Questions on Control Balancing

Question 1

Examples of aerodynamic balancing of control surfaces are:

a) spring tab, servo tab, and power assisted control
b) balance tab, horn balance, and mass balance
c) mass in the nose of the control surface, horn balance and mass balance
d) servo tab, spring tab, seal between the wing trailing edge and the leading edge of control surface

Answer 1

Correct: Option (d)

Question 2

Which statement about a primary control surface controlled by a servo tab, is correct?

a) The position is undetermined during taxiing, in particular with tailwind
b) The servo tab can also be used as a trimtab
c) Due to the effectiveness of the servo tab the control surface area can be smaller
d) The control effectiveness of the primary surface is increased by servo tab deflection

Answer 2

Option A is corerct. Source (http://www.atpforum.eu/showthread.php?t=5869)

Question 3

Which of the following devices is used to provide aerodynamic balance?

a) trim tab
b) anti-balance tab

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Answer 3

(b) Is the correct answer as the trim tab only sets the null point. However an anti-balance tab provides “Negative” balance