View Single Post
Old 03-10-2008, 11:10 PM   #11 (permalink)
Depends on the Day
RH77's Avatar
Join Date: Nov 2007
Location: Kansas City Area
Posts: 1,761

Teggy - '98 Acura Integra LS
Sports Cars
90 day: 32.74 mpg (US)

IMA - '10 Honda Insight EX
Team Honda
90 day: 34.76 mpg (US)

Tessie - '06 Acura TSX Base
90 day: 28.2 mpg (US)
Thanks: 31
Thanked 41 Times in 35 Posts
Aircraft Airspeed

Don't forget that air density and baro-pressure change as altitude increases.

For aircraft, since baro-pressure is very unreliable at higher altitudes, the standard 29.92 mm Hg is set at 18,000 feet and the call is Flight Level 1-8-0 instead of 1-seven-thousand, niner-hundred feet or lower...

Similarly, since the air is less dense at higher altitudes, the pitot tube can no longer be reliable to report the passing air molecules. Ground speed increases with the decrease in resistance, but the airspeed indicator vs. altitude has to be compared to aircraft documentation/reference , as to not induce an overspeed and consequent aircraft overstress situation. Comparisons to GPS (if equipped), should provide the most accurate velocity.


“If we knew what we were doing, it wouldn't be called research” ― Albert Einstein

  Reply With Quote