multi flying in the DA42 Flashcards
What are the 3 assymetries when OEI
- lift
- drag
- thrust
what is the main control problem when OEI?
Yaw
what are the 3 factors affecting control OEI?
- speed
- drag on dead engine
- thrust on live engine
what are light twins not required to have by law in the event of an engine failure?
positive rate of climb
what is the purpose of a propellor?
to convert engine power into thrust
what is disc-ing?
when drag from the prop affects forward speed
what is the angle between the chord line and plane of rotation on a prop?
incidence angle
what is the angle between the chord line and the relative airflow?
angle of attack
what is the angle between the relative airflow and the plane of rotation?
angle of advance
what is propellor torque?
the combination of the drag vector and the lift opposed to the plane of rotation
where does lift act from the propellor?
at 90 degrees to the aerofoil. drag acts at 90 degrees to the lift
when will a propellor run at constant speed?
when propellor torque matches torque from the engine
what happens to AOA on a fixed pitch prop as forward speed increases?
AOA reduces
what is fixed on a fixed pitch prop?
angle of incidence
what is the most efficient prop AOA?
2-4 DEGREES
what happens to AOA as prop rotation speed increases?
AOA increases