Another school project.
I designed it by myself, and it goes fast on water but it doesn't move on the floor.
It uses spinning direction switch,one motor (not geared) and a 2x 1,5v batteries (AA).
Speed is 0,5m/s on water and it's fourth fastest hydrocopter in our little champions.
I only have to glue the switch to the body and that's it!
I have some drawings of this in the school and tell me if you like to see them!