Aerodynamics exam 3 Flashcards
When does pitch control airspeed?
When power is not available
Design phases (3)
Essay
—Conceptual phase (where to place power plant, landing gear, etc)
—Preliminary design (configuration)
—Detail design (supporting structure)
List problems when landing in heavy rain
Essay
1) rain momentum is down and back
2) rain film on aircraft increases weight
3) rain film is roughed by falling rain drops causing a decrease in aerodynamic Efficiency
4) rain drops hit the aircraft in an uneven pattern causing pitching and rolling
List problems when reaching force divergence Mach #
Essay
1) increase CD
2) decrease in CL
3) change in pitching moment as CP (center of pressure) changes
Benefits of swept wing in supersonic flight
Essay
1) raises Mach crit
2) reduces amount of CD increase
3) wing is within Mach cone
Sir George cailey
Concept of rigid wing
Which wing design has the least induced drag?
Elliptical
Why are balloons aero static vehicles?
Because they rise in still air
Aircraft certified under part 25?
Military Aircraft are not certified under part 25
Parts included in parasite drag
Essay
- leakage
- form
- adverse flow
Adverse flow?
Adverse pressure gradient
How does load factor affect stall speed?
Square root of load factor x stall speed = new stall speed
Most common prop on modern complex aircraft?
Constant speed
Formula TOD (pressurized)
3 times altitude
6 times groundspeed
Unpressurized—-
No more than 500FPM
SHP
On turbine aircraft
