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.
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Even relatively simple airplanes, those with welded-down landing gear and a fixed-pitch propeller, can have complicated systems.
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.
Rolls-Royce Naval Marine in Walpole, Massachusetts, manufactures variable pitch propellers for naval and commercial ships, and has the capability to design and manufacture state-of-the-art controllable-pitch and fixed-pitch propeller systems of the largest sizes and highest power requirements currently produced.
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.
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.
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.
My other realization involving carb ice involved the fact that, just because the tach reads in the green arc doesn't mean an engine driving a fixed-pitch propeller is turning at a high power setting.
In fixed-pitch propeller airplanes you'll need to lean for maximum propeller rpm, a challenging feat since prop speed may vary with changes in IAS or pitch attitude as well.

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