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  #11  
Old 01-02-2020, 08:46 AM
svyolo svyolo is offline
 
Join Date: Oct 2017
Location: bellingham, wa
Posts: 197
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Quote:
Originally Posted by Jetmart View Post
Why 3 way versus 4 directions? I would like a copy of your XLX sheet.

Thanks
The 3 directions should form a triangle. Not just 3 directions. An EFIS with gps inputs makes things even far easier than doing this:

Go straight into the wind. Wait for speed to stabilize. Record GS, TAS, and wind.
Do a 180, and record the same. The GS, TAS, and wind should be the same. If not you probably have a pitot static error.

The only "measured" value is GS. TAS and wind are calculated. The easy indication that tells you something is amiss is the wind has changed significantly.

If you need to do a 3 way, it needs to be a triangle. By that I don't mean a geometric triangle over the ground, but 3 headings/legs that form a triangle.

And yes, it can be don't with just 3 headings that don't form a triangle, but the math gets a lot harder.
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  #12  
Old 01-02-2020, 11:30 AM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 8,600
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Quote:
Originally Posted by svyolo View Post
The 3 directions should form a triangle. Not just 3 directions. An EFIS with gps inputs makes things even far easier than doing this:

Go straight into the wind. Wait for speed to stabilize. Record GS, TAS, and wind.
Do a 180, and record the same. The GS, TAS, and wind should be the same. If not you probably have a pitot static error.

The only "measured" value is GS. TAS and wind are calculated. The easy indication that tells you something is amiss is the wind has changed significantly.

If you need to do a 3 way, it needs to be a triangle. By that I don't mean a geometric triangle over the ground, but 3 headings/legs that form a triangle.

And yes, it can be don't with just 3 headings that don't form a triangle, but the math gets a lot harder.
Additionally, to get accurate data, the heading reference must be accurately calibrated (I.E., magnetometer calibration.)
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Any opinions expressed in this message are my own and not necessarily those of my employer.

Scott McDaniels
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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