"Kayak Chris" wrote: > What does "utility category" mean?
Google for "utility category aircraft", and https://en.wikipedia.org/wiki/Load_factor_(aeronautics) is at the top. Utility means 4G load factor, and Normal means 6G. > Where is this formula, not sure what to look for (I tried) I googled "aircraft stall speed equation example", and the one at the top is https://www.quora.com/How-do-you-calculate-the-stall-speed-of-an-aircraft and the third one on the list is https://www.rcgroups.com/forums/showthread.php?t=789635 For the lift coefficient of the "new" airfoil (Cl), see the wing lift polar diagram at http://www.krnet.org/as504x/design.html , which shows it to be about 1.55 at stall angle of attack. Mark Langford ML at N56ML.com http://www.n56ml.com
