By telleropnul, January 6, 2023
The knot is a unit of speed equal to one nautical mile (= 1.852 km) per hour, exactly 1.852 km/h (approximately 1.151 mph). multiply knots by two to get rough indication of km/h equivalent.
One foot is 30cm. three and a bit feet in a meter. 9000 feet altitude is 3/10th or roughly 1/3th in meters, so about 3000m or 3km (2.74km to be precise). So 1/3th to get rough altitude in meters equivalent.
https://learntofly.ca/airspeeds-v-speeds-vx-vy-vs-vs1-va-vno-vne-vfe/
https://www.youtube.com/@recreationalaviationaustra7066/videos
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