Haha. Good Point Compressor Stall. I undestand we have the same amount of molecules horizontally impacting the aircraft as it’s the same IAS but what about the vertical axis? Shouldn’t be less molecules per cm3 as air is less dense so overall less molecules impacting the windscreen? I drew a picture to try to explain how I picture things.
https://ibb.co/mWmwAJ
Sorry I’m terrible at drawing but I would think at sea level an aircraft will hit more molecules than at high altitude as they are more close together as seen on my drawing. I’m no expert tho.
Please correct me if I’m talking rubbish. Another thing came to my mind: At high altitude IAS is actually overreading due to compressibility by about let’s assume a random value of 10kt. So our 280kt IAS at FL360 is actually equivalent to 270kt IAS at sea level if we consider the overreading due compressibility. Surely 10kt makes a difference in term of noise?
Thanks.