Performance VIII - X Flashcards
For most airplanes, the approach angle is ___ degrees.
Three.
Lect. 8
Why is the airplane assumed to roll freely at least for a few seconds just after a touchdown? How long (generally) for both large and small aircraft.
To decrease speed before the brakes are applied.
Small ~ 1 sec
Big ~ 3 sec
Lect. 8
What are the conventional braking devices available on an airplane?
- Mechanical brakes
- Deployed spoiler
- Drogue chutes
- Thrust reversers
Lect. 8
For a highly maneuverable aircraft, what two characteristics are necessary?
- The smallest turn radius.
- The largest possible turn rate.
Lect. 9
To obtain the highest maneuverability, the load factor and velocity must be ___.
- The load factor must be as high as possible.
- The Velocity must be as low as possible.
Lect. 9
What is the relationship between wing loading and turn radii/rates?
For a lower wing loading you have:
1. Smaller turning radii
2. Larger turn rates
(everything else being equal)
Lect. 9
For light, GA aircraft, wing loading is primarily set in the design stage by ____.
Stall speed requirements.
Lect. 9
When will turn the turn radius (R) and the turn rate (omega bar) be at a maximum?
When C_L and n (load factor) are at a maximum.
Lect. 9
At low speeds, the max load factor is a function of _____.
C_L_max
Lect. 9
At high speeds, the max load factor is limited by _____.
The structural limits of the aircraft.
Lect. 9
The total energy of the aircraft is the sum of ____.
KE and PE
Lect. 10
The weight normalized total energy is called the ___-of the aircraft.
Energy height.
Lect. 10
In terms of thrust, drag, and weight, how is specific excess power defined?
(TV - DV)/W
Lect. 10
What is the relation between specific excess power and the energy height of an aircraft?
Ps = dHe/dt
Lect. 10
How can an aircraft change its energy state?
By the application of excess power.
Lect. 10
