Big Bertha Alpha 815 Driver
Callaway completes its trio of Big Bertha drivers launches this year with the arrival of two 815 drivers – the 815 and the 815 Black Diamond. The former is designed to appeal to a wider spectrum of golfers than the original Alpha driver, while the latter is aimed squarely at skilled players.
Gravity Core technology, which alters the centre of gravity along a vertical axis, has been retained in both model. The adjustable core, which has a heavier and lighter end, changes spin rates and boosts ball speed off the face. In a change from the Alpha, the two ends of the core are now visible through a hole in the sole so you know what position it’s in. Silver denotes the ‘low’ position, black is the ‘up setting’.
Like the original Alpha, the 815 is constructed from eight different materials, including a forged cup face and composite crown, and features adjustable heel and toe weights, and an adjustable hosel. It has a 460cc head, which increases MOI, and offers less spin, with more forgiveness. The centre of gravity is also slightly higher and further back, while the clubhead is lighter and has more draw bias.
Another new feature is the RMOTO face, which stands for ‘rib motion control’, which removes weight from the face via internal ribs to control the motion of the face and lower the centre of gravity. That weight is then redistributed for more off-centre hit stability than the Big Bertha Alpha. Testing has shown a 1mph increase in ball speed over the original BB Alpha.
The Double Black Diamond is named after the hardest available ski run, and is the lowest-spinning driver in the Big Bertha range. The head is still 460cc, but it’s shorter from front-to-back and has a taller face. It also has more draw bias and a longer gravity core to generate 100rpm less spin in the low position.
The standard model is available in 9°, 10.5° and 12° lofts, with a 53g Fujikura Speeder Motore 565 shaft as standard, while the Black Diamond comes in 9° and 10.5° lofts with a wide choice of custom shafts.
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