promotion image of download ymail app
Promoted

Help choosing an airfoil?

Can anyone tell me the ideal NACA airfoil for a low speed (120 mph) cargo aircraft designed for STOL with leading edge slats, no wing sweep, and an annhedral angle of about 20 - 30 degrees.

3 Answers

Relevance
  • Anonymous
    10 years ago
    Favorite Answer

    The NACA 6409 is great on the low end but you'd have to run the Reynolds numbers to see if it would go 120 with your power, wing chord etc. Also check out the Eppler sections, and the newer Selig wing sections. I think an Eppler 214 works good with slats.

    Source(s): Worked on wing section testing, in a wind tunnel .
    • Commenter avatarLogin to reply the answers
  • Anonymous
    10 years ago

    There is no ideal airfoil. Everything is a compromise and it depends upon which parameters are most important to you. The NACA 4412 is one of the most tried and true (and perhaps the most studied) low speed airfoils of all time and lends itself well to STOL designs with LE slots. However, 20-30 degrees is a HUGE amount of anhedral that you only see in horizontal stabilizers, not wings. Anything over 4-5 degrees in a conventional design imposes many difficulties that are not easy to surmount, not the least of which are ground clearance and maneuverability issues. 2-3 degrees is typical and it is often coupled with sweepback.

    • Commenter avatarLogin to reply the answers
  • Anonymous
    10 years ago

    What's the range requirement? Fuel? Payload? Size constraints? Powerplant(s)/hp/thrust?

    Without those, it's like buying a set of 205-70 R15 tires not knowing what car they will go on...

    • Commenter avatarLogin to reply the answers
Still have questions? Get your answers by asking now.