Posted by MarkB_MI on June 13, 2015 at 07:48:29 from (70.194.33.6):
In Reply to: Re: Nice jet posted by oneshot on June 13, 2015 at 07:24:44:
>Mark, "any aircraft will stall before it reaches a 90 degree AOA" Have you even seen the Thunder Birds or the Blue Angels perform?
oneshot, I suggest you look up the definition of "angle of attack". I can assure you that military pilots are well aware of their aircraft's angle of attack; in fact many military aircraft have angle of attack indicators. AOA indicators don't go much above 20 degrees, because once the wing stalls it's pointless to increase the AOA.
Pretty much the only military aircraft that can fly with a ninety degree AOA are VTOL aircraft such as the Harrier and USMC F-35, or vectored-thrust aircraft like the F-22. And it's debatable whether or not they are really "flying", given that the wings are generating no lift. Even helicopters are subject to wing (rotor) stall at high angles of attack, but that occurs when the forward airspeed is so fast that's there's no airflow over the receding rotor blades.
There are some aircraft that can "hang on the prop", Sean Tucker's sooped-up Pitts comes to mind. But these aren't flying with a ninety degree AOA: the airflow over the wing (which is all propwash) is still at a relatively low angle.
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