BrianManzella.com D-Plane Swing Direction Adjustment Calculator

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savydan

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wulsy said:
At the risk of sounding like the dumbest guy on the forum could someone confirm that the distances are measured in yards and whether the formula for the aim adjustment stays the same if the shot length was in metres instead of yards. I'm assuming it wouldn't because the distance/radius would be longer (10%), therefore the length of the arc would be longer, therefore the adjustment greater. Obviously the result would also be greater (10%) just wondering if it could somehow maybe need a differnet formula. Unfortunately its a long time since I did any math(s);)
BTW what is CP short for? (obvious what it means, but not sure what the letters stand for).
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The length of shot and swing direction adjustment are any measurement of length you want as long as they are both the same.

yards, meters, anything you want.
 
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spktho

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wulsy said:
Depends on how much more vertical your shaft is in the latter stages of the downswing (ie coming into impact) than it was at address. If your clubs are fitted to your swing I would guess that VSP and club lie angle+a few degrees would roughly correspond.
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This accounting for shaft droop? I understand that the vsp is "measuring"(Trackman gets the data from ballflight) the sweetspot's vsp and the ball should be hit before the ground. So, is fitting for lie angle really that critical +/- a couple of degrees or more?

Sorry for the clubfitting question in this thread.
 
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wulsy

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Thanks savy. I originally thought it would be the same irrespective of the measurement unit - but then I started to doubt myself becuase I didn't really understand the formula (particulary the 1.75 as a constant??) in the spreadsheet for getting this value. I'll ask my son if he gets it as he is doing a lot of this kind of stuff in school at the moment.
 
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savydan

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Yeah, it's just a ratio so the units don't matter.

Excel likes to work in radians, not degrees, so that is accounted for in the cell formulas.

Personally, if I wanted how many meters (yards) left do you aim?

Say you need to aim 3* left, shot is 200 meters (yards) long.

x = tan(3*) x 200
x = 0.052 x 200
x = 10.4 meters (or yards, or whatever the unit is for the 200 you started with)
 
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wulsy

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spktho said:
This accounting for shaft droop? I understand that the vsp is "measuring"(Trackman gets the data from ballflight) the sweetspot's vsp and the ball should be hit before the ground. So, is fitting for lie angle really that critical +/- a couple of degrees or more?

Sorry for the clubfitting question in this thread.
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If you assume that only the clubface has to be (as much as possible) at right angles to the target line during the impact interval for a straight shot with no ground contact till after the impact interval then theoretically there is no need for the leading edge to be at right angles to the target line also. I guess this is what you are implying, no?

Obviously in order to have the clubface and the leading edge simultaneously at right angles to the target line the leading edge/sole would have to be horizontal (parallel to the ground in general every day talk) and this would require a properly fitted iron. The more loft the greater the divergence would be between face and leading edge relative to the target line if the leading edge was not horizontal.
 
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softconsult

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I was always good at math. A while back I tried to figure out how yards left/right of target for a given number of degrees. I gave up. Trigonometry, and Calculus are at least two of the subjects I never used after High School and College.
 
ggsjpc

ggsjpc

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savydan said:
Yeah, it's just a ratio so the units don't matter.

Excel likes to work in radians, not degrees, so that is accounted for in the cell formulas.

Personally, if I wanted how many meters (yards) left do you aim?

Say you need to aim 3* left, shot is 200 meters (yards) long.

x = tan(3*) x 200
x = 0.052 x 200
x = 10.4 meters (or yards, or whatever the unit is for the 200 you started with)
Click to expand...

Where do radians come into the equation?

I have to run out but I think the 1.75 has a yard system of measurement built into it. I'll check back when I can.

Of course, I could be wrong also.
 
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savydan

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You either stick with degrees or use radians. Don't mix them. Personally I think it's easier to think in degrees. Unfortunately, IMO, Excel likes radians.

Working strickly with degrees you can determine the degrees to aim left or right:

HSP = AoA[tan(90-VSP)]

Example:

AoA = -4*
VSP = 63*

HSP = -4[tan(90-63)]
HSP = -4 x tan(27*)
HSP = -4 x 0.5
HSP = -2.0*
Therefore aim 2* left to zero out path

How many yards left at 200 yards to the target?

x = tan(2*) x 200
x = 0.0349 x 200
x = 7 yards

Aim 7 yards left (or 7 meters left at a 200 meter target)
 
ggsjpc

ggsjpc

New
savydan said:
You either stick with degrees or use radians. Don't mix them. Personally I think it's easier to think in degrees. Unfortunately, IMO, Excel likes radians.

Working strickly with degrees you can determine the degrees to aim left or right:

HSP = AoA[tan(90-VSP)]

Example:

AoA = -4*
VSP = 63*

HSP = -4[tan(90-63)]
HSP = -4 x tan(27*)
HSP = -4 x 0.5
HSP = -2.0*
Therefore aim 2* left to zero out path

How many yards left at 200 yards to the target?

x = tan(2*) x 200
x = 0.0349 x 200
x = 7 yards

Aim 7 yards left (or 7 meters left at a 200 meter target)
Click to expand...

Yes, I was wrong about the .0175 number. Just put in the units needed as you mentioned.

How would you use radians?
 
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savydan

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excel wants all angles expressed as radians - not degrees.

excel can use trig functions, but the angle must be expressed as radians

E.g.

tan(45 degrees) = 1.0

or

tan(0.7854 radians) = 1.0
 
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