Propeller is a type of fan that transmits power by converting rotational motion into thrust. Difference pressure produced between the forward and back surfaces of the airfoil-shaped blade, is accelerated behind the blade. Propeller dynamics, like those of aircraft wings, can be modelled by either or both Bernoulli's principle and Newton's third law. Propellers are: Two-Blades, Three-Blades, Folding Props etc. We have many categories e.g. -Slow Fly, Electric, Direct Drive, Folding, Nitro or Gas Powered, etc.