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Pedal : Bicycle
It is the main rotor of a helicopter that acts to lift and thrust the craft through the air. A link is provided below.
1) keyed propeller and
2) keyless propeller................... they have further classificaton
1.fixed pitch propeller
2.controllable pitch propeller
3.directional pitch propeller
How do you build a propeller
A propeller airplane is, simply put, any airplane which uses a propeller for propulsion.