constant-speed propeller


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constant-speed propeller

[¦kän·stənt ¦spēd prə′pel·ər]
(aerospace engineering)
A variable-pitch propeller having a governor which automatically changes the pitch to maintain constant engine speed.

constant-speed propeller

constant-speed propellerclick for a larger image
A propeller in which the pitch is adjusted automatically, so that the propeller revolves at a given rate dictated by the pilot and remains at that rate irrespective of maneuvers or throttle position. The pitch of the propeller is altered suitably by a centrifugal governor, so that the original RPM is restored if there is any increase or decrease in RPM. A constant-speed propeller retains an efficient angle of attack over a wide forward speed range by altering the blade angle constantly. This type of propeller is used on multiengine aircraft if it is provided with full feathering capability.
References in periodicals archive ?
It had retractable landing gear, a constant-speed propeller, and hydraulic flaps and brakes.
"Unpressurised, and powered by a Textron-Lycoming 180hp piston engine driving a Hoffman three-bladed, constant-speed propeller, the Tutor can cruise at 130kts at sea level and climb to 5,000ft in seven minutes.
On multi-engine aircraft, this Hydromatic constant-speed propeller had the ability to "feather," stopping the propeller's rotation, to keep the propeller from windmilling after an engine failure.
For a constant-speed propeller, an overhaul consists of an initial visual inspection; disassembly; cleaning of all components that are not to be replaced; inspect, measure, conduct nondestructive testing, which may include dye penetrant, eddy current and/or magniflux; rework/refinish components to be reused; cadmium plate components with a corrosion risk; finish/paint components; replace hub studs, miscellaneous hardware, seals and gaskets; reassemble; balance; and bench test--set pitch angles and assure the blades match at all reference stations.
The diameter and blade size of a constant-speed propeller is often larger (than a fixed-pitch), due to the variability of blade angles."
The constant-speed propellers on typical personal airplanes allow infinite adjustment between their high-rpm and a low-rpm stops.
Constant-speed propellers keep eta at this efficiency level at pretty much all cruise speeds.
Hartzell Propeller has signed an agreement with Hawker Beechcraft to supply constant-speed propellers for the airframer's new piston and turboprop aircraft, including the Beechcraft G36 Bonanza, G58 Baron and the King Air C90GTX, B200GT and 350i.
The first is the "Golden Years." With the formation of NACA, groundbreaking aeronautical research led to the growth in the 1920s and 1930s of technical improvements such as constant-speed propellers and standardized airfoil sections.
Constant-speed propellers were a great thing to have, straightening us out before we hit a dry spot.
How about an article on constant-speed propellers? Why is it necessary to maintain constant speed?

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