Collection of recommendations and tips

# How does thrust change with altitude?

## How does thrust change with altitude?

As air density increases, airflow increases, and , consequently ,the thrust increases . When pressure increase , as with increased airspeed or decreases altitude, density increases, and when temperature increases as on a hot day , density decreases.

## How does thrust affect the flight of the plane?

Thrust works opposite of drag. When the forces are balanced, a plane flies in a level direction. The plane goes up if the forces of lift and thrust are more than gravity and drag. If gravity and drag are bigger than lift and thrust, the plane goes down.

How does jet engine thrust change with altitude?

As altitude increases air mass flow into engine decreases, thrust also decreases for same throttle setting. Since air mass flow rate decreases fuel flow is also reduced proportionately by engine control system.

### What are the factors affecting thrust?

FACTORS AFFECTING THRUST The factors that affect the thrust of a gas turbine engine include air density, airspeed/ram effect and engine RPM. The effect of these factors is not restricted to any particular gas turbine engine; although a certain engine may be able to compensate for an effect better than another.

### Does thrust decrease with altitude?

Since higher air-speeds are normally used at higher altitudes, thrust generally decreases with an aircraft’s altitude. But increasing altitudes can erode thrust because the mass of air being consumed is also decreasing as the air gets increasingly more rarified.

Why does thrust decrease as airspeed increases?

Factors Affecting Thrust – Airspeed: As the inlet velocity (v initial) approaches the magnitude of the exhaust velocity (v final), thrust is reduced. Therefore, if the mass of air and fuel is held constant, thrust will decrease as airspeed increases.

#### What happens if drag is greater than thrust?

If thrust is greater than drag, the aircraft will speed up, and subsequently, if drag is greater than the thrust, you’ll slow down. Lift is the force that counteracts the weight of an object in order to keep it in the air. As the aircraft goes faster, lift increases until its force is equal to weight.

#### What force is thrust?

Thrust is a mechanical force. It is generated most often through the reaction of accelerating a mass of gas. The engine does work on the gas and as the gas is accelerated to the rear, the engine is accelerated in the opposite direction. To accelerate the gas, we have to expend energy.

Do jet engines produce more thrust at higher altitudes?

The amount of power generated at high altitude is higher because the aircraft is flying at a much higher speed here than at low altitude (Power = Thrust x Speed).

## How does engine speed affect thrust?

On a jet engine, thrust is proportional to rpm (mass flow) and temperature (fuel/air ratio). These are matched and a further variation of thrust results from the compressor efficiency at varying rpm. The jet engine is most efficient at high rpm, where the engine is designed to be operated most of the time.

## Why does thrust decrease as altitude increases?

Does thrust change with velocity?

Specific thrust only depends on the velocity change across the engine. We have to include the pressure correction term since a rocket nozzle produces a fixed exit pressure which in general is different than free stream pressure.