Standard Definition for Tips of English

For those interested, all of the most-common definitions for "tips of english" (including all of the ones mentioned in this thread) are described and illustrated on the "tips of english" resource page.

Percentage english (relative to the miscue limit) is a much better method to describe the amount of sidespin applied. See the resource page for more info.

Enjoy,
Dave
 
Interesting, I always took it to mean as a deviation from the point of contact at center ball, not from the area the tip covers. Never have I thought of it being off the tip diameter.

So in the diagram that would be as a 1/2 tip, but to me it's 1 tip. Meaning offset from contact point not from the area of coverage by the tip. I think that makes more sense to people anyway. Half a tip is where you move over from center half a tip diameter.
 
pt109 said:
That's what I tend to do....I range from center ball to the miscue zone with % in between.
....although sometimes I tell 'em to load it....or just a hair.
Click to expand...

A hair, a smidge, a touch, a little, a lot, and gobs
 
Well Dave...we'll just have to agree to disagree. The results of the Jacksonville Project say different. When the 'contact patch' appears to be bigger, it's just chalk dust blowback from the tip contact...not a change in actual contact patch size.

Scott Lee
http://poolknowledge.com

dr_dave said:
Scott,

FYI, this is not correct. The size of the contact patch varies with tip hardness, tip shape, and shot speed.

You can use whatever definition of "tips of english" you want, but IMO "the size of the contact patch for an average-speed shot with an average-hardness tip of typical curvature" is not an ideal definition for "tip." :)

Regards,
Dave
Click to expand...
 
Scott Lee said:
dr_dave said:
The size of the contact patch varies with tip hardness, tip shape, and shot speed.
Click to expand...
Well Dave...we'll just have to agree to disagree. The results of the Jacksonville Project say different. When the 'contact patch' appears to be bigger, it's just chalk dust blowback from the tip contact...not a change in actual contact patch size.
Click to expand...
Scott,

You can "agree to disagree" all you want, but this is very basic physics. The chalk mark on the ball is mostly due to the "print" left by the amount of compression (and flattening) of the tip on the CB. A hard tip at very slow speed flattens very little, leaving only a tiny chalk mark. A soft tip at very fast speed flattens a lot, leaving a large chalk mark. This is clearly obvious at a pool table when playing with somebody who hits firm shots with a soft tip. One of my teammates leaves gigantic chalk marks on the CB when he plays. Whenever I play against him and see the large chalk marks on the CB (especially from his break shot), I feel like I should use gearing outside english on every shot to prevent cling/skid/kick.

I viewed and read all of the info from the Jacksonville Project, and I don't remember anything about the contact patch (chalk mark) size not varying with tip hardness, tip shape, and shot speed. And I can't imagine that Bob Jewett (one of the Jacksonville Project principals) would make any claims that violate the laws of physics.

Regards,
Dave
 
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