How do you convert Mack speed to km.per hour?

Question

How do you convert Mack speed to km.per hour?

Answer 1

Mach speed varies due to altitude,air pressure, weather conditions etc. so there is no fixed point for the speed of sound.

Under normal conditions at sea level the speed of sound is near as you like to 762 miles per hour.

1km is 5/8 of a mille

So mach 1 would be 1219km/h

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Answer 2

The Mach number is commonly used both with objects traveling at high speed in a fluid, and with high-speed fluid flows inside channels such as nozzles, diffusers or wind tunnels. As it is defined as a ratio of two speeds, it is a dimensionless number. At a temperature of 15 degrees Celsius and at sea level, the speed of sound is 340.3 m/s (1,225 km/h, 761.2 mph, or 661.7 kn) in the Earth's atmosphere. The speed represented by Mach 1 is not a constant; for example, it is dependent on temperature and atmospheric composition. In the stratosphere it remains constant irrespective of altitude even though the air pressure varies with altitude.

Since the speed of sound increases as the temperature increases, the actual speed of an object traveling at Mach 1 will depend on the fluid temperature around it. Mach number is useful because the fluid behaves in a similar way at the same Mach number. So, an aircraft traveling at Mach 1 at sea level (340.3 m/s, 761.2 mi/h, 1,225 km/h) will experience shock waves in much the same manner as when it is traveling at Mach 1 at 11,000 m (36,000 ft), even though it is traveling at 295 m/s (654.6 mph, 1,062 km/h, 86% of its speed at sea level).

It can be shown that the Mach number is also the ratio of inertial forces (also referred to aerodynamic forces) to elastic forces.

Answer 3

try  www.onlinecoversions.com

Answer 4

Mach speed is dependent on temperature. You can also use Altitude at standard temperature.

Mach 1 = speed of sound

At 30,000 feet standard temperature is -47.98 degrees F

-47.98 F = -44.33 C

At 40,000 feet standard temperature is -69.70 degrees F

-69.70 F = -56.50 C

1 nautical mile = 1.852 kilometer

1 statute mile = 1.609344 kilometer

Let's say you're at Flight Level 400 (40,000 feet or 12,192 meters) and your Mach speed is 0.83 or 83% of the speed of sound. Using standard temperature and the Naval Aviators Standard Altitude Table, the speed of sound is 573.8 knots. 83% of that is 476.254 knots and multiplied by 1.852 equals 882.022408 kilometers per hour.

Also try the calculator from the website below. The numbers do not match exactly because of rounding of decimals, but are very close.

By the way, your spelling of Mach is incorrect. Ernst Mach was a Bohemian-Austrian physicist and is the namesake of the Mach number.

Answer 5

The speed of sound at sea level at International Standard Atmospheric Pressure and Temperature, the speed of sound is 761.2 miles per hour. multiply that by 1.6 to get km/h, and you have your answer

Answer 6

roscoedeadbeat&Malcolm T are wrong!!

MACH 1=545MPH

Answer 7

grab your e6b, spin it around until you find the mach index in your temp window, correct for your temperature, and read it off the scale

Answer 8

Mach 1 = 760 MPH, which off the top of my head is around 1223 kph