fixed-pitch propeller

fixed-pitch propeller

A propeller whose blade angle at the section under consideration is fixed and cannot be changed. This kind of propeller is most efficient at only one air speed and RPM. Fixed-pitch propellers are generally made of wood.
References in periodicals archive ?
If we had an airplane engine turning a fixed-pitch propeller and equipped with both a tachometer and a manifold pressure gauge, each instrument's values would fall when reducing power from full throttle.
The R7 Ranger is different from many LSAs because it has an all-aluminum fuselage and interestingly, a 100-HP Continental O-200-D spinning a Catto fixed-pitch propeller. Where lots of other LSA models are powered by some kind of Rotax, Torode decided that the R7 had to have a small Continental even if means a weight penalty because he thinks it's iconic, easily serviced in the field and would be more accepted by flight schools and also older pilots.
The vessel has a propulsion arrangement based around a de-rated, tier three-compliant MAN B&W SG50ME-B9 two-stroke main engine driving a large-diameter, fixed-pitch propeller.
As engine horsepower increased post World War I, the wooden fixed-pitch propeller that operated efficiently only at its design speed was no longer enough.
The pivoting nacelle incorporates a large electric AC motor directly driving a fixed-pitch propeller. The motor is speed-controlled by a frequency converter, with full torque available in either direction from zero to nominal speed.
The aforementioned fixed-pitch propeller is a single piece of aluminum alloy or wood.
Even relatively simple airplanes, those with welded-down landing gear and a fixed-pitch propeller, can have complicated systems.
MAN Diesel & Turbo recently announced a strategic focus that added the Kappel design to its fixed-pitch propeller portfolio, both for newbuildings and as a retrofit solution to vessels already in service.
For example, the diameter of a fixed-pitch propeller is often large to favor low airspeed operation, while the blade size is small to favor higher airspeeds and faster turning at low airspeeds.
During Part 23 certification of general aviation and commuter aircraft, glide performance must be determined and AC 23-8C specifies that for a fixed-pitch propeller, "stalling the airplane to stop the propeller from windmilling is not an acceptable method of determining performance because the procedure could cause the average pilot to divert attention away from the primary flight task of gliding to a safe landing." Indeed.
Lately,MAN Diesel & Turbo has declared a strategic focus that added the Kappel design to its fixed-pitch propeller portfolio, both for newbuildings and as a retrofit solution to vessels already in service.
Check your airplane's Pilot's Operating Handbook (POH) for specific guidance but, in general, fixed-pitch propeller engines need to be leaned for maximum propeller speed at full throttle.

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