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Propeller walk (also known as propeller effect, wheeling effect, paddle wheel effect, asymmetric thrust, asymmetric blade effect, transverse thrust, prop walk) is the term for a propeller's tendency to rotate about a vertical axis (also known as yaw motion). The rotation is in addition to the forward or backward acceleration.
The forward propeller stopped rotating but due to the nature of the failure the aft propeller kept turning, producing negative thrust. At this point the flight crew increased power to the remaining three engines but a problem with the RPM sensors on one of them led to automatic engine shut-off.
The clockwise-turning propeller is by far the most common. The yaw is noticeable when adding power, though it has additional causes including the spiral slipstream effect. In a fixed-wing aircraft, there is usually no way to adjust the angle of attack of the individual blades of the propellers, therefore the pilot must contend with P-factor and ...
On propeller aircraft, there is a difference in the remaining yawing moments after failure of the left or the right (outboard) engine when all propellers rotate in the same direction due to the P-factor. On turbojet and turbofan twin-engine aircraft, there usually is no difference between the yawing moments after failure of a left or right ...
The propeller problem is the second setback for the Royal Navy in less than three weeks, following a collision by two warships in a harbor in Bahrain, causing damage to the vessels but no injuries.
In a propeller aircraft, an overspeed will occur if the propeller, usually connected directly to the engine, is forced to turn too fast by high-speed airflow while the aircraft is in a dive, moves to a flat blade pitch in cruising flight due to a governor failure or feathering failure, or becomes decoupled from the engine.
Exploded, broke up, and crashed off the coast of Long Island 30 minutes after taking off from New York bound for Paris due to a catastrophic central fuel tank explosion resulting in the forward fuselage section, which included the main flight deck first class and a portion of business class, separating and causing the remaining section to climb ...
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related to: upward turning propeller problems symptoms