ATP Written - convert Mach number to TAS

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04-23-2009, 11:07 AM

#11

rickB

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Joined APC: Feb 2008

Position: HS125

Posts: 194

just memorize the answer

04-26-2009, 02:34 PM

#12

Stringer

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Joined APC: Sep 2008

Posts: 103

In case you still need the formula, i think it's:

TAS = Mach No x LSS

and

LSS = 38.94 x (T)^1/2
(38.94 multiplied by square root of temperature in degrees kelvin)

so

TAS = Mach No x 38.94 (T)^1/2

04-27-2009, 11:13 AM

#13

RAHPilot5

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Joined APC: Dec 2008

Position: E-170 Airbender

Posts: 341

A
B
B
A
C
A
D
A
B
A
over and over (ABBA CA DABA) and............... abra ca dabra, you pass!

Its' majic so don't tell anyone.

04-27-2009, 11:15 AM

#14

RAHPilot5

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Joined APC: Dec 2008

Position: E-170 Airbender

Posts: 341

Quote:

Originally Posted by Airfix

anybody got the magic formula?

Up Up Down Down Left Right Left Right B A Select Start and you can take the test 30 times.

or

007 373 5963 and you can go right to Mike Tyson and ask him.

04-27-2009, 02:20 PM

#15

joepilot

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Joined APC: Jul 2008

Position: 747 Captain (Ret,)

Posts: 804

If your E-6B doesn't have the mach number pointer buy one that does. Yeah, I know you will never use it again. Maybe one of your friends has one you can use.

Joe

04-28-2009, 03:56 AM

#16

Joachim

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Joined APC: Jan 2007

Posts: 745

Local speed of sound = 39.84*sqrt of temp in Kelvin.

Mach = TAS/LSS

04-28-2009, 10:28 AM

#17

NismoRacer

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Joined APC: Dec 2008

Position: 737 FO

Posts: 35

I agree with the sheppard air thing I used it and got a 98. Its the best out there, just use that.

04-28-2009, 03:37 PM

#18

CessnaCitationX

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Joined APC: Apr 2007

Position: my desk, studying

Posts: 29

Mach 1 = sqrt(gamma*R*temperature)

Mach 1 (in meters/sec) = sqrt(1.4*287*(288.15+OAT))

Multiply that by 1.944 to get knots.

The final equation is below. It's accurate to within about 1 knot.
Mach No. x 1.944 x sqrt(401.8(273.15+OAT)).

Last edited by CessnaCitationX; 04-28-2009 at 03:49 PM.