Not Mandrin...
THE CLUB MOVE VERY STRAIGHT TOWARD IMPACT!!!
We have it on 1000fps Casio, and other video sources.
It exists.
I saw it that way, too! I guess I think of it as gyroscopic motion...Have read carefully. Out of my depth here, but fascinated to hear the results. Tired enough to hazard a guess though...
A wheel is circular. If you lock the axle and force the whole thing horizontally along a flat road, the same spot of wheel will be in contact with the ground. Massive over-simplification, I know, but you would have to think some lateral movement of the left shoulder relative to the ball would be involved. It is clearly moving laterally anyway as it attached to the pivoting body and isn't frozen in space before, during and after separation.
That's why I thought Tiger was looking so steep for a while.Can a guy with a more upright plane have a longer "flat spot" as Jack Nicklaus said in his book?
As for causes and effects I would guess a guy with a big weight shift would have a bigger flat spot than a guy who leans left on the whole swing. I would say any independent movement from the body versus the arms and club would have an effect on the size of the flat spot.
Professionals i.e. those who are so absurdly sick at this game that they worry about something like spin control.Surely a straight line would give you an AoA of 0*? And what use is that to anyone?
I would think that a flatter swing could have a longer flat spot, but a more upright swing could have a longer "straight" spot...
It ain't pretty, but I've played with Tommy 25 or more times in competition and I've never, ever, seen him mis-hit a shot. He used to have issues with distance control, but he hits it really, really high and really, really straight.
But mostly, he's fearless.
I'm assuming flat spot means straight, not level, correct?
The golf club is NOT moving in either a circle or an ellipse down near and through
impact. No matter what angle you are looking at or measuring. The swing has a very long nearly FLAT spot, and a very long nearly DEAD STRAIGHT spot
as well.
Leon:
Care to elaborate on the parametric acceleration? That sounds interesting.
Parametric Acceleration.
It provides for a steep enough angle to get to the ball, and a shallow enough "flat spot" to keep the clubhead level-ish to the ground so the club doesn't dig, or tilt the D-Plane down too much.
This Parametric Acceleration, a pulling up on the grip so that the grip end stays very close to the belt line to and through impact, speed the club up to get the ball to go far enough when contact is very low on the face (which makes the ball launch lower and spin more).
The golfer as he is applying this Parametric Acceleration, is cutting across the ball hard, probably with a path in the neighborhood of 4 or 5° outside-in, with a face a decent amount open to that.
More friction, more spin, less divot, less chance of skulling, pretty much the cast's arse.
Tour players are stupid good at it.