Hi Drew... I'll take a shot at your questions.
dR3w wrote:I don't know if I should have started a new thread, but I have a few questions relating to the results of this study if anyone would be kind enough to shed some light on the subject.
What I am most curious about, are the flare measurements, and what they mean, and how these results can even be possible.
1. First question, the measurements of flare in inches ... do they assume that the distances between flare lines is the same in the oil as in the dry. Meaning, does the separation between lines stay constant or do they grow or shrink?
Measurements are taken from the widest part of the flare ring, right midway between the two bowties. Sometimes the bowties are well defined in a small area while other times they are in a larger area of the ball, that is to say they don't cross at the same point. Generally they do keep the same spacing from wet to day but this too varies slightly from layout to layout. Also they increase in circumfrance with each rev until the ball is rolling end over end at their maximum circumferance.
dR3w wrote:2. Assuming that the flare line separation is constant, then the measurements of flare in inches would be proportional to the number of revs. Each Rev adds "x" amount of flare. Perhaps it is obvious to some, but I find it interesting that the flare in the dry can be higher, and sometime much higher than the flare in oil. I say this because the study states that it is using a 41 ft pattern. With loft at the line, the bowl will "approximately" spend twice as much time in the oil as in the dry. ( I do realize that the translational speed actually slows down as the ball moves down the lane.) To have more flare in the dry, then the average revs in the dry have to be approximately twice as much at that of the oil. I understand that balls rev up, but do they really more than double? Perhaps some of the measurement has to do with an increase in track diameter as the ball migrates down the lane, or the reduction in speed as it moves translationally down the lane. I assume that eventually the ball will typically roll at the pins, and that the initial track diameter will be smaller than the final track diameter.
Yes, you seem to have a grasp on what's going on. The final rpm of the ball down lane is realative to speed and friction, not initial rpm. Once the ball has cought up with the lane it's rpm is consistant with it's speed at that moment. So a guy with 275 rpm off their hand can have the same rpm when hitting the pocket as the guy releasing it at 450 rpm. Again is a factor of speed at impact.
dR3w wrote:3. What does the ratio of flare in the dry to flare in the oil actually tell us? Will a ball with more flare in the dry than in the oil typically move straighter through the front and more on the back than a ball with equal flare in dry and oil ... assuming same oil pattern, etc.
Thanks,
Drew
This is totally dependend on where on the lane your playing. Obviously if you in the oil longer, due to the way you line up, then your "opportunity" to get more oil on the ball increases. It's not the flare ratio that affects how much wet/dry rings you have, it the time in the oil vs the time in the dry areas. We have to keep this general because we have areas in between where some may argue it dry when its still wet or vise versa. You can have a ball that is designed to do something and that's good but it still comes down to "matching up" to the lane patter with the ball in your hand and watching ball motion to determine your next move, be it with your feet, target or ball change. Lane play and matching up is a vast subject to extensive for this discussion but I still hope you get my drift.
I hope this helps!
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