Vmc Flashcards
VMC Items Listed
Engine: Max Power, Critical Engine Inop, Critical Engine Wind, 5 degrees toward op engine
AIrframe: Sea Level, Most Unfavorable CG, Max SL T/O Weight, Ground Effect
Configuration: Trim T/O, Cowl T/O, Flaps T/O, Landing gear retracted
VMC Sea Level
Increases Vmc. The more air density = more thrust and more yaw
VMS Most Unfavorable CG
Aft. Increases Vmc because the more aft the CG the shorter the rudder arm and thus you have less rudder control.
VMC Max SL T/O Weight
Decreases Vmc. The heavier the aircraft, the harder it is to change it’s direction of travel and yaw it.
VMC Airplane Trimmed for T/O
Does not affect Vmc speed for us
VMC Flaps in T/O Position
Does not affect Vmc speed for us
VMC Cowl Flaps in T/O Position
Does not affect Vmc speed for us.
VMC T/O or Max Power in Op Engine
Increases Vmc speed because the more power, the more yaw towards the inop engine
VMC Airborne + Ground Effect
Increases Vmc speed because there is less drag so there’s more thrust in the operative engine.
VMC Landing Gear Retracted
Increases Vmc speed. The landing gear acts as a keel and precents the aircraft from yawing.
VMC Critical Engine Inop
Increases Vmc speed. The critical engine is the engine that makes it harder to control the aircraft when you lose because the thrust lever arm is closer to the centerline of the aircraft. The remaining engine has a larger arm bc of p-factor and can yaw towards the inop engine more powerfully
VMC Critical Engine Windmilling
Increases Vmc speed because the propeller is angled to take larger bites of air and thus is producing more drag
VMC Up to 5 degrees Op Engine
Decreases Vmc speed because you are counteracting the yaw of the operating engine, it is harder to fight the bank
