Blackbird
Topic Author
Posts: 3384
Joined: Wed Oct 06, 1999 10:48 am

Speed-Gauge / Mach Indicators In Military Aircraft

Fri May 25, 2007 1:24 pm

I know commercial jetliners like the 707/DC-8/CV-880's speed-gauges often had problems with compressibility effects screwing up the airspeed readings.

During the time-period when supersonic fighters like the F-100, F-101, and F-102 began flying, did they have more reliable speed-gauges (IAS)?

Andrea Kent
 
rwessel
Posts: 2448
Joined: Tue Jan 16, 2007 3:47 pm

RE: Speed-Gauge / Mach Indicators In Military Aircraft

Fri May 25, 2007 3:09 pm

Quoting Blackbird (Thread starter):
During the time-period when supersonic fighters like the F-100, F-101, and F-102 began flying, did they have more reliable speed-gauges (IAS)?

For supersonic aircraft, you usually have KEAS (Knot Equivilent Air Speed - basically calibrated airspeed with corrections for compressibility) instead of IAS, since a conventional pitot-type airspeed sensor is impossible much past M1.0. Usually you have an air impact pressure sensor facing the breeze, plus some way of sensing the static pressure (itself a problem for supersonic aircraft), and then some way to integrate the two values.

I don't know about the early Centuries, but this was certainly a non-issue by 1960.

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