Ducted fan
A ducted fan is a propulsion arrangement whereby a mechanical fan, which is a type of propeller, is mounted within a cylindrical shroud or duct. The duct reduces losses in thrust from the tips of the props, and varying…
Propfan
A propfan or open rotor engine is a type of aircraft engine related in concept to both the turboprop and turbofan, but distinct from both. The European Aviation Safety Agency (EASA) defines it as "A turbine engine featuring contra rotating fan stages…
Aircraft fans
A fan is a propeller with a large number of blades. A fan therefore produces a lot of thrust for a given diameter but the closeness of the blades means…
Contra-rotating propeller
Contra-rotating propellers of a modified North American P-51 Mustang fitted with a Rolls-Royce Griffon engine. A contra-rotating propeller or contra-prop places two counter-rotating propellers on concentric drive shafts so that one sits immediately 'downstream'…
Counter-rotating propellers
Counter-rotating propellers are sometimes used on twin-, and other multi-engine, propeller-driven aircraft. The propellers of these wing-mounted engines turn in opposite directions from those on the other wing. Generally, the…
Varying pitch
The purpose of varying pitch angle is to maintain an optimal angle of attack for the propeller blades, giving maximum efficiency throughout the flight regime. Variable pitch Cut-away view of…
Theory and design of aircraft propellers
A well-designed propeller typically has an efficiency of around 80% when operating in the best regime. The efficiency of the propeller is influenced by the angle of attack (α). This…
Propeller History
The earliest references for vertical flight came from China. Since around 400 BC,Chinese children have played with bamboo flying toys.This bamboo-copter is spun by rolling a stick attached to a rotor between ones hands.…
Propeller – aeronautics
An aircraft propeller, or airscrew, converts rotary motion from an engine or other mechanical power source, to provide propulsive force. It comprises a rotating power-driven hub, to which are attached several radial airfoil-section blades such that the whole…
Hydromatic Propellers
Basic Operation Principles :The pitch changing mechanism of hydromatic propeller is a mechanical-hydraulic system in which hydraulic forces acting upon a piston are transformed into mechanical forces acting upon the blades. Piston movement…
