aerodynamicsFAA-published sample question (FIA, Aug 2021)
(Refer to FAA-CT-8080-5H, Figure 18.) What is the stall speed of an airplane under a load factor of 2 if the unaccelerated stall speed is 100 knots?
FAA Figure 18Stall speed vs. load factorFAA-CT-8080-5H · Flight & Ground Instructor supplement
A
115 knots.
B
129 knots.
C
140 knots.✓ Correct Answer
Explanation
Stall speed increases in proportion to the square root of the load factor. At 2 G, the stall speed is 100 x square root of 2 = 100 x 1.414 = about 141 knots, which matches 140 knots. The other values would correspond to lower load factors (about 1.3 and 1.7 G).
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