Originally Posted by O.B.Left
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Thats interesting, Max I'll have to try to get a copy, thanks. Did it talk about an impact interval then as opposed to it being instantaneous?
When you say "65% of the difference between the clubface angle and the path"........are you suggesting that was similar to TGM's at right angles to the leading edge? Leading edge to me implies left to right not up and down. And how would that compare to modern thinking in terms of left to right ? Isnt Trackmans 85% an up and down variance? Not sure, but Id be interested in knowing.
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OB,
Here's something that may help. It's important that you understand that the clubface can point at the target at separation or maximum compression or where ever you think the greatest moment of impact would be - and the ball can leave the clubface at right angles - AND the ball won't fly at the target!! Because it's riding on the clubhead.
Think of another example - The train is moving down the tracks at 100MPH (clubhead) and you throw a ball off the train (clubface) at a right angle to the path of the train at 100MPH - you threw it at right angles to the track- did it fly at right angles to the track? NO, it flew at a 45 degree angle to the track even though it separated from the train at right angles to the track.
There's more there - if you're interested but this creates a condition where on the small picture Homer Kelley's statement that the ball leaves the clubface at practically right angles to the clubface - The ball in relation to the clubface at right angles is dead on! While the ball movement in relation to the target would be flying in a straight line right of the target. The affect of the 65% or 70% or 85% clubface orientation of the ball flight in relation to the target - would be determined by the Vector quantity of the clubhead i.e. the train, based on clubhead speed, efficieny of compression, etc. - Let's say you are going to run over Bucket with your car and you have a slanted snow plow on the front - the more force you can create with the car, and the more he sticks to the blade and rides along with the blade before bouncing off - the more effect the car vector will have on his flight into the ditch.
Does it leave the face at right angles - YES. Does the clubface influence the flight say 70% versus 30% for the clubhead - YES It's not either or. You just need to identify the context in which you are discussing the subject matter at hand.