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#1
June 8th 20, 10:41 PM
posted to rec.aviation.soaring
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VNE vs altitude: glider specs vs rules of thumb
On Monday, June 8, 2020 at 1:27:57 PM UTC-6, Andy Blackburn wrote:
TAS vs IAS does increase at about 2% per 1,000 ft Although looking at the data of the protocol and the glider specs, it's really closer to 1.4% per 1000 ft. Certainly 2% is easier to use and 1% is too little. The "10Kft, 2% rule" kind of splits the error. V is too high at 10K and too low at 40Kft. I have to say while it's not accurate enough for the table I will make for my glider, it's a good rule of thumb for on-the-fly estimates. 
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#2
June 9th 20, 03:30 PM
posted to rec.aviation.soaring
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VNE vs altitude: glider specs vs rules of thumb
On Monday, June 8, 2020 at 2:41:56 PM UTC-7, Bret Hess wrote:
On Monday, June 8, 2020 at 1:27:57 PM UTC-6, Andy Blackburn wrote: TAS vs IAS does increase at about 2% per 1,000 ft Although looking at the data of the protocol and the glider specs, it's really closer to 1.4% per 1000 ft. Certainly 2% is easier to use and 1% is too little. The "10Kft, 2% rule" kind of splits the error. V is too high at 10K and too low at 40Kft. I have to say while it's not accurate enough for the table I will make for my glider, it's a good rule of thumb for on-the-fly estimates. The difference between 1.4% and 2.0% is a dangerous place to play...
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#3
June 9th 20, 04:12 PM
posted to rec.aviation.soaring
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VNE vs altitude: glider specs vs rules of thumb
The glider specs use 1.4%, so it's neither play nor dangerous.
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