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  1. P

    Darrol Stinton's statement on wing AR(aspect ratio) for minimum induced drag

    Yes. For the compromise with wing structure weight. But for induced drag, it states the best AR is around 13 to 15. That confuses me. Read the whole picture text.
  2. P

    Darrol Stinton's statement on wing AR(aspect ratio) for minimum induced drag

    But I don't have a real application now. I was just confused by the statement of the book.
  3. P

    Darrol Stinton's statement on wing AR(aspect ratio) for minimum induced drag

  4. P

    Darrol Stinton's statement on wing AR(aspect ratio) for minimum induced drag

    I've put on the picture of the text
  5. P

    Darrol Stinton's statement on wing AR(aspect ratio) for minimum induced drag

  6. P

    Darrol Stinton's statement on wing AR(aspect ratio) for minimum induced drag

    Yes. Induce drag is proportional to 1/b^2 for a certain weight, IAS and Oswald efficiency factor. I suppose Darrol Stinton's statement in his book is about for a certain wing surface area, so larger AR means larger span.
  7. P

    Darrol Stinton's statement on wing AR(aspect ratio) for minimum induced drag

    In Darrol Stinton's book 'The design of the aeroplane' page 143, it states that the wing AR of aeroplane around 13 to 15 makes induced drag a minimum while glider induced drag is minimum when wing AR is 40 or more. May I ask why there's a difference? It seems to me that the higher the wing AR...
  8. P

    Looking for documents on slotted flap leading edge design

    Talking about trailing edge flap's leading edge. Not leading edge flap (slat).
  9. P

    Looking for documents on slotted flap leading edge design

    Hi, I’m looking for knowledge on slotted flap airfoil design, especially on flap airfoil’s leading edge design. I think there must be some old reports from NASA on this issue (at least discussing physics on this issue), but I failed to find them. Does anyone know what are the names or...
  10. P

    Generate coordinates for airfoil v16-15.5-0.7

    Hi, I’d like to generate the coordinates of Airfoil v16-15.5-0.7. May I ask how to generate (calculate) the points coordinates? What are the formulas used in calculating these coordinates?
  11. P

    Turbulence model used in GA CFD

    Hi, CFD is used as a design tool in GA design. Which CFD turbulence model is typically used in GA company?
  12. P

    Ask for self-learning path recommendations to develop UAV autopilot system

    Could you recommend any classic books on multi rotors or fixed wing autopilot algorithm? Thanks.
  13. P

    2 segments airfoil v.s. 3 segments airfoil for STOL

    I saw the STOL Competition 2014 on youtube. https://www.youtube.com/watch?v=gPcmb_lCeT4 It was amazing. But there’s one thing I don’t understand. In my opinion, all the STOL airplane need to use 3 segments airfoil (slat, main wing, flap) like CH701 to minimize the taking off and landing...
  14. P

    How high does the manned crop duster fly above the farmland?

    This is apparently true for fixed wing. But for helicopter, intuitively I would guess the tip vortex is related to the rotating speed of the rotors rather than the cruising speed of the helicopter.
  15. P

    How high does the manned crop duster fly above the farmland?

    Yes. But if it doesn't spray as well as helicopter, the lost due to that may cost more. Has any pilot here once spray tree plants?
  16. P

    How high does the manned crop duster fly above the farmland?

    My neighbours in my hometown grow fruit trees. I once saw them spray their trees by an helicopter, but not fixed wing. The helicopters' strong downward rotating winds from the powerful rotors blow the pesticide through the trees. There're quite some theories about this physics. But the fixed...
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    Stability requirements for automatic control and navigation UAV

    My design has forward propeller configuration. More forward C.G. means more longitudinally stable aircraft. Engine is the only thing that I can move forward to have C.G. more forward. For this reason, I have a longer fuselage nose to have engine more forward. But I pay weight to the long...
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    Forward propeller thrust line too high, then tilt up propeller?

    Usually conventional RC with forward propeller tilt down its propeller by 2-4 degrees. In my idea, maybe my drawing is too much exaggerating, I'd like to tilt up the propeller by 2-4 degrees as well. So the configuration doesn't look change that much.
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    Forward propeller thrust line too high, then tilt up propeller?

    I think it depends on the downstream influence of the propeller as well. So you don't see a problem of that special 'tilting up' compared with the conventional 'tilting down'?
  20. P

    Forward propeller thrust line too high, then tilt up propeller?

    I see your point that no matter the airplane has forward or backward propeller the tilting of the propeller is mainly decided by the trim calculation and have the drawing like what you described will do help people on the understanding and calculation of the trim. I will make that drawing during...
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