From an earlier thread:

Haha.

What's with all the advertising junk ??

Folks
I have flown in the jump seat of a p-51 doing 300 knot canyon runs. The mic came unhooked momentarily and I can tell you the pilot was screaming with his face 8 inches from mine and all I could do was read his lips. You can't hear flaps or gear execpt a faint thump when it locks down. The sound in these things at speed is deafening. The pilot wore earplugs under his headset in his helmet. Given the sound levels and the fact that a WWII pilot would have a over-the-ear-headset on, the only indication you will get of enemy on your six is when his bullets (or cannon rounds) are filling your plane with holes. Also, the prop outline is more obvious and much bigger than what we have in this sim. Might be an FOV issue tho.
SKUD

+1

First Hand Experience.

Thanks for posting. Nothing should be heard from outside.

Sound recognition is a bit like eye sight, some people have more sensitive hearing with better ability to determine/separate differing frequencies. Many are tone deaf. I know in my house I can hear a car door closing out side 90% of the time when no one else can. Also my wife can't tell when a tune is off key.

This you-tube vid was posted elsewhere on forum and some couldn't hear when the AC is flying in formation. I had no such problem. The hole resonance changes when instead of 12 cylinders 24 are vibrating the air and airframe.

http://www.youtube.com/watch?v=--2H9Dj9eMY

not quite.

So to you sound radar should be present because in real time one bloke in the whole luftwaffe or the raf might habe heard a plane when flying close?

All first hand accounts that I have read on this matter state that other planes could not be heard. This is a good indicator that the vast majority could hear nothing. I propose that we modell the environment after the most common pilot and not after some individuals with superpowers ...

well i yuesterday i was flying with a friend, and had my sound down to aobut 10% . to the point i couldnt ear my own engine. but i could hear is from about 200 meters. nice

No you read me wrong. I have no idea if you should hear another AC only that some people can hear things when others cannot.
My personal experience (with sound not ww2 AC)is working in a mineral sands processing plant. Wearing hearing protectors in deafening parts of the plant.You some times can't hear the bloke standing next to you but you can still hear other parts of the plant. A slipping v-belt,a front end loader going by or the PA system and sirens.

Just a further thought, when driving at say 110kmh on the open road (in a sound proofed vehicle)I can't hear say a fast moving Harley Davidson until it passes(I usually warn my wife and kids of its approach). But if the same bike gets caught behind me and matches my speed then I can hear him. So maybe approach speed also needs to be taken into account?