If a player can bowl above 85mph – or if the ball has aged – this
makes it possible for the bowler to “reverse swing” the ball. In simple
terms this is exactly what happens – a delivery that is expected to
swing away from the batter (an outswinger), instead swings in towards
them (an inswinger) – and vice versa. This happens when the seam is
angled for conventional swing but this time the rough side faces the
batsman. If the ball is bowled fast enough (above 85 mph), the laminar
layer goes into a turbulent state before it reaches the seam. The seam
actually has a negative effect here and affects the turbulent layer so
it separates earlier compared with the bottom surface.
Like in conventional swing, there is a lateral force created because
of the pressure difference but this time the lateral force acts in the
opposite (reversed) direction. As mentioned, there is a critical speed
to help generate reverse swing but in cases where this speed can’t be
reached, the roughness of the ball can help reduce this critical speed
needed to create this reverse swing.
As the ball gets older (which means the surface is rougher) it
becomes easier to deliver balls with reverse swing. The fact that more
roughness makes it easier to create reverse swing introduces the
temptation for players to increase this roughness illegally and thereby
make it easier to generate reverse swing at lower speeds.
Yorker ke liye bahut practice karni padti hai. pehle apni line or length sudharo. Pehle showmotion me balling karke dekho, apni video banao bowling karte samay fir us video me dekho aap ka runup, action kaise hai apni galtiya sudharo. Fir pace pe kaam karo. Yorker daalne ka tareeka Knowledge Zone me hai. Aap ye video bhi dekh sakte ho. VIDEO
From Quora: Here some points to remember to generate sheer pace: A proper run-up : A bowler must accelerate as he gets closer to the stumps, while keeping both arms close to the body (close levers ensure no wastage of energy). A high jump: The momentum generated by the run-up is transferred to the jump. That's why most genuine quick bowlers - Imran Khan , Brett Lee , Malcolm Marshall - have a reasonably high jump A proper landing: When the front foot hits the ground, the force generated is transferred to the hip before moving upwards. The bowler rotates the shoulder, which uses the force it receives from the movement in the hip. This force is then transferred to the wrist. The result: The force generated from the run-up, the landing, the hip movement, the shoulder rotation and the wrist movement is translated into the speed of the ball. The more aligned the movements, the better the outcome. HINDI Tips Tip by Mohd Amir
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