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Not SAGPA approved The following is my attempt to assemble information from all sources and to combine it into a useful document. Please feel free to comment, change, fix, repudiate, teach by adding value to the document for everyone’s benefit. Mail me to have the base document changed – lenk@ehr.co.za

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Variable Pitch Propellers Four common types of propeller Fixed pitch Ground adjustable In flight adjustable Constant speed The last two are both examples of variable pitch propellers.

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History of Variable Pitch Propeller On 7 February 1922 Wallace Rupert Turnbull patented the Variable Pitch Propeller. Considered one of the most important developments in the history of aviation, this mechanism allowed for change in blade pitch to suit flying conditions and airplane weight. When Turnbull was posthumously inducted into the Canadian Aviation Hall of Fame in 1977, his citation read: "The patient application of his aeronautical theses to a number of problems unique to flight, and more especially his invention of the successful variable pitch propeller, have been of outstanding benefit to aviation."

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Variable Pitch // Constant Speed Propeller A variable pitch propeller (VPP) or controllable pitch propeller (CPP) is a special type of propeller with blades that can be rotated around their long axis to change their pitch – manual transmission in a car. A constant speed propeller (CSP) is a type of propeller that can change its blade pitch automatically to take better advantage of the power supplied by an engine in much the same way that an automatic transmission in a car takes better advantage of its power source.

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Basic Mechanism

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Airspeed // Pitch

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Control

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WARNING! Engine overspeed Danger! If no governor or governor settings inop. Watch MAP & Engine RPM closely Always set CLIMB pitch on final approach in case of a go-round Keep Aircraft speed in mind when adjusting pitch

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TIPS! Excessive manifold pressure raises the cylinder compression pressure, resulting in high stresses within the engine. Excessive pressure also produces high engine temperatures. A combination of high manifold pressure and low r.p.m. can induce damaging detonation. In order to avoid these situations, the following sequence should be followed when making power changes. When increasing power, increase the r.p.m. first, and then the manifold pressure. When decreasing power, decrease the manifold pressure first, and then decrease the r.p.m.