dcbrad
locked and reloaded
The difference is staggering, the flight is different, the ball speed is different, and on wedges the ball sucks back a ton (good and bad).
Everything was in the sweetspot.
What book are you reading?
It's called Newton on a Tee: A walk through the physics of golf. Some of the stuff I don't think is as accurate, but it has some very good things too.