Quote:
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can be near constant over a certain altitude range.
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Who told you it was "near constant"??
The rule is Vy will be reduced 1 KNOT IAS per 1000 feet altitude. Vx will increase 1 KNOT IAS per 2000 feet altitude.
From sea level to 20,000 feet...
Vy changes 20 KNOTS, 23mph, or 37kph.....
Vx changes 10 KNOTS, 11.5mph or 18.5kph....