Exam Flashcards
1
Q
Vmax JET
A
Ta = Tr
2
Q
Max angle JET
A
Max excess thrust, L/D max, max glide
3
Q
Max ROC JET
A
Max excess power
4
Q
Max endurance JET
A
Min Tr, L/D max
5
Q
Max Range JET
A
Tangent line, best SR
6
Q
L/D max JET
A
Min Tr
7
Q
Vmax PROP
A
Pa = Pr
8
Q
Max angle PROP
A
Max excess power, near stall speed
9
Q
Max ROC PROP
A
Max excess power
10
Q
Max endurance PROP
A
Min HP required
11
Q
Max range PROP
A
tangent line, L/D max, max glide
12
Q
L/D max PROP
A
tangent line
13
Q
Acceleration
A
The change from intake to exit velocity per unit of time
14
Q
Q
A
Mass airflow (pAV - slugs/sec)
15
Q
V1 vs V2
A
V1 = intake velocity
V2 = exit velocity
16
Q
Jets
A
- Produce thrust directly from engine
- FF proportional to thrust output
- Each pound of drag requires a pound of thrust to offset it
- Tr = Drag
17
Q
Props
A
- Produce thrust directly from prop
- Result of BHP to SHP to prop modified by prop efficiency
- FF proportional to power output (engine)
18
Q
Specific fuel consumption
A
- Ct = fuel flow per pound of thrust
- Low Ct desirable
- Lowest values between 95-100% rpm (jet)
- SRmax = FF/Vmin
19
Q
Straight and level performance
A
- Unaccelerated = equilibrium
- Lift = Weight
- Thrust = Drag
- Max/slowest speed happens when Tr intersects Ta (both at high and low speeds)
- Vmax dependent upon throttle setting (Ta)
20
Q
AOC JET
A
Max climb angle occurs as (Ta-Tr)max
- L/D for jets
21
Q
L/D max
A
Where induced drag and parasite drag are equal
