# FAQ: What Is Vmo In Aviation?

## What does VMO MMO stand for?

VMO / MMO. — Maximum operating limit speed for turboprops or jets.

## Why does VMO decrease with altitude?

Because EAS decreases with altitude for a given mach number, sonic flow starts to predominate (so Mmo takes over) – because higher altitudes will have lower dynamic pressures (which makes Vmo less critical).

## What is the difference between VMO and Vne?

Vne is indeed associated with piston planes and Vmo with turbines (including turboprops). Vmo is expressed in knots and is generally a constant. At some altitude (the knee altitude), the limit is expressed in Mach so you have Mmo. Vmo =Mmo at the knee altitude.

## How do you calculate V speed?

You can use the following formula to calculate Maneuvering Speed: V a = V a √ (WNew/WMax-Gross), where WNew is the current aircraft weight.

## What are the V speeds in aviation?

Regulatory V-speeds

V – speed designator Description
V S Stall speed or minimum flight speed in landing configuration.
V S1 Stall speed or minimum steady flight speed for which the aircraft is still controllable in a specific configuration.
V SR Reference stall speed.
V SR Reference stall speed in landing configuration.
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## What is Mach buffet?

Mach buffet is a function of the speed of the airflow over the wing—not necessarily the speed of the aircraft. An aircraft flown at a speed too slow for its weight and altitude necessitating a high AOA is the most likely situation to cause a low-speed Mach buffet.

## 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.

## Why does airspeed increase with altitude?

At higher altitudes, the air density is lower than at sea level. Because of the progressive reduction in air density, as the aircraft’s altitude increases its true airspeed is progressively greater than its indicated airspeed.

## 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.

## How is VNo determined?

I also found out that ” VNo is a calculated speed based on the wing loading of the aircraft. For utility aircraft it is 33 times the square root of the wing loading. It is called the structural cruise speed at which speeds must be below to avoid damage in turbulence.”

## Can aircraft speed exceed VMO MMO?

As defined by FAR 25.1505, Vmo / Mmo is the “Maximum Operating Limit Speed that may not be deliberately exceeded in any regime of flight (climb, cruise, or descent) except where a higher speed is authorised for flight test or pilot training operations”. All Boeing airplanes are certified to this rule.

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## What speed is VMC?

Familiar to pilots of multi-engine aircraft, Vmc is the speed below which aircraft control cannot be maintained if the critical engine fails under a specific set of circumstances (see 14 CFR part 23). It is marked as a red radial line on most airspeed indicators.

## What is V1 and V2 on takeoff?

A: V1 is the speed by which time the decision to continue flight if an engine fails has been made. V2 is the speed at which the airplane will climb in the event of an engine failure. It is known as the takeoff safety speed.

## What speed is VNO?

The FAA defines Vno in the Pilot’s Handbook of Aeronautical Knowledge as “the maximum speed for normal operation or the maximum structural cruising speed. This is the speed at which exceeding the limit load factor may cause permanent deformation of the aircraft structure.” The definition sounds a little clunky, right?

## What is the landing speed of a 737?

With a very common 737 -800 the landing speed is about 180-200 knots. It does depend on the weight of the aircraft, but typically the approach speed of a 737 is around 145knots.