POF Final PTSD Flashcards
What is the ideal gas law
P/density x T
How do you remember the ideal gas law
P/RhoTe (pirate)
What do you do for buffet onset boundary questions
M=0.80 is correct ANYTHING else isn’t
Equation for take off where downwash is least
1/2 wingspan x 3.28
Equation for landing where downwash is most
2 x wingspan x 3.28
When V is doubled what happens to parasite drag
Multiply by 4
Upon extension of a wing spoiler AOA is constant. What happens to Cd and Cl?
Cd increase
Cl decrease
What is lift caused by on the aileron
The lower pressure on the upper surface
What is total drag is 2 dimensional flow
PS2
What is total drag in 3 dimensional flow
PSI3
What does dihedral and anhedral do lateral stability
Dihedral increases it
Anhedral decreases it
How can aircraft always have positive longitudinal stability
CG must be ahead of the neutral point
Dorsal fin and ventral fin remember
DPP
VPN
What happens to stick force stability when on the aft limit
Lower and positive
What does SGA mean
Slipstream: on take off but tail on ground
Gyroscope: on rotation tail in the air
Assimetric: blade effect in air
Differentiate VMCG VMCA VMCL
VMCG: ground
VMCA: in the air
VMCL: landing
What is VMC the same as
VMCA
Induced drag is proportional to
Mass
Where is ground effect greatest
Wing tip
What will flaps do to CL MAX and AOA
CL MAX: increase
AOA: reduce
What will leading edge devices do to AOA and CL MAX
Increase both
What is the relationship between temp and LSS
Proportional
Above the tropopause what happens to TAS
Remains constant
What happens when an aircraft accelerates into the transonic speed
AOA decrease due to compressability
What happens in a climb above the tropopause
IAS decrease
What happens in a descent below the tropopause
TAS constant
What does LSS equation
38.95 x square root temp kelvin
To avoid exceeding MMO you must:
Stop flying IAS and fly mach
To avoid exceeding VMO you must:
Stop flying Mach and use IAS
Climb below tropopause what happens to CL
Increase
What does VB VC VD equal
VB= 66ft/sec
VC= 50ft/sec
VD= 25ft/sec
How to calculate load factor
Change in Cl x change in AOA= y
Y+old Cl= new Cl
New Cl/old Cl= n
What is Pitch angle
Longitudinal and horizon
What is bank angle
Lateral and horizontal
What is path angle
Speed vector and horizon
Where is AOA
Speed vector and longitudinal
What tendency will a cambered aerofoil have
Pitch down
When you have a trimmed aircraft with a forward CG, what will the controls feel like
Normal
What is stick force per g proportional to?
Altitude
What does a higher mass do to Mcrit
Lower Mcrit because of a greater AOA to maintain level flight
What does perpendicular link to
Cosine
If flying at a normal speed and you feel rumbling in the rudder what does it mean
Slack control links
What is load factor not affected by
Weight
Load factors of a aerobatic plane
+6, -3
Load factors of a utility plane
+4.4, -1.76
Load factors of a normal plane
+3.8, -1.52
Load factors of a transport plane
+2.5, -1
