Just out of curiosity...

It is my understanding that the s.o.s. at sea level is around 680 mph. Of course this is dependent upon atmospheric pressure, humidity, temperature, etc.

Does anyone have info regarding the s.o.s. and how much it decreases at different elevations above sea level? Say, in 100' increments and not accounting for variations of the above mentioned variables. (If temperature has great bearing on the results then please mention it also.)

I've done some calculations regarding prop tip speed using 600 mph as the s.o.s. at around 1400' above sea level. I'm wondering how close I am.

Thanks,
Jeff