Mach V formula
OK...I'm listing this here because you guys are more likely to have the info at your fingertips...or have sat the exams recently enough to remember the formula...
When I did my exams 20 years ago ( UK ) we had to know the formula to calculate Mach speed... my brain has suffered over the years ( Beer ) and although I thought that I still remembered it apparantly I've got it wrong.... My obviously mistaken formula was: TAS/LSS.... LSS calculated by: 38.94 x square root of K ( K I thought was -472 or something close.... Anyone out there that can help ? |
O deg K = -273 deg C
Formula is correct ISA S.L Temp = 288 Deg K thus LSS = 661 kts |
Mach No = V/a
Where: V is speed in m/s and a is the speed of sound. a = SQRT(Gamma x R x T) where: Gamma = ratio of specific heats (normally 1.4 for dry air) R = Gas constant (normally 287.0519) T = temperature (in kelvin) hope this helps stu |
Well done guys....Good luck...and watch out for the beer... :(
|
poor,
What does a pilot do with that formula once he has it ? |
What do you do with the formula
Bafanguy
Talk about it to people in bars etc. that you want to get rid off. And relate it to a mach no. of your car on the local A road" Works every time. Along with " It's really difficult to find work after getting out of prison". Hope this helps. JTK |
jamest,
...lol...I had my suspicions along those lines... |
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