SkyTrak_Seth , I jus thaw some posts from senior members of this forum discussing the effect of spin decay on ball flight. I recently noticed differences in draw and fade extent going from my ST compared to real life. I think the ST is an awesome product for the price. This is one of the few areas that I see could use improvements. Is it possible for your team to look at this slight difference in spin axis, and potential spin decay as some have mentioned here?
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I agree with this - I hit the ball with tiny cuts and draws outside and it's definitely exaggerate on ST app and more so in tgc... -
I would like to know from members or skygolf if anything can be done to help spin lighting, marking ball or anything to help spin. I don't play sims golf because of this get shots maybe 5 to8 % of time. Shot goes much longer than normal and spins left or right 30 to 40 yards off line not close to normal shot. If you play sims golf when this happens can you erase shot or have a do over in sims golf, but guess just have to play foul balls.Comment
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In TGC, it's OK to rewind a shot, even in this sites tournament series. We aren't responsible for the occasional mis-read.Comment
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Those physics are built into our flight model. You will certainly see less distance on the same shot with cut spin vs draw spin. Is there something specific you are seeing?Comment
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Skytrak's quoted 250 rpm accuracy in side spin is enough to turn a drive with a 5 yard draw/fade into a 15 yard one. Could that be part of what you are seeing? It could also turn a 10 yard draw/fade into a straight shot, but we tend to not think too much is amiss when they're straight. So it exaggerates and under-exaggerates.Originally posted by BWJones View Post
I don't know if SkyTrak quote their accuracies being within two standard deviations, but if so, 1 in 20 shots would exceed the 250 rpm accuracy as well.
Trackman and others estimate 3-4% loss of spin per second in the air - so that's only around 25% of the spin for a good player. Significant and visible in a tracer, but these pro tracers seem to lose more curvature than this suggests. SkyTrak tends to correlate quite well with Optimal Flight, and as OF doesn't mention landing spin, I suspect SkyTrak doesn't cater for spin decay either.Comment
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skytrac_Seth first think I love hitting balls on my skytrak unit, for the most part it works great. spin is a problem some of the time. I lived in mi a lot of years . Have hit a lot balls off mats. mats make some shots bad. If you hit fat shots it will take off distance,and some times turn club over hitting a low hock with a lot of run. I get shots that go high and left or right at times spin numbers of 5,000 back spin with side spin 2,900 more than 1/2 as much side spin with 30 to 40 yds off line with 15 yds more carry. Yes I hit shots on course left and right 5 to 15 yds off line right and left 95 % of time straight shots no big curve. with irons 6 down to wedges hit very little curve on course.Comment
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How so? If all other parameters are the same and only side spin changes from - to +, the end result is the same distance. What people see is a weaker shot on a fade/slice vs draw/hook. Mainly due to ball speed and LA.
Originally posted by SkyTrak_Seth View PostComment
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I was thinking the same thing wbond. Don’t see how th ball would know if the person is right or left handed or why physics would care how the ball speed, launch angle, spin axis, and spin would care if it was a draw or fade. Should identical fade/draw if the axis was just swapped from fade to draw. -
That was a poor answer from my phone and I misread the original question. Correct - considering all other parameters are equal, then a draw and fade should be exact mirror opposites. This can be proven using an emulator in our software and others. Often not the case IRL though as most people tend to launch the fade higher with higher back spin resulting in less distance. Now let me go back to the original question
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Confirms what has been speculated then.
Now the big question, will this be something added to the list for upcoming releases?
I wonder do other flight algorithms have spin decay included or not.Comment
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I can't really comment on the TGC flight model but the Fitness Golf flight model definitely accounts for spin decay. I have only used the Fitness Golf software and TGC software with the SkyTrak and subjectively feel that the ball flight within the Fitness Golf software mirrors my outdoor ball flight better than TGC. However, even within the Fitness Golf software I feel that draws, hooks, fades, and slices are slightly over-exaggerated. I really feel that this may be a function of the hitting mats vs. real grass.
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I would like to keep this discussion going.
SkyTrak_Seth - Is there still consideration on spin decay in your world?
ProTee United - do you do any spin decay calculation in TGC? (my guess is no because I see very similar ball flight in ST and TGC.Comment
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Spin decay has been written about, measured and published for decades. I can remember reading about it in the 80s or 90s. I know there's been experiments on balls with different spin decays and they are always fiddling with that parameter in modern balls for longer flight, curvature etc. It is one of the many differences between modern balls vrs the old as well as amongst modern balls also. It varies with altitude. The comment above about Optimal Flight not modeling spin decay is incorrect. OF models spin decay and always has. Spin decay is routinely modeled in other sports like baseball and tennis etc. Highly recommended for any algorithm wanting to be accurate.Comment
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Originally posted by BWJones View Post
Thanks for bringing it up. Certainly open to exploring if it has potential to increase our flight model accuracy. I will address with our team next week.Comment
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SkyTrak_Seth by my reckoning you have just 10 posts left until,you have to post something very special indeed, Mr 1000. -
No expert on flight modelling here, but do you think maybe the lack of spin decay is reason why ST distances seem to be slightly shorter and draws/slices are more pronounced than IRL esp on longer clubs like driver and 3W? Thanks.
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