Chi-town
Topic Author
Posts: 893
Joined: Fri Sep 08, 2000 1:29 am

### Aircraft Speeds

Can anyone tell me how to convert knots into miles per hour. (mph)

thanks

HeavyCapt
Posts: 61
Joined: Mon Jan 15, 2001 5:00 pm

### RE: Aircraft Speeds

multiply knots by 1.15 and you'll have mph
ex: 100 (kts) X 1.15 = 115 (mph)

Brock "useacalculatororane6b" Mandrake

Western737
Posts: 465
Joined: Fri May 12, 2000 5:45 am

### RE: Aircraft Speeds

What about how to convert Mach into miles per hour (MPH)?

Top Gun
Posts: 103
Joined: Wed May 19, 1999 8:13 am

### RE: Aircraft Speeds

To convert Knots or MPH into Mach you need more info such as the ambiant temp and so forth. There is no straight conversion.

Guest

### RE: Aircraft Speeds

Definitely not as easy.....

TAS = MACH x 38.968 square root Temperature.

Temperature is in degrees kelvin. TAS is in Knots.

Or you could just use the good old Jeppesen E6 computer.

Western737
Posts: 465
Joined: Fri May 12, 2000 5:45 am

### RE: Aircraft Speeds

Gosh... That's pretty tough to understand the formula on conversation of mach into MPH. Boy, those chemist or physicist or any scientists making it quite difficult for normal like us to do the simple mathematics to figure it out.

norseman
Posts: 41
Joined: Thu Feb 22, 2001 10:22 am

### RE: Aircraft Speeds

Go buy a cheap E-6b flight computer. It will do it for you in a few seconds.

Guest

### RE: Aircraft Speeds

The speed of sound decreases as altitude increases.
Concorde flys at mach2, however this is at 55,000 feet, much higher than a typical 33,000 ft cruising altitude, where some passenger aircraft may fly at, say, mach 0.8.
http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html
look for speed of sound in menu on left, near to the bottom.

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