VMC Factors Flashcards
Weight Increase
Vmc Decrease - Larger weight
component in horizontal
direction.
Performance Decrease
Aft CG
Vmc Increase - Rudder becomes less effective.
Performance Increase - Lower stall speed and higher cruise
speed.
Power Increase
Vmc Increase - Creates a greater rolling and yawing moment.
Performance Increase
Flaps Extended in Landing
Configuration
Vmc Decrease - Operating
engine creates more induced
airflow over the wing which
creates more lift, resulting in
more induced drag that
counteracts turning tendency.
Performance Decrease - Flaps increase drag.
Gear Extended
Vmc Decrease - Creates stabilizing effect.
Performance Decrease - Increases drag.
Windmilling Prop
Vmc Increase - Increases drag
due to propeller’s higher pitch
when feathered.
Performance Decrease - Increases drag.
Density Altitude Increase
Vmc Decrease - Engine produces less power resulting in less rudder required.
Performance Decrease - Less power available.
Sideslip
Vmc Increase - Airflow strikes
the rudder at a smaller angle,
vertical stabilizer blocks some
airflow. Relative wind strikes
vertical stabilizer from the side
pushing towards dead engine.
Performance Decrease - Increases drag.
Temperature Increase
Vmc Decrease - Engine produces less power resulting in less rudder required.
Performance Decrease- Less power available.
Cowl Flaps Open
Vmc Decrease - Small stabilizing effect.
Performance Decrease - Increases drag.
Critical Engine Inoperative
Vmc Increase - See critical
engine factors (PAST)
Performance Decrease - More drag due to greater rudder
deflection required.
Flaps in Takeoff Configuration
Vmc Increase - Operating engine
creates more induced airflow,
which creates more lift causing
the airplane to roll to the dead
engine.
Performance Increase?
List the VMC factors (12)
Weight
CG
Cowl Flaps
Gear
Takeoff Flaps
Landing Flaps
Windmilling Prop
Power
Critical Engine Failed
Density Altitude
Temperature
