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Determine the value of sink rate of glider which is operating with 4.2° of glide angle and has speed of 120m/s.

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Determine the value of sink rate of glider which is operating with 4.2° of glide angle and has speed of 120m/s.

(a) 8.78m/s

(b) 9.8ms

(c) 56.5ms

(d) 8.7ms

The question was posed to me at a job interview.

My question is taken from Flight Mechanics topic in chapter Performance and Flight Mechanics of Aircraft Design

1 Answer

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The correct option is (a) 8.78m/s

Easy explanation: Sink rate = speed*sine (glide angle) = 120*sine (4.2°) = 8.78m/s.

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