what is the purpose of thrust reversal?

Question

How does the designer ensure that the thrust reverser activated when aircraft has safely touched down?and what types of thrust reversal used for commercial aircraft ?

Answer 1

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Thrust reversers are used to provide additional deceleration upon touchdown or aborted takeoff (or even on icy taxiways), and to reduce brakes wear. Reversers aren't used in a measure they were before, and if they are it's often idle reverse (if no runway contamination). Reason: very effective brakes nowadays + reversing is costly + noise abatement. Reverse thrust is operated manually by pilots. Reversing a low-bypass ratio engines is done by actuating clamshell/bucket doors, enabling hot exhaust gases to be redirected. On a high-bypass engines, this is done by cold stream actuators (modern airliners). Propeller-driven aircraft could also use the feature (not reverse thrust but reverse pitch) by changing the pitch of props to negative angle.

Answer 2

The airplane has a weight on wheels switch that prevents reverse thrust from being used in flight.

Answer 3

It is simply to slow the aircraft down on landing and saves wear on brakes and tyres. It is very effective at higher speeds and runs no risk of skidding or blowing tyres.

It can take up to twice as far to stop a big, heavily loaded, jet without it.

Answer 4

it blows debris out of the way of the airplane when it's landing.

Answer 5

It's hard to answer this without a sexual pun.

xD