If the unaccelerated stall speed is 60 knots, what is the stall speed under a load factor of 2.5 Gs?

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Prepare for the Airplanes and Aerodynamics Commercial Pilot Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

If the unaccelerated stall speed is 60 knots, what is the stall speed under a load factor of 2.5 Gs?

Explanation:
Stall speed rises with the square root of the load factor because increasing weight (or G-load) requires more lift to reach the same coefficient of lift, so you have to fly faster to generate that lift. With an unaccelerated stall speed of 60 knots, and a load factor of 2.5 Gs, the stall speed is Vs = 60 × sqrt(2.5) ≈ 60 × 1.581 ≈ 95 knots, which is about 96 knots. So the best match is the option around 96 knots. The other speeds don’t fit the math: 60 knots is the unaccelerated value, and 84 or 120 knots would correspond to different load factors (roughly 2 Gs or about 4 Gs, respectively).

Stall speed rises with the square root of the load factor because increasing weight (or G-load) requires more lift to reach the same coefficient of lift, so you have to fly faster to generate that lift.

With an unaccelerated stall speed of 60 knots, and a load factor of 2.5 Gs, the stall speed is Vs = 60 × sqrt(2.5) ≈ 60 × 1.581 ≈ 95 knots, which is about 96 knots.

So the best match is the option around 96 knots. The other speeds don’t fit the math: 60 knots is the unaccelerated value, and 84 or 120 knots would correspond to different load factors (roughly 2 Gs or about 4 Gs, respectively).

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