Wherewhendid dual speed on ias come from
The main push for a KNOT measure of aircraft speed came from the use of
DME in military aircraft........
Not exactly. Naval aircraft had used knots long before that.
TACAN development began in 1947, the military switched to knots and nautical
miles in 1946.
No, the *Air Force* switched to knots. See above.
vince norris
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