Toy Boat Designs Without Motor Toy Motor-boat Help!?

Toy motor-boat help!? - toy boat designs without motor

Good day!
> What is the mini-quiz at school.
> Are we a mini-boot-do (in a design that we love and sizes), with a battery and a generator (or some other kind of mechanical device that serves as an engine powered).
> Go to run in a pool, and the fastest wins.
> What do you think the best materials that I use, and the engine? btw, a remote control device) can

PS
I have this idea that I will use a polystyrene, a small boat and power with a Tamiya Dynamo design and a 9-volt battery. Do you think that it works? suugestions all? Thank you!