Tuesday, May 23, 2017

RG And Differrential

RG Differential and RG What Does This Mean?

I will try to address this simply and with as little confusion as possible. I first must tell you I am not a scientist or a ball designer. I am always learning as are you. I am sure some of you have wondered what does some of the numbers on a bowling ball technical sheet mean and how does it affect me, the bowler. Why do I need to know it anyway. First I must address cover stocks and cores. The cover stock is like the tires on a car and the core is like the engine. These two things are what influence the bowling ball motion. You choose a bowling ball to match your style and the lane conditions you bowl on. Because of so many different style bowlers and bowling lane conditions, the ball companies make different types of balls, and are trying to make a ball that will sell. So that is why you see these numbers on a balls specs. sheet. Also, the USBC rates them to have a tolerance.

RG means Radius Of Gyration. The RG of a bowling ball tells you how soon the core is designed to roll. The lower the RG, the sooner the ball is designed to roll. The lowest allowed by the USBC is 2.43 the highest is RG 2.80. (USBC could change the rule anytime).

The RG Differential (also called just DIFFERENTIAL) -
This indicates the difference between the low RG and the high RG. The Differential indicates the potential for track flare which can be translated into hook potential. The higher the differential, the more hook potential the core possesses. The RG differential indicates the difference between the low RG and the high RG. The maximum differential allowed by the USBC is 0.060.Don’t get this confused with intermediate differential because that is different. This is used in asymmetrical bowling balls to measure the spin time of the bowling ball before drilling.
Note: All numbers on the spec. sheets are before drilling and that is an important factor as the numbers then change.
Ok this is what RG Differential and RG mean. But, the biggest influence in bowling ball motion is the surface of the ball and the force and direction of the bowler’s release. In addition, the condition of the bowling lane must also be taken into consideration...

Now here is a pretty good rule.

A lower RG ball with a low differential will produce an earlier rolling ball with a small arcing motion.
A lower RG ball with a high differential will produce an earlier rolling ball with a larger/stronger arcing motion.
A higher RG ball with a low differential will produce a later rolling ball with an angular backend motion.
A higher RG ball with a high differential will produce a later rolling ball with a strong, somewhat angular backend motion.

On differential:
The lower the differential the closer together the track flare. The higher the differential the further apart the track flare.The cover stock friction on the lane allows this to come together. Coverstock adjustment is needed to adjust to the conditions you are bowling on.Well I hope this helps and does not confuse you too much.

Good Luck and Good Bowling

Motion Of The Bowling Ball

The study of bowling ball motion are something that most bowlers know nothing about. In brief, there are three basic stages, or zones, a bowling ball must go through. These stages give the ball the proper reaction on a bowling lane. This has been the principal in bowling for the thirty years I’ve been in the game. Most bowlers don’t realize that a bowling ball goes through these stages.The bowling ball motion are as follows:

1. Slide – A bowling ball will first slide for a certain length of a bowling lane after it is released by the bowler. This is known as the head portion of the lane.
2. Hook – After the slide zone of the ball motion it will then transition into a hook zone.
3. Roll – Following the hook zone a ball will go into a roll stage. 
In summary – The stages of bowling ball motion are slide, hook, and roll.
You could Picture this like a rocket taking off from the earth to the outer space.

1. You must have a take off part so the rocket can get off the ground. = The slide.

2. After the rocket is off the ground it must transition to get out of the atmosphere. = The transition and hook.

3. Then transition again to adjust to the outer space itself. = The roll.

This is the same kind of concept involved in the study of bowling ball motion. 
Which is also true in bowling lane conditioning. The bowling lane conditions and the bowling ball motion must match for the best reaction.

If a ball slides, hooks, or rolls too early you will get roll out. If roll out is too early the ball stops and goes straight. If a ball slides, hooks, or rolls too late it will never grab the lane and could skid out. A bowler should study a ball rolling down the lane and realize that these stages happen. The study of Bowling ball motion is essential.

Sunday, May 21, 2017

Different Types of Bowling Balls

The Different Types of Bowling Balls 
Here are some of the different types of bowling ball cover-stocks and cores to date. First there are 5 types of cover-stocks that I am going to talk about they are plastic,
reactive pearl, reactive solid, reactive hybrid, and particle.

There are 3 main types of cores in a bowling ball which include 3 piece, 2 piece symmetrical, and asymmetrical. Now in more out lined detail
listed below.


1. Plastic - is usually used in 3-piece cores.  It does not have much traction on the lane and is lower in price.  It is mainly used as a spare ball or a beginner ball.

2. Reactive Pearl - is used in all types or cores.  Normally it has more of a skid snap reaction.

3. Reactive Solid - is used in all types of cores.  It has an earlier and smoother reaction than the pearl.

4. Hybrid Reactive - is mainly used in 2-piece symmetrical and asymmetrical cores.  This type of cover is made to give the bowler the best of both worlds as it has a combination solid reactive and pearl reactive.  It is mainly used on over and under bowling lane conditions.

5. Particles - This was a cover-stock that was made to combat heavy oil.  It had pieces, or particles, in the reactive cover to help it grab the lane surface.  There are not many companies making particles anymore, but there are a few. It was mainly used In 2-piece symmetrical and asymmetrical cores.

Note: Urethane Cover-stocks that were popular in the 1980's are now making a comeback.  They are not as aggressive as reactive bowling balls and are more powerful than plastic.  In addition, they are usually smoother in transitioning but do not have the hitting power of the reactive balls.