Pin-on-Pap (aka Pin-on-Axis) equipment or close to that will tend to roll earlier, but it isn't quite that simple.
Pin-Axis balls roll "earlier" because we're using the lowest Rg of the ball. If the ball's minimum Rg is 2.6 and the layout is pin-on-pap, the core's effective Rg is still higher (and will promote more length) than a ball with a maximum Rg of 2.55 with a layout drilled with a 6 inch pin or beyond, such as pin-on-track.
Flare and lane conditions must also be taken into account. Assume we have two balls of the same make and model but with two different layouts: one pin-on-pap, the other with a 5-inch pin-to-pap. On a longer, flatter pattern, the pin-on-pap will actually go longer because it will flare very little if at all. The 5-inch pip-to-pap will flare and be able to create more friction while still in the oil. When both balls roll off the back of the pattern, the pin-on-pap ball still has oil on the part of the ball in contact with the lane. It won't hook much until that oil rolls off the ball onto the lane, making it go even farther down the lane before it hooks. The 5-inch pin-to-pap will roll off the back of the pattern and present a fresh portion of the ball to the lane surface and be ready to hook.
On shorter patterns, the situation is generally reversed. The pin-on-pap ball will tend to hook sooner and want to roll out. We've got the low Rg working against us (length-wise) now because as it traverses the drier surface of the lane, the same portion of the ball touching the lane heats up more and creates more friction on the longer, drier part of the lane.
Personally, I've had much success with pin-on-pap (or very close) equipment on sport conditions, adjusting cover as needed for length (or lack thereof) to match the pattern.
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J.J. "Waterola Kid" Anderson, the bLowling King : Kill the back row
Edited on 9/4/2008 10:59 AM