John Brodersen
06-23-2010, 02:40 PM
Ball specs – 15 lbs 3 oz, 3.08 oz top weight, and a 3 1/4-inch pin.
The Roto Grip Grenade was punched using the dual angle layout method, 5-inch pin by 60-degree drill angle by 30 degree VAL angle. If you are using the Storm method, the layout is a 5-inch pin, 4 ½-inch mass bias, and a 2-inch pin buffer. An X-hole was not needed and the finish was left OOB.
The Grenade wraps a urethane cover around the Photon core, which is the same core that powers the Riot and Dark Star. It has been many years since I’ve rolled a urethane ball and the same number of years since experiencing the urethane ball motion. One word can describe the ball motion of the Grenade and that word is smooth. With the OOB dull cover the Grenade had a tendency to pick up earlier than I was expecting but once the cover absorbed some oil that earliness went away. Hit and carry were good. Smooth and predictable is what you would expect from a urethane ball and the Grenade delivers both very well. The Grenade will be a condition specific shell (short patterns, low volume patterns, extreme over-under patterns) but it could provide you with a distinct advantage on those conditions.
John Brodersen
The Roto Grip Grenade was punched using the dual angle layout method, 5-inch pin by 60-degree drill angle by 30 degree VAL angle. If you are using the Storm method, the layout is a 5-inch pin, 4 ½-inch mass bias, and a 2-inch pin buffer. An X-hole was not needed and the finish was left OOB.
The Grenade wraps a urethane cover around the Photon core, which is the same core that powers the Riot and Dark Star. It has been many years since I’ve rolled a urethane ball and the same number of years since experiencing the urethane ball motion. One word can describe the ball motion of the Grenade and that word is smooth. With the OOB dull cover the Grenade had a tendency to pick up earlier than I was expecting but once the cover absorbed some oil that earliness went away. Hit and carry were good. Smooth and predictable is what you would expect from a urethane ball and the Grenade delivers both very well. The Grenade will be a condition specific shell (short patterns, low volume patterns, extreme over-under patterns) but it could provide you with a distinct advantage on those conditions.
John Brodersen