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Example: A skydiver (in a fixed freefall position) who has a terminal fallrate of 62
meters/secat10,000feetwillhaveaterminalfallrateof50meters/secat3,000
feet.
It will be seen that the difference in altitude (air pressure) makes it difficult to
compare the fall-rates when measured using TAS.
SAS
The SAS formula calculates airspeed (using the same metrics used with TAS) as
though the complete skydive had been performed at a fixed air pressure and a fixed
temperature which corresponds to 4,000 feet ASL.. 4,000 feet is chosen as the
reference altitude by LARSEN & BRUSGAARD since this is the average altitude at
which the working time of a skydive is normally ended.
Conclusion
Using SAS, skydivers in any body position can express their vertical speed by a
number (SAS). This number remains virtually constant regardless of altitude with
little or no variance due to temperature differences and can be compared with the
airspeedsofotherskydivers.ThismeansthatregardlessoftheelevationoftheDZ
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