TGC seems really penal on side spin

[Js1010]

I always thought the offline in with TGC was a bit off with the short irons as I could see the tracer curving more than seemed real. I know its difficult do curve a Lob Wedge left or right. Can push and pull but hard to curve. I just did a small test of shots today from 60-130 (on my GC2) including the offline yardage for each shot for TGC, GC2, and Optimal Flight Software.

Skytrack Guys - I guess first off need to make sure that TGC is receiving the correct Side Spin number from the unit itself. Not sure if you guys can see the numbers from the skytrack and then make sure they match in the TGC analysis screen.

ballSpeed	V Launch	Ball path	SideSpin	backSpin	TGC Carry	TGC Offline	GC2 Offline	Optimal Flight Offline
69.5	30.4	-2.1	-245	9361	79	-3.7	-4	-3.5
71.7	29.6	-1.9	240	9196	83	-1.72	-2	-2
73.6	28.4	1.1	303	9645	86	2.88	2	2
83.1	27.5	-2	621	9614	103	0.11	0	-1
82.9	27.4	-0.2	343	9839	101	1.51	1	0.9
88.7	22.4	-0.1	649	7898	114	4.21	4	3
92.4	25.1	-2.9	354	8127	119	-3.21	-3	-4
97.4	22.8	-1.4	622	8472	126	2.1	2	1
95.3	23.1	-0.6	679	8638	124	4.12	4	3

based on the above TGC offline numbers from this test seem ok compared to the others. I honestly don't think any algorithm is perfect. Optimal Flight is probably the best but I have hit shots that I don't think the carry was correct on it either. GC2 algo has steadily improved over time but I also think the GC2 still gives bias towards very low spin driver shots where Optimal Flight is on the other end of the spectrum showing them a bit shorter than I would expect.

Would be curious if anyone has done an outside test with GC2 and maybe Ipad App to see how close the GC2 offline number is. It still seems to me that my short irons fly straighter in real life and I miss more as a result of of push or pull. I guess its possible that the visual ball trace in TGC makes it look like its curving more than it is.

I would be curious if someone posted numbers from a decent (well struck) shot where they thought the curvature or offline was way out of wack. I know there are some issues with extreme spin numbers in TGC.

[Js1010]

Did a little more testing - figured I would try hitting longer shots trying to curve them a lot more this time to see if that made a difference. There were a few shots that were shorter clubs that were a couple yards greater offline than OF, otherwise it was pretty close - especially as you get near or over 200 yards (+- 2yds is pretty good).

If anyone wants to post some numbers I will run them through optimal flight and see what it says - its possible there are spin ranges that I didn't touch in my limited testing that could be off more.

ballSpeed	V Launch	Ball path	SideSpin	backSpin	TGC Carry	TGC Offline	GC2 Offline	Optimal Flight Offline
100.8	22.4	0.5	1476	8375	129	11.48		9.5
107.9	20.4	-1	1155	6903	145	10.16		9.2
108.2	21.2	-1.5	1034	7357	142	7.2		6.4
112.4	21	-1	856	6337	153	8.3		8
118.9	18.5	1.9	1537	6119	167	27.68		26.2
122.3	16.7	-0.5	1020	4873	176	15.19		16.5
125.8	17.1	0.3	1156	4854	183	21.3		23
135.1	16.7	-3.7	-308	3461	229	-23.49		-22.9
147.3	13.1	1.5	681	1730	250	33.44		30.1	228	OF Carry
151.4	12.2	1	371	2219	255	18.94		18.2
144.4	14.4	-7.7	-737	2283	235	-55.73		-56.1	228	OF Carry
153.1	13.8	-0.2	-821	2885	253	-29.98		-31.8
160.3	12.9	-0.2	424	2336	278	17.84		17.5	267.8	OF Carry

[st_golfer]

So I did a little subjective testing with the 1.4.1 interface. I hit some shots in Skytrak to get a feel for what was 500, 1000, and 3000 rpm. Then loaded up TGC and played a hole with no wind. Kept rewinding the tee shot and got in about 20 swings. Happy to report that the results were much more in line with what Skytrak showed. I think TGC is a little more penal still but it's much closer to what Skytrak was showing.

