A colleague and I were discussing a plane that has been practicing
aerobatics near his house, and all the noise it was making. I started into
telling him how the prop was making most of the noise, and he seemed to
think I was crazy for thinking that.

I think I will have to show him something written, to believe me.

Better than any reading, take him where he can hear an SNJ (what the
Air Force mistakenly called a T-6) take off in "flat pitch" and then
reduce power. The noise will abate slightly when the trottle comes
back, but much more when the prop rpm is reduced.

vince norris