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Discussion in 'Spin Bowling' started by someblokecalleddave, Nov 9, 2011.
I'm not 100% sure, but I know kids that bowl leg breaks and they bowl at a similar speed to me and they get the ball to drift, I bowl somewhere in the 35-42 mph region I reckon, but I've not had it checked for years. I was heartened this world cup series to hear and see Majid Haq bowling at 35mph and taking some wickets and keeping batsmen in their place, very impressive.
Not important at all in my opinion. If you get enough revs on the ball and give it some flight it will drift. There are too many factors you have to take into consideration to ignore one entirely, though.
ah, I have a link for it... http://ffden-2.phys.uaf.edu/211_fall2010.web.dir/Patrick_Brandon/what_is_the_magnus_effect.html
if that is correct, then I think balls will drift roughly the same distance over the length of a wicket whatever their speed is, and a ball spinning 20 revs/s will drift twice as much as one spinning 10 revs/s.
Yes but an important thing to remember is that if the ball is delivered with less speed the trajectory must be slightly higher in order to hit the same length as a quicker ball. Therefore it should drift more, not because of less pace but a higher trajectory, so speed indirectly affects drift.
Some interesting stuff here from recent paper at Sydney University on spin bowling and cricket. It's at the very bottom of this unfinished blog post.
From what I have seen, it is just from the Magnus effect. If the ball is spinning with only overspin and sidespin, it won't drift, however, if you angle the seam so that there is a slight amount of flying-saucer spin, it will create a bit of drift from the flying saucer spin. Graeme Swann did this quite well. He even has a variation with only flying saucer spin so that it drifts a little more but doesn't turn much. Speed would kind of affect drift in the way that if you bowled a ball 30 mph and another one 50 mph with identical spin amount and direction, they would both have the same trajectory with regard to drift, not gravity. Here is Graeme Swann explaining his flying saucer delivery, starting at 1:20 in the video:
I don't like Swanne, but his bowling action just looks absolutely perfect, everything about it looks smooth. I especially like the way he goes from the gather through the un-furling of his arm, in that increasing arc from under his chin to the release and how it just looks amazingly synchronised with the rest of the body.
hi eiglow, that's not quite correct: the ball delivered with a 'pure' leg spin (or indeed mixture of legspin/topspin with spin axis horizontal) *will* magnus drift, predominantly to leg, this surprisingly significant phenomena is comprehensively explained in the pencil cricket link.
As I understand the theory you are right about the ball speed although my practical experience is that slower stuff doesn't (seem to) drift.
Does the seam have to be on a 45 degree angle to get drift or not or is it all about the amount of rev's on the ball
ish i suggest u just tak on pace bowling it is much easier to master. i hope this helps.
Any type of sidespin with enough revs will get drift.
Topspin = dip
Sidespin = drift
A mixture of topspin and sidespin = a mixture of drift and dip = the ideal delivery