In war movies when a prop-driven plane gets shot down it always makes that high whining noise before it hits...so what's making the noise? Is the engine red lining or is it something to do with the air going over the wings....or is it just Hollywood?

I've seen two jets crash, and both were fairly quiet till the impact...
Information
Warning: This is a relatively older thread
This discussion is older than 360 days. Some information contained in it may no longer be current.