25
ABBREVIATIONS
DA Density Altitude
OA Oxygen Altitude
ET Elapsed Time
TS Throttle Stop
SLET Sea Level ET
ALT/
ET
Ratio: change in ET for every 100’ change in Altitude
TSR Throttle Stop Ratio
VP Vapor Pressure
GOW Grains of Water grains per pound
DP Dew Point
ADR Air Density Ratio
CF Horsepower Correction Factor
GUIDELINES FOR ACCURATE PREDICTIONS
For ET predicting it is recommended that 5 to 6 Good Runs be
entered into a database and that there is a span of at least 1000’ feet
in DA or OA between the runs.
Ex: Typical Good Data
Run #1 1223’ 10.20
Run #2 1301’ 10.204
Run #3 1956’ 10.236
Run #4 2000’ 10.237
Run #5 2245’ 10.249
Run #6 2269’ 10.25
For TS predicting it is also recommended that 5 to 6 runs be entered into
a database and that there is a span of at least 1000’ feet in DA or OA
between the runs. It is also recommended that there is some variance in
the timer settings between the runs. In other words change the timer
setting for at least 3 of the runs. The timer should be adjusted enough to
cause up to a 0.30 second change in ET. If you normally have about 2
seconds in your timer make a run with 1 second and another with 3
seconds. This should accurately set your TSR.
Good Runs:
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