PPRuNe Forums - View Single Post - No, not that QFE/QNH debate.
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Old 6th Feb 2020, 22:25
  #24 (permalink)  
MarcK
 
Join Date: Oct 2004
Location: California
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Originally Posted by Jim59
If you were a sailplane pilot you probably would see a need. When working out if you can reach your destination on a glide your key numbers are your height above the airfield, the distance to run and your current glide angle. With a performance of 45:1 you can cover a little over 7 nm per 1,000 feet so to get there with 1,000' spare to do the circuit and landing you need to be at or around 2,000' QFE with 7 miles to run or 3,000 at 14 nm. Trying to do that calculation based on QNH just complicates the issue.
That's only true if you intend to land at the field you departed from. How do you translate QFE to an off-field landing site? It's easier with QNH and a chart.
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