variable-pitch propeller


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variable-pitch propeller

[′ver·ē·ə·bəl ¦pich prə′pel·ər]
(engineering)
A controllable-pitch propeller whose blade angle may be adjusted to any angle between the low and high pitch limits.

variable-pitch propeller

A propeller whose pitch may be changed when the engine is operating. See feather (ii).
References in periodicals archive ?
Perseus will be powered by an unusual closed-cycle propulsion system that includes a liquid-cooled Norton rotary engine rated at 50 kilowatts, a two-speed reduction gearbox with provisions for clutching and locking the propeller, the stiff carbon-fiber driveshaft, the large variable-pitch propeller, storage tanks for liquid fuel and oxygen, and a condensor to cool the exhaust.
"We also have a dissertation project being undertaken, which is looking at variable-pitch propellers. The effect will be similar to changing gear on a bicycle, particularly important for our acceleration from complete standstill, enhancing our efficiency.
Because the E-2C uses variable-pitch propellers, with constant-engine rpm, a pitchlock limits power adjustments to rpm changes only, which is not how the system was designed.
Variable-pitch propellers were a vital ingredient of the "design revolution" of the 1930s that produced commercially viable airliners like the Douglas DC-3 and a host of high-performance military aircraft.

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