Originally Posted by
bunghole
G'day BOAC,
From 0.2 to 0.6 Mach you can ignore compressibility. The graph distinctly shows a decrease in alpha on the lift limit (from about 12 to 8 alpha over this speed regime)
Interesting.
Conventional wisdom has it that compressibility effects aside there is a slight positive dependency of AoAmax on Reynolds number i.e. velocity.
Meaning that at higher speeds AoA max should be slightly higher than at lower speeds. (Background: IIRC it is due to earlier Boundary layer separation at higher speeds causing the stream to stay semi-attached longer).
The fact that in this case it is the opposite seems to point towards compressibility effects.
What type of aircraft are we talking about?
regards,
henra