controllable-pitch propeller

[kən¦trōl·ə·bəl ′pich prə′pel·ər]

(mechanical engineering)

An aircraft or ship propeller in which the pitch of the blades can be changed while the propeller is in motion; five types used for aircraft are two-position, variable-pitch, constant-speed, feathering, and reversible-pitch. Abbreviated CP propeller.

controllable-pitch propeller

A propeller whose pitch can be altered by the pilot in flight. Unlike in a constant-speed propeller, where the governor automatically controls the pitch, here the pilot carries out the pitch adjustments. Takeoff is made with a low blade angle, so that the engine develops maximum power. The blade angle is increased during cruise, so that the engine operates at a slower and more economical speed.

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As discussed in our June 2018 issue, the FAA earlier this year changed its policy to no longer require a complex airplane--one with controllable-pitch propeller, flaps and retractable landing gear--for the commercial pilot-airplane or flight instructor-airplane certificates.

FAA Reforms Several Flight Training Rules: Agency removes instructor requirement when using ATDs for instrument currency and addresses complex airplane availability, among other certification and reforms

The company won the Collier Trophy in 1933 for a controllable-pitch propeller patented in 1927.

Four "Caterpillars" and a funeral documents on the crash of the Huff-Daland XLB-5

Less than a month after the April 4, 2018, fatal crash of a Piper Arrow during a commercial-pilot checkride, the FAA has changed its policy to no longer require a complex airplane (one with controllable-pitch propeller, flaps and retractable landing gear) for the commercial pilot-airplane or flight instructor-airplane certificates.

FAA Rolls Back Complex Airplane Checkride Rule: There aren't enough single-engine retracts anymore

For each vessel Wartsila will deliver a Wartsila 32 main engine, a reduction gearbox, a Lips controllable-pitch propeller and a Lips transverse tunnel thruster.

Wartsila wins order for two propulsion plants

The other three tugs use controllable-pitch propellers with twin azimuthing drives.

Tanker escorts for Valdez and Cook Inlet: strikingly different measures in place

The workshop will provide reconditioning services to owners and operators of marine engines, gearboxes, controllable-pitch propellers, thrusters and other ship equipment.

Wartsila Corporation opens new workshop in China

The propulsion engine output is transmitted via reduction gears with hydraulic clutches to the controllable-pitch propellers. The reduction gears have two ratios, one for high and one for low speeds.

The resurgence of the ocean liner

In airplanes with controllable-pitch propellers, reducing propeller speed is an essential part of attaining best glide performance.

Making the field: planning a dead-stick approach works a lot better, when you employ the "key position" concept for turns and other decisions

The vessels would each have a fully-redundant propulsion plant with two Wartsila 8L32 diesel engines, each driving Lips 4CF13 feathering controllable-pitch propellers through a Wartsila SCV95-P58 reduction gearbox.

Wartsila Corporation wins order to supply two propulsion plants

Less apparent but still critical to maximum performance are things like good rudder coordination, retracting cowl flaps ("cooling drag" from excess air flowing across cylinders and engine components greatly increase drag) and--very important--propeller speed with controllable-pitch propellers.

From denial to final, II: things to do once you shake of the initial shock of an engine failure include nailing the best-glide airspeed, configuring the airplane and finding a place to land

In airplanes with controllable-pitch propellers, know the expected manifold pressure and rpm at take-off power.

Takeoff aborts: the properly prepared takeoff is spring-loaded to turn into an abort. Here's how to decide when to call the whole thing off