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The conventional pitot tube cannot be used under______(a) 100 knots(b) 40 knots(c) 2 knots(d) 80 knotsI got this question in quiz.My question is from Helicopter, Optical and Hyper Sonic Air Data topic in division Air Data Systems, Altitude and Heading Reference of Avionics

Answer»

The CORRECT answer is (b) 40 knots

The explanation: The conventional pitot tube and the PRESSURE transducer become ineffective as airspeed drops below 40 knots. At the lower SPEEDS, IMPACT pressure is equal to dynamic pressure q, and the sensitivity of this pressure to a change in velocity is minimal.



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