Radio Joe, hi there, wow it's been a long time since I was here but that's because Ive been busy with a new project.
My boat is pedals that drive a chain that turn an old grinder gear cogs that turns a shaft that drives a propeller. It's actually very easy to pedal and I could have probably given it a bit more had I known. But as it is it's fine an can easily be pedalled even by one kid on his own (if ever the situation arose)
One pedal rotation turns the propeller 9 times. It travels at about walking speed which is all I need!
Sorry it took so long to get back to you. UM