# When T thrust D drag and lift L weight W then flight is?

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## What is the relationship of lift drag thrust and weight when the airplane is in straight and level flight?

Weight, lift, thrust and drag are the acting forces on an airplane. Assuming a straight and level flight, lift must be equal to weight and drag must be equal to thrust. This is what happens if this equilibrium is violated: If lift becomes greater than weight, then the plane will accelerate upward.

## What is thrust drag lift and weight?

Weight is the force of gravity. It acts in a downward direction—toward the center of the Earth. Lift is the force that acts at a right angle to the direction of motion through the air. Lift is created by differences in air pressure. Thrust is the force that propels a flying machine in the direction of motion.

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## What is the force that counteracts the thrust force for flight?

The force working against thrust is called drag. It is caused by air resistance and acts in the opposite direction to the motion. The amount of drag depends on the shape of the object, thedensity of the air and the speed of the object.

## What happens when thrust equals drag?

When thrust equals drag, the airplane keeps moving at whatever speed it is already moving. Thrust needs to exceed drag in order for the aircraft to accelerate forward. … If lift equals weight and thrust equals drag, there is no net outside force acting on the aircraft.

## What are the 4 forces of a plane?

It flies because of four forces. These same four forces help an airplane fly. The four forces are lift, thrust, drag, and weight. As a Frisbee flies through the air, lift holds it up.

## How do planes fly with gravity?

Planes do not actually defy gravity, though. Instead, the tilt and area of a plane’s wings manipulate the air particles around the plane, creating a strong enough lift that the force of gravity is overcome by the force of the air beneath the wings.

## How can drag be reduced?

Some things can be done to reduce pressure drag:

1. Using an aero helmet to reduce the low-pressure zone directly behind the head.
2. Keeping the body as low as possible so air stays attached as it flows over the back.

22 февр. 2011 г.

## How can drag be altered?

Motion of the Air

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Like lift, drag actually varies with the square of the relative velocity between the object and the air. The inclination of the object to the flow also affects the amount of drag generated by a given shaped object.

## What is the purpose of a stall strip?

Stall strip (SS) is a lift modifying device usually triangle in shape, installed to the leading edge of airfoil in wind turbine and aircraft. Installation of stall strips serve the purpose of modifying the streamline flow around the airfoil so that the stalling effect is altered [2].

## What major force must be defeated in order for an object to fly?

Gravity and drag (air resistance, which is friction caused by air rubbing against the plane) try to pull the plane down and slow its speed. A plane must be built so that lift and thrust are stronger than the pull of gravity and drag by just the right amount. Lift from the wings is used to overcome the force of gravity.

## Can an airplane fly without a propeller?

(Inside Science) — Scientists have created the first airplane that can propel itself without moving parts. … Instead, it electrifies air molecules and rides the resulting “ionic wind.”

## What are the 6 fundamentals of flight?

Principles of Flying. (1) Lift, (2) Gravity force or Weight, (3) Thrust, and (4) Drag. Lift and Drag are considered aerodynamics forces because they exist due to the movement of the Airplane through the Air.

## Is thrust proportional to drag?

Tests show that lift and drag forces acting on a wing are roughly proportional to the wing area. … This force is thrust. Thrust is derived from jet propulsion or from a propeller and engine combination. Jet propulsion theory is based on Newton’s third law of motion.

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## What is the best type of shape an aircraft needs to be to reduce drag?

A quick comparison shows that a flat plate gives the highest drag and a streamlined symmetric airfoil gives the lowest drag, by a factor of almost 30! Shape has a very large effect on the amount of drag produced.

## What creates more drag on an airplane?

The more surface area exposed to rushing air, the greater the drag. An airplane’s streamlined shape helps it pass through the air more easily. Drag is created by the force of air particles striking and flowing around the airplane, and it is overcome through thrust.