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# Anyone plz give me a formula about how e6b calculate the caliberated airspeed

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As we know, an e6b takes in three knowns---------temperature and pressure altitude, and true airspeed, to calculate the unknown----------caliberated airspeed.

I've been trying to find a formula that describes how this function works, but all I found was how cas is related to mach number, pressure ratio, static pressure, stagnation pressure and lots of other fancy stuffs. I hope to program the function into a computer and I want it to be using the same inputs e6b is using, instead of the fancy stuffs. So plz show me such a formula, that describes how cas is calculated from the only 3 inputs,which are temperature, pressure altitude and true airspeed.

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Maybe this will help...

Alan :pilot:

"I created the Little Black Book to keep myself from getting killed..." -- Captain Elrey Borge Jeppesen

AMD 1.9GB/8GB RAM/AMD VISION 1GB GPU/500 GB HDD/WIN 7 PRO 64/FS9 CFS CFS2

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At the Aviation Formulary site you'll find all kinds of forumlae and other math solutions related to aviation. What you want is probably on this page.

Larry N.

As Skylab would say:

Remember: Aviation is NOT an exact Science!

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That website shows how to find tas using cas only, but I want to find cas using tas. I tried to use the formula given on that website inversely but it could not properly calculate cas.

update:Hey the inverse function actually works. I always used left side temperature-pressureAL window on the e6b to calculate the cas, which is very wrong. Now when I compare the result from right side window and the result given by the inverse function, it is actually very consistent.

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To Viperpilot2: The video is a instruction of using e6b.It doesn't give the formula. It doesn't help.

Update: I always used left side temperature-pressureAL window on the e6b to calculate the cas, which is very wrong. Now when I test function with the correct e6b results, it's actually very consistent. Thanks for that video.

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