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TAS/SAS Selector
Press
again to select "TAS/SAS" icon.
Main Setup Display - Turn the ALTITRACK OFF - Delete Jump - Set total number of jumps - Set total freefall time
- Set current date - Set current time - Delete logbook - MPH / KMH - Feet / Meter - True Airspeed (TAS) /
Skydiver's Airspeed (SAS) - Canopy log Enable / Disable - Dive Type - Celsius / Fahrenheit - Beep ON / OFF
Definitions:
True Airspeed (TAS) and Skydiver's Airspeed (SAS) are two methods of calculating
the airspeed of a moving/flying/falling object.
TAS is a term used in aviation: It is the speed of an object relative to the surrounding
air, regardless of the altitude.
SAS is a new concept developed by LARSEN & BRUSGAARD: SAS is the speed of a
skydiver calculated from measurements of air pressure and temperature and con-
verted to a fixed air pressure (875.3 mb) and a fixed temperature (+7.080C) which
corresponds to 4,000 feet ASL
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TAS
A skydiver's True Airspeed (TAS) relative to the ground changes as a function of the
altitude (air pressure) and temperature which makes it difficult to compare fall-rates.
Example: A skydiver (in a fixed freefall position) who has a terminal fallrate of 62
meters/sec at 10,000 feet will have a terminal fallrate of 50 meters/sec at 3,000
feet. It will be seen that the difference in altitude (air pressure) makes it difficult to
compare the fall-rates when measured using TAS.
See separate section in the appendix for more information about TAS and SAS.
True Airspeed (TAS) / Skydiver's Airspeed (SAS)
NOTE: Jump data are continuously stored in both TAS and SAS. Stored information maybe displayed in either
unit of measurement by selecting the respective mode.
Press
to toggle between TAS and SAS.
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