I wonder if the crash was caused by the hot weather, low air density, compression effects ? I know my model helis behave quite differently in hot weather, but does this scale up to real size helis/planes? My condolences to the aircrews families and friends.
Always a possibility until the investigation is conducted.
Yep! Sure does. Was part of a crash recovery team once for a KC-135 Tanker. The plane left Eielson AFB, AK fully loaded. Ground temp was around -20. During climb out they lost some of their hydraulics, declared an emergency and turned around. This caused a long final in which they hit a pocket of warm air and suddenly found themselves too heavy to fly. It bounced off the frozen river and into the forest and exploded. Not much left except several acres of burned trees and scrub.
maybe teh ailerons jammed - it was just refitted - it looks like they had a slow roll to inverted, and then couldn't work out how to get it right way up - trying first one and then another series up 'up sticks'.
It was what's called an accelerated stall. The stall speed rises as G loading on the wing increases, and they'd have a high loading coming out of that maneuver and their airspeed was relatively low. The stall speed ended up being as high as the airspeed, and the wing stalled. You can see the enormous angle of attack if you note the angle of the chord line of the wing and the line of travel; it's about
30 degrees, well beyond usual stall angle of about 17 degrees. It's extremely unlikely that there was anything wrong with the airplane. Any wobbling of the wings would be uneven stall progression along the span and the pilot's attempts to correct it. We have a video here of various airshow crashes, some of them suffering exactly the same fate. There's not much the pilot can do when he gets himself into such a situation at low level. "Tip stall" is a pernicious, misleading misnomer. If the tips are stalled, the whole wing is stalled, since the stall starts at or near the root and progresses outward as angle of attack increases. Dan