Boating is a popular recreational activity, and it could also be used as a form of transportation for moving between coastal and river areas. Since we often don't see a boat's method of propulsion and ...

Using two propellers spinning in opposite directions, the genius contra-rotating propeller system is used on marine vessels in addition to planes.

Hartzell Propeller received an FAA STC for a new three-blade Polaris composite propeller designed to replace the standard propeller on Diamond DA40 NG aircraft with Austro Engine E4-A. The Polaris ...