When things go wrong in the wind tunnel, they go wrong quickly. Like at 200+MPH it takes all of about 0.3 seconds to get from test section to the prop. At that point, all bets are off.
When stuff up to and including Aluminum go through a B-29 prop spinning 1200RPM, there is not much left on the other side. I used a broom to sweep up the white bits of housing and the remains of the cooling fan that was inside the housing.