## Friday, November 6, 2009

After giving a synopsis of D-Plane and Trackman numbers, I'll go into some of the questions I've received.

1. What exactly is 'swinging left?'

All the golfer does is move the plane line to the left of the target. If the golfer wants to hit it dead straight with an iron, they should aim the clubface at the target and move the plane line slightly to the left depending on their angle of attack. For instance, if a golfer were to get on a plane board (pic below), the plane line is at the base of the plane board. The golfer should swing along the plane board. Using D-Plane to hit it straight, the golfer would want to aim the face at the target and aim the plane board slightly left of the target. It's almost the setup to hit a fade according to the old ball flight laws.

2. What's the difference between swinging left and coming over the top and aiming left?

The over the top move is when the golfer gets above the plane. They 'bend' the plane line instead of staying on the plane. The reason there's talk about 'aiming left' is that most golfers 'swing along the lines of their body.' So if you want to swing left, it's advisable to aim left to make it easier to accomplish that. But remember, *if* you can hit up with your driver, then you need to 'swing right' to zero out the path. Ben Hogan's stance diagram in his book '5 Lessons' was so brilliant because it shows about where the golfer's feet should be aligned with each club in the bag in order to 'zero out' the 'true path.' Basically I can still hit the inside-aft part of the golf ball and still 'swing left.' However, if I come OTT, then I do not hit the inside-aft part of the golf ball.

The reason why Hogan's diagram works so well is because the AoA gets shallower with the longer the club (usually). A golfer with a -6* AoA with a SW is likely to have a much shallower angle of attack with a 6-iron. And then they are likely to have a much shallower AoA with a 3-wood. So as that AoA shallows out, the horizontal plane moves more towards the right.

3. Why do some instructors want you to eliminate 'shaft lean?'

That's something that golf instructors need to be careful with. Shaft lean = angle of attack. More shaft lean means steeper AoA. So, if you have a lot of shaft lean with an iron, in order to avoid pushes and hooks you need to start swing more left to counter that steeper AoA.

With a driver, it's been basically noted that hitting up with the driver WHILE doing it with shaft lean really decreases your margin for error. Now, Lee Trevino was a great driver of the ball and had a lot of shaft lean, but he clearly hit downward with the driver.

The tradeoff of swinging down with the driver is that you lose distance. Changing from -3 to +3* AoA with the driver can be a difference in about 40 yards even with the same clubhead speed. So, if you cannot get rid of a good amount of shaft lean with the driver and still want to hit it far, I would suggest trying to increase clubhead speed instead of trying to 'optimize driver distance' by hitting upward with the driver.

3JACK

Kevin said...

I can relate to your description Richie. Feel from Mechanics...

"Swing left." How far left? Once you start "feeling" swinging left you will take it too far and start getting under the plane too much. How do you get back to the proper plane?

Homer Kelley got it right. Swing up the plane after low point. That is "swinging left" the way God intended. :-)

Teaching someone to swing back up the plane using a plane board is teaching them the proper mechanics and ingraining feel from mechanics. That is the description I like.

I believe the old circle geometry we learned from the book, contact before low point, swinging down, out, forward, teaches us to hit a little bit of a push draw, as long as we are setting up with the clubface a little open to the path. Nothing wrong with that at all, in fact that's the basis of S&Ts point of tangency. Teaching this properly would help rid the world of slicers...

Want to hit it dead straight, sounds like we just realign the machine a little left (10-5-D OPEN-OPEN) and follow Mr. Kelley's principles of geometry.

Kevin

Rich H. said...

I agree with the concepts. If somebody told me that it feels like when they 'swing left' they feel like they are trying to hit a tiny fade, then I wouldn't argue with that.

There was a post by Kevin Shields going over his Trackman numbers and he called the horizontal plane the 'plane line.' IMO, if you're a good golfer who doesn't flip and has a -4* angle of attack with a 7-iron, then you need to rotate the plane line -2* left. I'd like to create a video someday showing the target line and a plane line rotated about -2* left. I really think that is very miniscule. Probably important to note, but IMO...WAY too much emphasis on swinging left by golfers who need to work on not coming OTT and getting a FLW first. And if you're a flipper, you're looking at an AoA of about -1*, so the plane line would need to be about -0.5*. That has to be almost impossible to really see. I think all of this explains why so many good players tend to hit draws.

Hi Rich, the question I have is this...is it possible to determine AoA without the aid of Trackman. I would love to own a trackman or even just have access to one. However, here in Poland there is no chance just yet. I was thinking a rough estimation could be done by using a high speed camera set at ground level directly opposite the ball in a FO position and measure it using swing analysis software. What do you think?

Rich H. said...

I'm sure that somewhere down the road we'll come up with a cheaper way to determine the AoA. I have no idea how one could determine it without Trackman or that type of technology.

Trackman is a Denmark based company I believe, so getting one over in Europe is not impossible. But the cost makes it very difficult.

Costs \$28,000 (US Dollars) for Trackman along with a \$300 a month fee.

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