Hi,
On a CRP5 computer there is a blue arc on the front to get the temperature rise (ram rise) for a given TAS. This option probably doesn't exist on a E6B.
Ram Rise (TAT- SAT) by itself is actually only dependant on Mach number. You cannot make a really exact calculation in your example, because to know your mach number, you need to know the SAT in the first place.
However, this formula gives a good estimation based on TAS:
TAT= SAT + (TAS/100)²
With this formula the ram rise is 21 degrees, according to the blue arc on a CRP5 the rise is about 22,5 degrees. So the SAT will be around - 46 degrees with the formula.
The ,correct' formula is this one, by the way:
TAT= SAT(1+0,2M²)
Last edited by Da-20 monkey; 8th August 2012 at 13:14.