The relationship between induced drag and airspeed is, induced drag is
- directly proportional to the square of the airspeed.
- directly proportional to airspeed alone.
- inversely proportional to the square of the speed.
Explanation
Induced drag is the drag produced as a by-product of generating lift; at higher speed the wing needs a smaller angle of attack and weaker tip vortices to support the same weight. Because the required lift coefficient falls with the square of speed, induced drag varies inversely with the square of airspeed, making it dominant at low speed.
JD2016 asking:
Induced drag results from production of lift. Lift depends on airspeed squared, not 1 over airspeed squared.
Community Comments (2)
P
pB1B2 Posts: 6 23.01.2017 / 22:55
Induced drag is inversely proportional to the AR(aspect ration). The induced downwash angle and therefore the induced drag, depends upon the difference in pressure between the upper and lower surfaces of the wing, and this pressure difference is the lift produced by the wing. It follows then that an increase in CL (eg manoeuvres or increased weight) will increase the induced drag at that speed. In fact, the induced drag varies as CL2, and therefore as weight2, at a given speed.
i hope to help you:)
i hope to help you:)
J
JD2016 Posts: 54 23.01.2017 / 23:52
Yes, you are right. I am confusing Parasite Drag (which does increase with speed squared) with Induced Drag. I think I have been doing too many of these tests - now I can't see the wood from the trees! :)
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