I've been told by a Civilian Pilot Training instructor that, until WWII,
most airplanes, light and heavy, had airspeeds displayed in mph.
Apparently the military wanted AI displays in kts. Following WWII, all
the prewar airplanes came out of storage still equipped with mph gauges,
and off-the-shelf old stock mph AIs were installed in the postwar
boom/bust airplanes. The CAA, not being the FAA yet, never issued an
edict from On High mandating everyone change their AIs. Those were
different times, I guess. But ever since, we have had the choice.
On 4/28/2020 10:02 PM, Phillip Matheson via KRnet wrote:
Please do not take this personally
But WHY does the USA still use mph. In aviation
Is it universal in USA.
Phil
Australia
Sent from my iPhone
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