Vspeeds Technical

Question 1

What will be the effect if an engine failure were to occur below Vmcg?

Answer 1

Vmcg is the minimum controllable speed on the ground, where aerodynamic control is still sufficient to control the aircraft.

If an engine failure were to occur below this speed, maintaining directional control using aerodynamic control surfaces will not be possible.

Question 2

Does the required Vmcg speed increase or decrease with higher air density?

Answer 2

Since the thrust moment will be greater due to the increased air density, the required rudder control will also increase. Thus, to have more air flowing over the rudder to accommodate for this increased yaw moment, Vmcg will have to be increased.

Question 3

For SACAA exam purposes, the factors affecting Vmca is the same as?

Answer 3

Those that affect Vmcg

Question 4

V1 can not be greater than?

Answer 4

Vmbe and Vr

Question 5

V1 can not be less than?

Answer 5

Vmcg

Question 6

Vr may not be less than?

Answer 6

V1

Question 7

Vr may not be less than?

Answer 7

105% Vmcg

Question 8

Vr must allow V2 to be reached?

Answer 8

Before the screen height of 35ft, or 50ft for other non-class A aircraft.

Question 9

The screen height is found?

Answer 9

At the end of the TODR

Question 10

V2 must be __ higher than V__

Answer 10

V2 must be 10% higher than Vmca

Question 11

V2 must be __ faster than the Vso

Answer 11

V2 must be 20% faster than the stall speed

Question 12

V2 should not be less than?

Answer 12

V2min

Question 13

V2min may not be less than?

Answer 13

1. 1 Vmc
2. 13 Vsr

For 4 engined turbo props and jets,

1.08 Vsr

Question 14

Vref is?

Answer 14

1.3 Vso