What is thrust ? Define.
Answers
Thrust is the propulsive forces acting on the airplane, in the forward direction. There are 4 forces acting on an Airplane. Lift force acting upward, Weight acting downwards. Drag Force acting opposite to the direction of movement of the airplane. Thrust is the propulsive forces created by the Engines, measured as Pounds of Thrust.
For a straight and level flight, Lift force equals to the Weight of the Airplane. Thrust equals to the Drag force acting on the airplane.
The Thrust can be increased or decreased, by advancing or retarding the Throttle in the cockpit. The Thrust is low when the Engines are idling. The Thrust is generally highest during Take-off. The Thrust is varied by increasing or decreasing the fuel flow, by varying the position of the Throttle lever in the flight deck.
Rocket engine:
Thrust=(mass flow)*(exhaust velocity)
Jet engine:
Thrust=(mass flow)*(exhaust velocity - free stream velocity)
Answer:
Thrust
It is a force or a push. When a system pushes or accelerates mass in one direction, there is a thrust (force) just as large in the opposite direction. In math and physics, this is described by Isaac Newton's second and third laws. Thrust is used to describe how strongly an engine pushes.