 30 minutes and have already found two 500 watt motors (total 1000w) which will rotates at 4000rpm each for the required time.

Where I fall down is on choosing the impeller that will give me the required speed and knowing whether the RPM is adequate.

Any assistance would be so helpful and any impeller makers would be brilliant

Thank You

Sean

 

try connacting some diving scooter manufactuers
as that should be same type of thing

 

These are kinda cool. You could conver one to electric.

Sorry that's all the help I can be.

http://www.mokai.com/

http://www.surfango.com/index.htm