How fast is the plane?
The car can check the speed by rolling the wheels.
So how do you fly when an airplane isn't rolling wheels?
There are several ways to measure airplane speed.
Protrudes like a beard in front of the plane,
It's called a pitot tube.
Because it was invented by a French scientist
It's named after Henri Pito.
Once the principle is
If you put water in a bent straw
The water will fill up in the straw.
If you push the straw straight forward, the water will rise.
The faster the straw moves, the higher the water level.
This is the principle of the pitot tube.
It's just using air, not water.
The faster the plane flies, the stronger the pressure on the pitot tube
Is to measure it.
But this is a measure of the speed of air flow
This is not an accurate measurement.
If you are flying at 800km / h
If the wind blows at 100km due to the headwind,
Pitot tube is a measure of air flow, so it measures 800 km,
When viewed from the ground, it would appear to fly at 700 kilometers per hour.
Therefore, the value measured by the pitot tube is not the actual speed.
To do this, I use the satellite navigation system 'GPS'.
The satellite calculates the speed by locating the plane.
So we use the pitot tube and GPS to calculate the speed.
The speed displayed on the cockpit's Primary Flight Display (PFD) is Indicated Air Speed (IAS).
The computer accepts the air velocity recognized by the pitot tube, calculates the data, and displays it in the PFD.
On the other hand, the speed displayed where passengers boarded is GPS Indicated Speed (GIS).
The speed of the plane, measured by GPS. Also known as True Speed.
It tells you the real speed.
For reference, the fighter also uses the inertial navigation system.
The fighter may sometimes take a sudden flight such as a vertical rise or vertical descent
This should be done from time to time.
Because I can measure it
In this case, the speed of the inertia is measured and calculated.
When boarding a civil aircraft, the speed of the plane is usually set to less than 1000 km.
You can see it at cruise speed.
This is also the speed at which fuel consumption is the most economical.
But fighters have a concept of mahara.
This is the concept that Austrian scientist Ernst Mach introduced in supersonic research.
As high-speed vehicles such as bullets, planes, and missiles move in normal air,
It is used when high speed air flows.
A value that determines the speed of a moving object based on the speed of sound.
Mach 1 is based on sound speed. This is about 1,200 kilometers per hour,
Speeds faster than Mach 1 are called supersonic speeds and speeds less than 1 are subsonic.
When an aircraft flies at high speed over Mach 1 in the air, a large shock wave is generated around the aircraft.
As it occurs, the air's properties change suddenly, sometimes called the 'sonic boom'.
Finally, airplanes usually use Knot's units.
This unit is based on how many nautical miles went per hour.
One knot has a speed of approximately 1.8km / h.
1 nautical miles is 1854 km.
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