Speed of Sound

[Faster]

Some time ago, someone posted a formula for figuring the local speed of sound, I believe in knots that was simple and useful.

I can't remember what it was!!

Something like 39 x square root of the temperature in Kelvin?

Could a helpful soul re-post that formula with the particulars? :confused:

[GVI - SP]

a = 38.967854*sqrt(T+273.15)
where T is the OAT in celsius.

c.u.

[Bellerophon]

Click on this useful site (http://www.digitaldutch.com/atmoscalc/index.htm) to have it worked out for you.