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In aviation
Aviation includes the activities surrounding mechanical flight and the aircraft industry. ''Aircraft'' includes fixed-wing and rotary-wing types, morphable wings, wing-less lifting bodies, as well as lighter-than-air craft such as hot ...
, a propeller strike, or prop strike, also called a sudden stoppage, is an accident in which an aircraft's propeller
A propeller (colloquially often called a screw if on a ship or an airscrew if on an aircraft) is a device with a rotating hub and radiating blades that are set at a pitch to form a helical spiral which, when rotated, exerts linear thrust upon ...
contacts any object and is forcibly stopped or slowed. Propeller strikes can be the result of the propeller contacting the ground due to landing gear
Landing gear is the undercarriage of an aircraft or spacecraft that is used for takeoff or landing. For aircraft it is generally needed for both. It was also formerly called ''alighting gear'' by some manufacturers, such as the Glenn L. Marti ...
collapse, failure to extend the landing gear, or nose-over. However, the term also includes the damage incurred from contacting any object, such as a hangar door, or even the sudden rpm loss from contacting a yielding substance such as water or heavy tall grass.
As well as damaging the propeller itself, a prop strike with the engine running can cause severe damage to the engine
An engine or motor is a machine designed to convert one or more forms of energy into mechanical energy.
Available energy sources include potential energy (e.g. energy of the Earth's gravitational field as exploited in hydroelectric power ...
and its connected accessories, such as the alternator
An alternator is an electrical generator that converts mechanical energy to electrical energy in the form of alternating current. For reasons of cost and simplicity, most alternators use a rotating magnetic field with a stationary armature.G ...
. An engine tear down and rebuild is usually recommended, otherwise there is a risk of an in-flight engine failure, broken crankshaft or loss of propeller.
See also
*Bird strike
A bird strike—sometimes called birdstrike, bird ingestion (for an engine), bird hit, or bird aircraft strike hazard (BASH)—is a collision between an airborne animal (usually a bird or bat) and a moving vehicle, usually an aircraft. The term ...
References
External links
Aviation risks {{aviation-stub