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What is a Critical Engine
This engine would most adversely affect the performance of the airplane if it were to fail.
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Vmc
minimum controllable airspeed, minimum speed at which the aircraft is directionally controllable
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COMBATSGG
Critical Engine Failed, Operating Engine Takeoff Power, Most Unfavorable Weight, Bank less than 5 degrees, Aft CG, Takeoff Configuration, Sea level conditions, Ground Effect, Gear Up
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Critical Engine Failed Factors Affecting Airplane
Torque, P-Factor, Accelerated Slipstream, Spiraling Slipstream
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Critical Engine Failed Torque Factor
Due to the direction of rotation of the props a yawing tendency occurs when the left engine fails, making it the critical engine
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Critical Engine Failed P-factor
Operating right-hand engine will produce a more severe yaw towards the dead engine due to the direction of rotation of the props. More "bite" from downward blade which is further from the center of the aircraft.
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Critical Engine Accelerated Slip Stream
Due to accelerated air over the wing it causes greater lift and a rolling tendency.
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Critical Engine Spiraling Slipstream
Left Engine Critical, The airflow from the left engine is moving around the aircraft and pushing on the rudder causing a yaw to the left. Right engine has no effect.
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Most Unfavorable Weight Factor
Light is unfavorable. An increase in weight causes Vmc to decrease because of the greater horizontal component of lift. With a greater horizontal component of lift (max 5 degrees) less rudder is required thus decreasing Vmc.
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Critical Engine Factor Bank up to 5 Degrees
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