Callaway Rogue 20 Driver
Callaway Rogue 20 Driver
T h e Jailbreak Effect IN ROGUE, ROGUE DRAW AND ROGUE SUB ZERO DRIVERS
Callaway’s new Rogue drivers – Rogue, Rogue Draw and Rogue Sub Zero – all feature a series of technologies that work together to promote faster ball speed. Two in particular, Jailbreak and X-Face VFT (Variable Face Thickness) technology, support each other in an especially critical way.
" We aligned these technologies to amplify what we call the Jailbreak Effect," said Dr. Alan Hocknell, head of Callaway R&D, "which is all about promoting faster ball speed on both center and off-center hits to help golfers get more average distance on nearly every drive."
THE NEXT GENERATION OF JAILBREAK
Jailbreak’s function, and how it works, remains the same. The bars’ position inside the head, behind the face, effectively stiffens the body to prevent the crown and sole from deforming and bulging outward at impact. That changes how the face behaves at impact, allowing it to focus more energy on the ball. Callaway calls that "Energy Lensing," and it promotes more ball speed for longer distance.
What has changed about Jailbreak is the shape and weight of the bars. Their new, hourglass shape makes them 25% lighter than first-generation Jailbreak bars. This is important because in club design, every gram that can be moved to a place where it contributes to enhanced performance, matters.
ENHANCING THE JAILBREAK EFFECT WITH IMPROVED X-FACE VFT TECHNOLOGY
Callaway’s X-Face VFT technology entails varying the thickness of the face in strategic ways and places to help the face flex faster, especially on off-center hits. In Rogue, we enhanced VFT through a sophisticated optimization process that consists of successive iterations using finite element analysis to simulate the impact of the ball at more than 100 unique impact locations on the face. The thicknesses of every point on the face are incrementally adjusted during each iteration, based on the allowable stress limit of the face material and the face-speed limit established by the USGA.
" A recent addition to this optimization process is a fatigue analysis in which the stress allowables are based on the number of expected impacts at any given location on the face over the life of the club, or what we call the clubface impact probability distribution map," said Evan Gibbs, director of metalwood development. "This map is based on the fact that players tend to impact the clubface more frequently at some locations than at others, which ultimately allows us to further reduce the off-center face thickness in strategic areas to further increase ball speed on the average mis-hit."
RESULT: FAST BALL SPEED FOR LONG DISTANCE ON CENTER AND OFF-CENTER IMPACTS
The overall benefit of Jailbreak Effect in all three Rogue drivers is the promotion of fast ball speed for long distance from a relatively large area of the face, to help golfers attain long distance more often, both on center-face contact and off-center contact.
" That’s a perpetual goal of ours," said Hocknell. "No golfer makes solid impact every time. We continually work to develop new ways to help golfers maximize their distance on every swing, even the imperfect ones."