# Often asked: Why Does The Barber Pole Change With Altitudw?

## Why does stall speed increase with altitude?

As air density decreases with increasing altitude, more lift must be generated by an aerofoil to sustain flight and so the true air speed at which an aerofoil will stall will increase.

## What does a barber pole indicate on an aircraft?

Close to the speed of sound, an aircraft becomes susceptible to buffeting caused by shock waves produced by flying at transonic speeds. Thus, as the speed of sound decreases, so the maximum safe operating speed of the aircraft is reduced. The “barber pole” needle moves to indicate this speed.

## What changes indicated stall speed?

Factors such as total weight, load factor, power, and center of gravity location affect stall speed—sometimes significantly. Stall speed increases as weight increases, since wings need to fly at a higher angle of attack to generate enough lift for a given airspeed.

## When altitude increases the stall speed IAS will?

Your indicated (IAS) stall speed stays the same because it is not directly affected by density altitude changes. However, your true airspeed stall speed does increase with altitude. 2) Most straight wing aircraft are designed to stall at the _______ first.

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## How many G’s is a 45 degree bank?

Load factor and accelerated stalls: A constant-altitude turn with 45 degrees of bank imposes 1.4 Gs, and a turn with 60 degrees of bank imposes 2 Gs.

## Does Mach depend on altitude?

Because the speed of sound increases with air temperature, and air temperature generally decreases with altitude, the true airspeed for a given Mach number generally decreases with altitude. The true airspeed corresponding to the critical Mach number generally decreases with altitude.

## What does the red stripe on a barber pole mean?

It represents the colour of blood. During the Middle Ages monks were required to shave the crown of their head, a function commonly performed by itinerant barbers. Barbers began to expand their role and became quasi surgeons, specializing in sewing up wounds and extracting teeth.

## Why does a barber pole spin?

The pole itself represents the rod which the patient held tightly during the bloodletting procedure to show the barber where the veins were located. Spinning barber poles are meant to move in a direction that makes the red (arterial blood) appear as if it were flowing downwards, as it does in the body.

## Why did barbers do surgery?

Because barbers employed an array of sharp metal tools, and they were more affordable than the local physician, they were often called upon to perform a wide range of surgical tasks. Barbers differed greatly from the medicine man or shaman, who used magic or religion to heal their patients.

## What is indicated when the stall speed is too high?

If the stall speed rpm is still high, then the forward clutch is defective. The test can also be made with the selector lever in R. If the stall speed is too high, it indicates slippage in either the direct/reverse clutch or in the 1st/reverse clutch.

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## What happens to the stalling speed when pulling G?

a reduction in weight will reduce the stalling speed. When you pull ‘g’, the stalling speed increases, e.g. if you pull 4g the stalling speed doubles!!

## What causes left turning tendency on airplane?

The propeller creates a spiral of air that spins about the airplane, eventually contacting the left side of the rudder. As power is increased and the propeller spins faster, the force on the rudder is stronger, causing more of a yawing motion to the left.

## Why does MMO decrease with altitude?

As you climb in altitude, air temperature decreases. That’s why jet aircraft have a moveable “barber pole” needle to show MMO, that automatically decreases with temperature. Glass panel aircraft use a similar digital marking.

## Why is it called coffin corner?

The name comes from the “coffin corner” found in Victorian houses (the slang and often refuted term for a decorative niche, or very small ‘corner’, cut into the wall of a staircase landing), because the target area is very small.

## What is Mach buffet?

Mach buffet (vibrate) is “high-speed” buffet. It occurs when too fast in an airspeed or too high in an AOA near the Mmo. Usually, airflow separation due to shock wave as well as wave drag produces a turbulent wake behind the wing, which causes the tail surface to buffet (vibrate).