Want to raise your average? Consistency is key — and it starts with your ball. All bowling balls are not made equal. Did throwing the ball make your hand hurt? These balls are made to be durable and to allow many different people to use it. There are 4 different types of bowling balls based on coverstock material.
Each coverstock reacts differently on the bowling lane. Choosing the right type of bowling ball is a very personal choice. Not to mention all the different designs. There are four types of bowling lane oil conditions to be aware of, dry, medium-dry, medium, medium-heavy, and heavy oil.
Oil effects the bowling lanes by helping your bowling ball glide down the lane, without the oil on the lane your bowling ball as well as the lane would get really scuffed and damaged. After awhile the lanes would be useless due to all the damage. Bowling balls have different cover stocks that react differently to different oil patterns. Have you ever noticed the guys at the bowling alley with multiple bowling balls?
Want to learn why no 2 bowling lanes are the same? Dry bowling lanes will create more friction between the bowling ball and the lane. Dry bowling lanes are easier to hook a bowling ball on than lanes with lots of oil.
Medium to heavy oil bowling lanes offers less friction which is when bowling balls with more grip will help with hooking the ball and getting strikes. Such balls are extremely durable and rank the highest among cover stock materials.
Urethane has the ability to protect the ball from all kinds of mechanical abrasions. Urethane balls have an exceptional hooking potential, and as such, it is a common choice among intermediate and advanced players since hooking potential is what largely determines the success in bowling. Professional players who want to improve their game even further make Reactive Resin cover stock balls as their weapon of choice.
The only drawback to these bowling balls and their high price. Such bowling balls allow for immense control and provide the best hook potential. They also allow for an exceptionally high pin impact.
ProActive or Particle cover stock balls are very uncommon. Reactive resin is the coverstock formulation that fundamentally changed bowling. Compared to the urethane coverstocks they replaced, reactive resin covers produce significantly more friction with the lane surface , resulting in very big back end motions, increased entry angle into the pocket, and improved pin carry. With the exception of a small number of urethane balls that are now available, almost all mid-range to high performance bowling balls on the market today have reactive resin coverstocks.
While each and every reactive resin coverstock is unique, manufacturers typically classify their covers into one of three groups: reactive solid, reactive pearl, or reactive hybrid.
So what do these names mean? In general, the names themselves mean nothing, other than that they help bowlers know which bowling balls have the same coverstocks.
An example of this is what Roto Grip is doing with its latest coverstock names. Bowling balls come from the factory with a wide variety of surface finishes.
Broadly speaking, bowling ball surfaces are typically either sanded or polished. The very simplistic way of thinking about coverstock surface finish is to remember that rougher finishes help the ball produce more friction and tend to make the ball hook earlier than smoother finishes.
Similarly, polished surfaces are useful for situations when the bowler needs to get the ball farther downlane before hooking.
The on-lane performance of a coverstock is a direct function of the magnitude of the sliding friction force it produces when the ball is traveling down the lane. Friction is an extremely complex topic, but a high-level way of thinking about this is to say that both the chemical makeup of the coverstock and its surface finish play primary roles in affecting the amount of friction it produces on-lane. Many of the factors identified as having a large impact on performance were coverstock-related, including several that were previously not widely known to the general bowling public such as surface roughness and oil absorption rate, for example.
One answer to this question is that it is somewhat difficult to accurately measure the friction force as the ball travels down the lane particularly in the oiled portion of the lane , but it is comparatively much easier to measure things like surface roughness, oil absorption rate, and hardness.
In fact, many pro shop operators can even perform some of these measurements right in front of their customers. It is just important for bowlers to remember that when comparing two balls, one ball having higher surface roughness than the other does not necessarily guarantee that it will hook more.
Most casual observers of our sport assume that bowling balls are just simple uniform spheres. Modern bowling ball cores come in a wide variety of types, shapes, and sizes. We touched on pancake cores above in the discussion of three-piece balls vs. Pancake cores are typically found in polyester balls and entry-level urethane and reactive resin balls.
Regardless of the exact shape that is used, the performance characteristics of low performance pancake-type cores are all very similar. Namely, they all typically have higher RGs and low RG differentials , the latter of which causes them to create very little track flare.
In other words, the layout options for pin-in balls are fairly limited although there are a few advanced layout options for pin-in balls that are occasionally used in some circumstances. The next level of sophistication in core technology is the symmetrical core. Technically speaking, a pancake core IS a symmetrical core, but most bowlers and pro shop operators think of pancake cores and traditional symmetrical cores as being different.
In bowling terminology, this translates to those cores which do not have a significantly high intermediate differential. The convention among most ball drillers and manufacturers is to treat balls that have small intermediate differentials for example, less than 0. Broadly speaking, there are two types of symmetrical cores: those that have axisymmetric geometry and those that have non-axisymmetric geometry. A bowling ball core with an axisymmetric geometry is one that can be created by revolving a two-dimensional profile about a central axis.
One popular example of an axisymmetric core shape is the famous light bulb core that has been popular now for many years. The classic light bulb core is an example of a symmetrical core that has an axisymmetric geometry. In this example, the yellow two-dimensional profile is rotated about the red axis to produce the three-dimensional light bulb shape.
The other type of symmetrical core, the non-axisymmetric symmetrical, has geometry that is more complicated than the axisymmetric symmetrical, but is still mathematically symmetrical due to the values of its principal mass moments of inertia. An example of a core that falls into this class is the Resurgence Symmetric core that is found in the Columbia Eruption line of bowling balls. Its shape is mostly axisymmetric, but it does have a few small non-axisymmetric features.
Another hypothetical example is shown in the image below. This example core shape is mathematically symmetrical, but it does not have an axisymmetric geometry. Note that there is no simple two-dimensional profile that could be rotated about the red axis to produce the final three-dimensional geometry.
So, should anyone really care about the difference between an axisymmetric symmetrical core and a non-axisymmetric symmetrical core?
In most cases, not really. The main reason for mentioning the axisymmetric vs. The only way to really know if a core is symmetrical or asymmetrical is to review the RGs and differentials provided by the manufacturer. Symmetrical cores are available in a wide variety of RGs and differentials. The common generalization made about symmetrical cores is that they tend to be smoother and more even-rolling than their asymmetrical counterparts.
While symmetrical cores only have two distinct principal mass moments of inertia, asymmetrical cores have three.
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