Stefan – don’t think about gear effect in regards to bulge/roll, it’s about how the iron reacts by where the ball is hit on the face. The reason you want to hit it low on the face is because as the impact occurs that low on the face the clubface will essentially deloft even more than what you brought to that impact. So, making up numbers, let’s say you had 4* of shaft lean, by hitting it low on the face, that impact creates force on the bottom of the iron and the top of the iron will want to come down and now you’ll have say 6-8* of shaft lean (again making up numbers). This is why when you “thin” a shot you end up hitting it lower and further in general. Conversely when you hit it high on the face the COG of the head is so low and so far away the face tries to go back and you end up with more dynamic loft and it goes higher/shorter. Similar to when you hit the ball out of a fluffy lie in the rough.
Hit it low on the face to get gear effect? On an iron, where there is no bulge? Huh?
Stefan – don’t think about gear effect in regards to bulge/roll, it’s about how the iron reacts by where the ball is hit on the face. The reason you want to hit it low on the face is because as the impact occurs that low on the face the clubface will essentially deloft even more than what you brought to that impact. So, making up numbers, let’s say you had 4* of shaft lean, by hitting it low on the face, that impact creates force on the bottom of the iron and the top of the iron will want to come down and now you’ll have say 6-8* of shaft lean (again making up numbers). This is why when you “thin” a shot you end up hitting it lower and further in general. Conversely when you hit it high on the face the COG of the head is so low and so far away the face tries to go back and you end up with more dynamic loft and it goes higher/shorter. Similar to when you hit the ball out of a fluffy lie in the rough.
Agree with Jim