Simulator accuracy. - Page 2
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the face on the driver is curved, bulged outward. So what happens is, when the COG is lower on the club it produces a gear effect (cool physics term) that will reduce the spin on the golf ball. Lower on the face the loft is lower than the center, and the loft is higher on the club above the center of the clubface. So when you hit the ball at the center and above, with a lower COG the gear effect takes some spin off the ball. What the SLDR did was move the weight forward. This allowed them to move the weight as low as it can go. The issue though is the closer it gets to the face of the driver the less MOI you get, and it makes the driver a less forgiving club. So some might find the SLDR not as easy to hit straight compared to other clubs.
Lets just put it this way. I hit a 910D2. I use a pretty low spin shaft, and I get 2700 RPM usually. When I hit the SLDR, i was able to get near 2000 RPM. That is crazy for my ball speed.