Performance and Limitations Flashcards
What are the effects of a forward CG?
Higher stall speed: aircraft has to fly at a higher AOA for level flight. Closer to Critical AOA.
Easier Stall Recovery: Nose naturally wants to fall forward.
Slower Cruise: Higher AOA means more life and more drag.
Less Range: Slower Cruise
Generally more stable: Higher AOA means more wing contribution to stability.
What are the effects of an aft CG?
Slower Stall Speed: Lower AOA means further from critical AOA
Harder Stall Recovery: nose does not want to naturally fall forward.
Faster Cruise Speed: Lower AOA means less drag
More Range: Faster Cruise
Generally Less stable: Lower AOA means less wing contribution.
What are the Load Factor Limits for the PA-44 180? and where can you find them?
Positive: Flaps up is 3.8G, Flaps Down is 2G
Negative: No inverted flight approved
Find them in POH Section 2
What are the Load Limits in general? and where do you find them?
FAR 23.337
Normal Category: Positive is 3.8G, Negative is -1.52G
Utility Category: Positive is 4.4G, Negative is -1.76G.
What are the effects of density altitude on performance?
Hot, Humid, High all decrease the density of the air.
Decreased power: Engine takes in less air
Decreased Thrust: propellers are less efficient in the thinner air
Decreased Lift: because airflow over the wings exert less force
increased ground roll, poor climb rate, longer take off and landing distances.
What are the PA-44 180 drag factors?
Gear down/Flaps up: -250fpm
Gear down/Flaps 25: -490fpm
Gear down/ flaps full: -525fpm
Inop engine prop windmilling/ gear and flaps up: -200fpm