Recent content by Jordy Wells

I have noticed that "Boomer" sub propellers have designed somehwere between those of aircraft propellers and boat props. There is obviously some reason and advantage for this. What I am looking for is the most advantagious shape and size (in my case small diameter is better) to use as a low...

Is there a way to determine the diameter (or other dimension) differential between a propeller traveling an object through water as opposed to one traveling through air, the hp of the driving motor being equal in both cases?

If I have a soft base (mud or sand) and place 4 rocket balloons (long narrow ones used for twisting into shapes, animals, etc.) all inflated to the same pressure, but each balloon of a different diameter (1", 2", 3" and 4") and place platform (a thin, but rigid sheet of plastic) on top of the...