Example 6.2
A conventional tail-aft flying model aircraft has the following characteristics:
WING TAIL AIRPLANE
S = 0.8 ft Stail = 0.33 ft xac = 0.1 ft
c = 0.4 ft ctail = 0.33 ft xcg = 0.2 ft
CL = 0.078 / degree CL tail = 0.068 / degree lt = 1.2 ft
o = 0 it = 4.8 deg CM ac wb = -0.04
/ = 0.2 W = 0.03 lb
What is this aircraft’s trim speed (the speed at which it will fly in equilibrium) at sea level? What would happen if the aircraft were launched at 15 ft/s?
Solution: The aircraft’s trim diagram will indicate its trim angle of attack and hence its trim lift coefficient. The values of  and  define the trim diagram. First, calculate VH :
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