One of the severest operational limitations of a fighter is high angle of attack. I would like to discuss a philosophy of requirements on approach to testing and aircraft improvement. I will also summarise the results of the recent USAF, F-4E Stall/Near Stall Investigation.

For review, consider the classic approach used to testing at high angle of attack. All fighters are stall tested, i.e. a determination of handling qualities is made up to maximum usable lift. This, of course, also involves determination of natural stall warning, stall speeds and stall recovery techniques. Testing at angles of attack above maximum usable lift is generally delayed until a spin test programme is accomplished.