skwinty,
I don't know the purpose of your question about supersonic aircraft and I don't know the answer. Here is what I think. It is quite likely that the form of the airstream around a supersonic plane would change as it went through the sound barrier. It seems quite likely that these planes would be provided with two static ports, one for subsonic, one for supersonic flight. Each would be provided with approprate error correction procedures.
In the case we are discussing, we have a radalt altitude and a pressure altitude which disagree by 124 feet. You say: "The error introduced by the difference in the velocity of the airstream and the boundary layer is not significant."
If you dont think this 124 foot discrepancy is caused by something to do with the flow of air changing with speed, to what do you attribute it?
Are you suggesting that it is not the altimeter but the radalt that is wrong?
Last edited by gravity32; 16th Sep 2011 at 16:43.
Reason: Added last sentence