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[ProCricketer1982]

Er, WHAT? Are you serious?! The speed of the delivery was 86mph, which is measured just as the ball leaves the hand. The ball loses 10-15mph by the time it reaches the batsman and would have slowed down further after hitting the bat. At most it hit the helmet at 75mph. Where on earth do you get 100mph from? It is basic physics that the ball will only ever lose speed, not pick up speed once it has left the bowler's hand.

Does it not increase in speed when hit??

[Bruce]

Does it not increase in speed when hit??

On a full face, smash over cow, perhaps.
On a feint top edge is say no.

[smilley792]

On a full face, smash over cow, perhaps.
On a feint top edge is say no.

So how do top edges fly for 6 yet byes dribble to the boundary??

[fasteddie]

I think the problem is the impact will force the helmet backwards and into your face if its to close.

I can speak from first hand experience of that. Fielding at short leg with a borrowed lid I got one on the grill which bent and cut/dug into my chin. Had to pull it out. Ouch!

[Bruce]

So how do top edges fly for 6 yet byes dribble to the boundary??

Elevation, upward thrust, gravity.
Think of the Trescothick shot- upper cut type shot that he plays so well, he helps it on it's way.

[joeljonno]

Elevation, upward thrust, gravity.
Think of the Trescothick shot- upper cut type shot that he plays so well, he helps it on it's way.

Stand at first slip for two same paced deliveries.  One to a defensive shot and one to a drive. The attacking shot goes faster and further.

Nowt to do with an upper cut type shot off the face of the bat. Genuine edges.

A ball can pick up pace off the edge of a bat.

[Vitas Cricket]

Er, WHAT? Are you serious?! The speed of the delivery was 86mph, which is measured just as the ball leaves the hand. The ball loses 10-15mph by the time it reaches the batsman and would have slowed down further after hitting the bat. At most it hit the helmet at 75mph. Where on earth do you get 100mph from? It is basic physics that the ball will only ever lose speed, not pick up speed once it has left the bowler's hand.

Tripe.

[Manormanic]

Er, WHAT? Are you serious?! The speed of the delivery was 86mph, which is measured just as the ball leaves the hand. The ball loses 10-15mph by the time it reaches the batsman and would have slowed down further after hitting the bat. At most it hit the helmet at 75mph. Where on earth do you get 100mph from? It is basic physics that the ball will only ever lose speed, not pick up speed once it has left the bowler's hand.

WHAT, are you stupid?   The speed of the delivery was x-y (with y being the effective drag of the pitch) before Broad hit it - but afterward it will have been (x-y)+z with z being the force of the strike.   

Need an idea of the force involved?   When has a bowler ever conceded six byes?  what happens when a batsmen gets a big top edge?

[FattusCattus]

And they dare to call us nerds!

[Pelican042]

When has a bowler ever conceded six byes?

Never its in the rules this can't happen by boundary (just being picky)

[Steveo1000]

Never its in the rules this can't happen by boundary (just being picky)

Rules or Laws? Just being picky.

[RossViper]

As for speed increasing after the ball is hit, it's simply the additon of the 2 vectors.  A thin top edge won't add much speed, is say.

The force needs to be considered as a vector really

[brokenbat]

The other variable that may not have been tested in the "laboratory" is the angle of entry. Perhaps the results are different if the angle is what Broad experienced. As an Airtek user myself, I hope they are able to provide some answers fairly quickly.

[crictech]

add air density and humidity factors which can make upwards of 15% difference

[crictech]

and when considering the distance the ball travels when it hits the bat you have to take into account the coefficient of restitution or elasticity of the ball