Dual Angle Lite
Let’s face it, this thing is complicated and rather intense. At the same time, it’s both very simple and very effective. I’ll try to break it down and explain what all the numbers mean without throwing a bunch of technical mumbo jumbo at you. The most important thing in understanding the Dual Angle layout technique is that it’s not a wild new way to lay out bowling balls. All it’s doing is making the process simpler and more accurate. If I were to drill a ball for myself and decide, “I would like this ball to rev early, have a moderate amount of flare, and have a hard arc on the backend,” I know based on how I throw the ball where to drill the fingers to accomplish that. When I go to apply to corresponding dual angle numbers that would also satisfy my requirements for the ball reaction, I always find that I’m really close. This is just a way of taking all the guesswork and room for error out, or a mathematical way to nail what you want every time you drill a ball. I also have a link to a companion video below to give you a visual of everything I talk about below.
This is the Dual Angle Lite, so I will attempt to keep it as simple as possible without getting into the heavy details. There are 3 numbers to the Dual Angle, initial or drilling angle, pin to PAP (positive axis point) length, and the angle to the VAL (vertical axis line). If somebody says “50x4x35,” 50 is the drilling angle, 4 means 4 inches from the pin to the PAP on the drilling angle line, and 35 is the VAL angle, which is measured from the PAP.
So what do those numbers mean? Recommended to stay between 10 and 90, the drilling angle controls the skid or length of the ball. The bigger the number, the more the ball is going to skid or the longer it’s going to get down the lane before it starts hooking. The pin to pap distance relates to flare, and has a small effect on total hook as a byproduct. Flare is used to describe the distance between each successive oil ring on the ball, or how far they are apart. The more space between the rings, the faster the ball is changing its core orientation or rotation, meaning it is revving faster and as a result, hooking more. Flare is considered to be at maximum at a length of 3 3/8”. If the number is smaller, on both a symmetrical and asymmetrical ball it will be a lower amount of flare, but still an earlier reaction. Past 3 3/8”, flare begins to reduce for a symmetrical ball, but will still remain high for an asymmetrical, though the larger the number gets, the more forward roll the ball will have, or the more it will have a “hook/set” type reaction rather than a continuous roll, to a maximum of 6 3/4”. The last number is the VAL angle, which instead of being measured from the pin like the drilling angle is, it’s measured from the PAP. This angle is recommended to be between 20 and 70 and it determines how fast the ball transitions through the phases of ball motion. The smaller the number, the quicker it will rev up and transition at the backend, while the larger the number, the slower the revving and slower the transition.