10. Performance

Question 1

The most critical conditions of take-off performance are the result of some combination of high gross weight, altitude, Temp, and ?

Answer 1

Unfavorable wind

Question 2

Density altitude calculations

Answer 2

1. correct altitude with barometric pressure deviation from 29.92
2. pick point where new pressure altitude and temp meet
3. go horizontally to density altitude

Question 3

The best speed to use for a glide is one that will result in the greatest glide distance for a given amount of ?

Answer 3

Altitude

Question 4

Glide ratio = 30:1. How many NM will it go losing 2000 ft?

Answer 4

30 x 2000 = 60,000 ft 60,000 / 6000 = 10 NM

Question 5

60 mph (statute miles) = ? ft/sec

Answer 5

88 ft/sec

Question 6

How many feet will a glider sink in 10 NM if the L/D = 23?

Answer 6

2600’

Question 7

A to B = 15 miles B to C = 20 miles 20 mph tail wind
L/D = 20 Airspeed = 40 mph
What altitude is needed a B to arrive at C at 800’ AGL?

Answer 7

Effective L/D = (Ground speed / airspeed) x (L/D)
(60 / 40) x 20 = 30
(20 m x 5280 ft/m) = 105,600 ft
105,600 / 30 = 3520
3520 + 800 = 4320

Question 8

L/D = 23 :1 Loss in 8 NM

Answer 8

8 x 6000 = 48,000
48,000 / 23 = 2086

Question 9

At high elevation airports the pilot should know that indicated airspeed will be ? in relation to ground speed

Answer 9

Airspeed will be unchanged but ground speed will be faster

Question 10

If a flight is made from an area of high pressure to low pressure without the altimeter setting being changed, the altimeter will indicate?

Answer 10

An altitude that is higher than actual.