Chapter 8

Question 1

Which components significantly contribute to forward speed damping, vertical speed
damping, and pitching damping?

Answer 1

Forward speed damping: Rotor Fuselage
Vertical speed damping: Rotor
Pitching: Horizontal tail

Question 2

Which components contribute to the velocity stability derivative and incidence stability
derivatives? Please also the direction (+/-) of these stability derivative

Answer 2

Velocity stability (positive means stable)
Rotor-> positive velocity stability derivative
Horizontal tail->If the horizontal tail pre-setting angle is positive, negative velocity
stability derivative. Otherwise, the positive velocity stability derivative
Incidence stability (negative means stable)
Rotor-> positive incidence stability derivative
Horizontal tail->Negative incidence stability

Question 3

What is the influence of the centre of gravity on the velocity stability derivatives and incidence
stability derivative

Answer 3

Changing the centre of gravity backwards will increase the amplitude of the velocity stability
and incidence stability derivatives. As the rotor provides unstable incidence stability, it would
lead the vehicle more unstable.