I'm new to aviation and I have a basic, mechanical question. Wings produce a lot of lift-induced drag, especially at lower speeds. But according to this chart that drops off as velocity increases.

enter image description here

However despite the fact that lift drag declines as speed increases the wings still represent roughly 70%(+/-) of the surface area of an aircraft and they do produce parasitic drag.

So my question is despite the enormous surface area that the wings represent do small, irregular shaped items such as exhaust ports produce more parasitic drag as a plane nears its top speed?

The pictures below are from a P-51 which has a top speed of over 400mph. At that speed is the wing or the exhaust port the biggest drag producer? Or is this maybe a close call?

Thanks so much for any input!

enter image description here

  • $\begingroup$ I'd suggest the wing has more drag - the exhaust pipes are right behind the 4-blade prop and all the turbulence they initially create. $\endgroup$ – CrossRoads Apr 13 '18 at 3:32
  • $\begingroup$ It's worth noting that the angled exhaust ports contributed significantly to the effective output of the engine. In the case of the Spitfire they contributed 70lb of thrust, equivalent to 70hp at 300mph. $\endgroup$ – user30284 Apr 13 '18 at 6:29

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.