How To, by Storm Bowling: a series of brief videos that show how to find speed, rev rate, axis tilt, and axis rotation. "We make more high-performance bowling balls than anyone in the world. A bowling ball is a hard spherical ball used to knock down bowling pins in the sport of bowling. Balls used in ten-pin bowling typically have holes for two fingers and the thumb. Gifted with the ability to manipulate the weather and its aspects, Storm is among the most powerful of the X-Men. Storm Products, Inc. has full time representation on the men's and women's Professional Bowling Tours. External knowledge sources. In the summer of 1994 the company name was changed to Storm Products, Inc. to more clearly identify the company with the growing strength of the Storm name. No Minimum $10 $20 $30 $40 $50 $60 $70 $80 $90 … The early 1990s brought development of reactive resin ("reactive") balls by introducing additives in urethane surface materials to create microscopic oil-absorbing pores that increase the "tackiness" that enhances traction.Hook potential has increased so much that dry lane conditions or certain spare shots sometimes cause bowlers to use plastic or urethane balls, to purposely avoid the larger hook provided by reactive technology.Finger inserts and thumb slugs are custom-fit urethane tubes inserted into the drilled holes, generally for balls with a fingertip grip.Ball motion is commonly broken down into sequential skid, hook, and roll phases.Various characteristics of ball delivery affect a ball's motion throughout its skid, hook and roll phases.Greater rev rates cause the ball to experience more frictional lane contact per revolution and thus (assuming non-zero axis rotation) greater and earlier hook (less "length"— which is the distance from the foul line to the breakpoint at which hooking is maximum); conversely, smaller rev rates cause less frictional engagement and allow the ball to hook less and later (more "length").Greater degrees of initial (at-the-foul-line) axis tilt cause the ball to rotate on smaller-circumference "tracks" (rings on the ball at which it contacts the lane on each revolution), thus reducing the amount of frictional contact to provide greater length and less hook; conversely, smaller degrees of axis tilt involve larger-circumference tracks with more frictional contact per revolution, thus providing less length and more hook.Loft—the distance past the foul line at which the ball first contacts the lane—determines the Various characteristics of ball core structure and coverstock composition affect a ball's motion throughout its skid, hook and roll phases.A "dull" (rough) ball surface, having spikes and pores,"Weak" layouts ("pin down": pin between finger and thumb holes) hook sooner but have milder backend reaction, while "strong" layouts ("pin up": pin further from thumb hole than finger holes) enable greater skid lengths and more angular backend reaction.Manufacturers commonly cite specifications relating to a bowling ball's core, include Differential of RG is the difference between maximum and minimum RGs measured with respect to different axes.Informally, a low-differential ball has been likened to one whose core is a spherical object (whose height and width are the same); a high-differential ball has been likened to a tall drinking glass (whose height and width are different); and a high-mass-bias ball has been likened to a tall drinking mug with a handle on the side (which has different widths in different directions).Higher-friction surfaces (lower grit numbers) cause balls to hook earlier, and lower-friction surfaces (higher grit numbers) cause balls to skid longer before reacting (hooking).Lane materials with softer surfaces such as wood engage the ball with more friction and thus provide more hook potential, while harder surfaces like synthetic compositions provide less friction and thus provide less hook potential.The lanes' physical topography—hills and valleys that diverge from an ideal planar surface—can substantially and unpredictably affect ball motion, even if the lane is within permissible tolerances.The basic specifications of five-pin balls are the same a duckpin balls: diameters from 4.75 to 5.0 in (12.1 to 12.7 cm), weights from 3 pounds 6 ounces (1.5 kg) to 3 pounds 12 ounces (1.7 kg); the balls have no finger holes.Candlepin bowling balls have a weight of between 2 lb 4 oz (1.0 kg) and 2 lb 7 oz (1.1 kg), and a diameter of 4.5 in (11 cm)—much smaller than the 8.5 in (22 cm) balls in ten-pin bowling, and even smaller than the 5.0 in (13 cm) balls in duckpin bowling .This 1894 patent shows how bowling balls once had a thumb hole and only a single finger hole. There are additional ways to acquire league-restricted items, see League-specific items for more details. Les quilles sont montées par un ascenseur et placées sur un distributeur. The name was also thought to have a universal quality, which would cut across cultural lines and be effective in both domestic and foreign markets, particularly in Pacific Rim countries. The Controll Solid Urethane is porous and predictable. Side rotation and hook are not illustrated.Diagram (top view) shows progression of various quantities as the ball moves down the lane:Bowling ball motion is affected by various characteristics of delivery, as discussed by, for example, Freeman & Hatfield (2018).Commonly cited specifications, RG (radius of gyration) and Differential of RG (indicative of flare potential), plotted on orthogonal axes.Bowling ball cores ("weight blocks") are described by various technical specifications such as RG, differential of RG, intermediate differential, and (a)symmetry.Bowling balls with cores exposed, as displayed in the Effect of coverstock, core and layout on ball motionEffect of coverstock, core and layout on ball motion sfn error: multiple targets (2×): CITEREFStremmelRidenourStervenz2008 ( sfn error: multiple targets (2×): CITEREFStremmelRidenourStervenz2008 ( sfn error: multiple targets (2×): CITEREFStremmelRidenourStervenz2008 (