Performance V

Question 1

For our takeoff analysis, we assume acceleration is _____.

Answer 1

Finite

Question 2

Where does the rolling takeoff resistive force come from?

Answer 2

The friction between the tires and the ground.

Question 3

When the aircraft is flying close to the ground there is an effective change in the _____, which in turn reduces the ____ drag.

Answer 3

downwash

induced

Question 4

Why does ground effect occur? How does it relate to a geometric aircraft phenomenon.

Answer 4

Near the ground, wing tip vortices interact with the surface and move outward wrt their normal positions.
This increases the effective aspect ratio which is inversely proportional to induced drag.

Question 5

In order to assure a margin of safety the lift off velocity is typically increased by ____ above the stalling velocity.

Answer 5

20%

Question 6

If you double the takeoff weight, the required take off distance ______.

Answer 6

Quadruples

Question 7

The FAA specified climb altitude after takeoff for jets is _____. For all other its ______.

Answer 7

35 ft

50 ft

Question 8

What is V_MC? Why is it important?

Answer 8

Minimum unstick speed

It describes the asymmetric rudder trim limitations

Question 9

What is V_MU? Describe it.

Answer 9

Minimum unstick speed
The unstick speed is the aircraft speed at which the airplane no longer ‘sticks’ to the runway and lifts off whether the pilot wants it to or not.