“Usually such tests were conducted in winter time, so
it was deadly cold without a canopy and I was pretty glad when this
heating began, counting minutes before the plane would reach enough
speed/velocity so that the air around becomes hot enough. But it wasn’t
the main problem for me. In my personal rating of the dangers connected
with such tests one of the most bad sides was the extreme roar. Because
of this extreme roaring you couldn’t hear the radio so you were flying
in deaf mode, you were afraid to pull throttle harder just because going
faster was meaning going louder.“, he continues.
Sumber