Multi Engine Study Guide Flashcards
What is climb performance dependent on?
Excess power needed to overcome drag
Climb performance is significantly affected by the relationship between available power and drag.
What percentage of Power & Performance is lost when you lose an engine in a multi-engine aircraft?
It loses 50% of Power and 80% of Performance
What must an increase in drag be offset by?
Additional power
This additional power is taken from the excess power, impacting climb performance.
What are the two key actions to achieve optimum single engine climb performance?
- Maximizing thrust - full power
- Minimizing drag - flaps & gear up, feather prop
These actions enhance the aircraft’s performance after an engine loss.
Impact on Climb FPM
- Critical engine inoperative
- Wind-milling propeller
- Landing gear extended for the DA42?
-600 fpm
Impact on Climb FPM
- Flaps LDG
-600 fpm
Impact on Climb FPM
- Flaps APP
-400 fpm
Impact on Climb FPM
- Landing Gear Extended
-300 fpm
Impact on Climb FPM
- Critical engine inoperative
- Wind-milling propeller
-300 fpm
What is a twin engine aircraft with both propellers rotating in the same direction called?
A conventional twin
What effect do the same left-turning tendencies of a single engine airplane have on a multi-engine airplane?
They affect the multi-engine airplane similarly
What is the purpose of counter-rotating propellers in multi-engine airplanes?
To help combat left-turning tendencies
How do counter-rotating propellers affect p-factor and torque?
They cancel each other out
What is the result of using counter-rotating propellers in terms of rudder usage?
Less rudder is needed to oppose left-turning tendencies
Fill in the blank: A conventional twin aircraft has both propellers rotating _______.
the same direction
True or False: Counter-rotating propellers are designed to increase the amount of rudder needed.
False
What are the three main changes that occur when an engine fails?
Changes occur in Yaw, Roll, and to a lesser extent, Pitch.
What direction will an aircraft yaw and roll towards when an engine fails?
Towards the dead engine.
What causes the aircraft to roll towards the dead engine?
Loss of accelerated propwash and lift.
What happens along the Longitudinal Axis when an engine fails?
The aircraft will roll toward the dead engine due to loss of accelerated propwash.