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How much does 1 degree Driver loft change effect spin?
Barfolomew ·
Barfolomew
#worstWRXerPosted: WRX Points: 361Members Posts: 1,808 Platinum Tees
Of course its different for everyone but is there a general idea of how much spin changes when you change the Driver's loft 1 degree? I don't have access to a launch monitor to find out myself....Thanks!
edit: and are the 1 degree steps uniform in spin change....meaning spin change from 9 to 10 is similar to 10 to 11?
edit: and are the 1 degree steps uniform in spin change....meaning spin change from 9 to 10 is similar to 10 to 11?
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Post edited by Unknown User on
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1674
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edit: or am I reading that wrong and its only +100 from 10 to 10.5 not +600??
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Go here
https://flightscope.com/products/trajectoryoptimizer/
And what you believe to be your launch conditions (hopefully you know them) and you can see what spin change does to carry if everything else stays the same.
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Youre reading it wrong. From a 12* head dropping to 10* is 600RPM of spin. You cant really relate the 10.5 std to a 12* turned to a 10* directly, its going to be spinning around the 10* but since there are no spin numbers for the STD loft its not comparable. To do a closer comparison, youd have to jump over to the other std loft and compare it to turning a head there, but since it open and closes face angles, it gets complicated and slightly messier.
10167
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For each 1* difference to loft we change spin with
80 mph club speed = 208 rpm
110 mph club speed = 286 rpm
https://goo.gl/images/zsa8wj
For drivers, we have a average Dynamic loft to launch angle of 0.85 so if we add 1* on loft we raise launch with 0.85* (this factor vary from 0.79 to 0.89, but we can use 0.85 as average)
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10167
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Even if you had a trackman at hand, it would be hard to find this numbers since we are humans and hardly ever get impact on the exact same spot from stroke to stroke.
On drivers, its vertical gear effects who is the ruler of spin, so depending on where we make impact, the same player, club and swing (aoa), can se variables from below 2000 to above 4000 on spin, and a launch angle that can vary up to 3.5*
When we move impact up or down on the axis for vertical gear effect, only 1/8" difference makes a difference to spin of about 240 RPM.
Players with a spin issue most likely get a impact to low on the face, so its easy to fix.
https://images.google.dk/imgres?imgurl=http://www.golfwrx.com/forums/uploads/monthly_07_2014/post1008810194674001404574678.jpg&imgrefurl=http://www.golfwrx.com/forums/topic/1044589loweringspinrates/&docid=yAm947vHT_aA2M&tbnid=wfoPmzOOplNavM:&vet=1&w=466&h=267&source=sh/x/im
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2717
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Can't Launch it and CAN launch it... you will be happy for the extra 300ish RPM !!
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24539
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Where the spin is in RPM, the velocity in MPH, and the loft in degrees
10167
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160 x club speed x spin = loft
???
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24539
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spin = 160 * Vclub * sin(loft)
Keeping in mind that 'loft' is 'spin loft' (the loft the ball "sees" at impact)  not static loft of the head.
Also, it's only valid for lofts < ~45* if memory serves, so not something to use for the shorter clubs.
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10167
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Lets say the player had a center of the face club speed of 100 with his driver, and that club had a static loft of only 6*, and his angle of attack was +5*
(No shaft bending adding dynamic loft)
That gives a spin loft of only 1*, so lets try the formula.
160 x 100 mph club speed x 1* spin loft = 16000 rpm spin
???
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24539
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sin of 1 degree = 0.01745
so: 160 * 100 * 0.01745 = 279 rpm
which is very close to your charts value of 260.
Although to be honest, the article just uses the term "loft" and doesn't really clarify any further. Spin loft is the only loft that makes sense from a physics standpoint.
https://www.tutelman...ing2.php#launch
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I’m not the best at trigonometry or math in general but I got a completely different answer for your numbers. You have to know how to calculate the trigonometric function of an angle. You can’t just multiple the first two numbers together. Doesn’t work like that.
160 x 100 mph x sin(1* spin loft) = 279.24
I’ll make it a little easier for you.
160 x 100 = 16,000
Sin(1) = 0.01745241
16,000 x 0.01745241 = 279.23856
It might be easier to use a more realistic spin number for a diver like 14 or 15. That’s generally where we see amateurs with there Driver according to Trackman research. So take a look at this:
160 x 100 = 16,000
Sin(14) = 0.2419219
16,000 x 0.2419219 = 3,870.7504
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10167
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Yes, Spin loft is what makes sence, but for the math it does not matter.
If we keep "all else equal", 1* static loft =1* dynamic loft = 1* spin loft, so loft is loft..
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24539
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Well keep in mind it's an equation for spin for a given loft. It's not an equation for spin delta given a loft delta. The trigonometry means that the difference between 0* and 1* (279 rpm using the equation) is not going to be exactly the same as the difference between 15* and 16* (269 rpm using the equation)
So in one sense (accurate use of the equation) it does matter. On the other hand, the fact that it's not an exact solution in the first place and only an approximation  means that it doesn't matter all that much. 10 rpm is pretty trivial in practical sense.
1674
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Since I used to skip classes at MIT quite often and I swing above 110 mph I'll just go with around 280 added spin for every 1* loft increase lol....
Howard thats an interesting gear effect diagram of where contact location is on the club face and how it changes spin!
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