G'day again Fred,
I have had many requests for the ASI calibrating water manometer
details. The interest is such that it would be helpful if you could
fill in the blanks on the NACA "adiabatic standard" column.
Again, thanks for bringing the figures up to date,
John.
Fred Fillinger wrote:
>For best accuracy, remember to correct airspeed for nonstandard temp,
>barometer, and elevation.
>
>The #'s below didn't match the chart which comes with RMI's uEncoder,
>so I looked in a big booklet on the topic published by the predecessor
>to NASA. The #'s look closer to a NACA chart before correction for
>compressibility. No factor at glider speeds, but I added a few below
>as a sort of a footnote.
>
>Best,
>Fred F.
>
>
>
>>SPEED WATER
>>KNOTS HEIGHT NACA "adiabatic std"
>> in mm
>>30 15
>>40 26.5
>>50 41.5 41.5
>>60 59.5
>>70 81.5 81.4
>>80 105
>>90 134
>>100 165.5 166.7
>>110 200.5
>>120 239 241
>>130 380
>>140 325
>>150 373 378
>>
>>
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