[goodmatt78]

I think overall ST records excessive side spin. I recently moved from a fade to a draw and now I am fighting hooks on the ST. On the course this weekend, my worst were draws and no hooks. I am using my ST to figure out how to play a draw with all clubs and the aim points are not carrying over well to the course.

[SwingHarder]

This is something I've been dealing with since getting TGC. The silver lining with it is that I've drastically reduced my side spin in just a little over a month.

I used to have my GC2 show side spin and backspin and can confirm TGC always gets the right numbers.

Recently I switched the display in GC2 to show total spin and spin axis. This is where I believe the error in TGC is. Anything less than 12 degrees is spot on, however the difference between TGC and GC2 goes up dramatically from there, for example a 35 degree spin axis on GC2 is a 50+ degree spin axis on TGC, this drastically exaggerates hook shots.

[aja]

Shooting from the lip here since I don't know what settings are available to those using the GC2 launch monitor with TGC.

I have the ProTee sensor and in the interface settings you can turn on or off and adjust somewhat the 'gear effect' and whether it is used at all. Is it possible that the exaggerated difference in the represented flight in TGC for spin axis above 12 degrees is related to gear effect? If you have the capability to adjust or turn off (or on) the gear effect it may provide some insight as to what is going on with these shots.

Just a thought.

[SwingHarder]

I'm not familiar with the "gear effect". Can you expand on this a bit?

Edit: NM, looked it up. GC2 only looks at ball data, so any impact that gear effect has would be directly measured and not improperly calculated.

[avantix]

I am also very frustrated with almost every shot DRAMATICALLY going left. My usual IRL shot is a draw but in TGC I have to consistently aim 25 yards right to have a shot at the ball going where it needs to. I don't see this in the Skytrak range.

[rsuslow]

I hope this is corrected in future TGC updates. I was seeing a lot of driver slices with my ST in TGC, so I went to the ST Range and hit shots with the driver to compare. The side RPM was generally the same or within 300-400 RPM in both programs. In TGC I was slicing 50 - 60 yards offline, but at the ST Range it was more 20 - 30 (which matches my shots on a real course. I notice this mainly with my driver and 3 wood. I think it's taking distance off. I'm a 230 to 250 hitter with driver, but I struggle to get it over 200 with 95 MPH swing speed.

So I pray it will be corrected because after a week of playing, I love it. Except for my driver and 3 wood.

[iskuo]

Sorry for so many posts today, but I'm having a similar issue in TGC where when I hit a draw it hits the screen right of center as I'd expect, but then on TGC the shot starts on line and then draws ending up further left than I think it should.

Maybe I'm wrong and I'll test it on the skytrak range also, but was this issue ever resolved for you guys?

[jrz]

I've had my suspicions that this might still be an issue, but my miss IRL is a bit of a pull hook so I can't be sure.

[Astrongtower]

Hello,

I am new here but about to buy TGC. I will be buying the $1000.00 version so this is a lot of money. Before I do I have been reading this and make me a little nervous. Would you guys say that you are still generally happy with the TGC and still buy it if you would of known of this issue a head of time?

What would you recommend for me? I am a relatively new golfer that wants to spend a lot of time practicing. IRL outside on the course and driving range but a lot of time indoors as well. Would you still recommend TGC?

Thanks.

[Tekbud]

Can't go wrong with TGC. JNPG is also a good option but doesn't have a full buyout option. there are pro's and con's to both.

[jrz]

Yes, I'd still buy it all over again.

[Jeff Lepak]

Hello,

I am new here but about to buy TGC. I will be buying the $1000.00 version so this is a lot of money. Before I do I have been reading this and make me a little nervous. Would you guys say that you are still generally happy with the TGC and still buy it if you would of known of this issue a head of time?

What would you recommend for me? I am a relatively new golfer that wants to spend a lot of time practicing. IRL outside on the course and driving range but a lot of time indoors as well. Would you still recommend TGC?

Thanks.

My answer would be yes even though I don't have TGC yet. I say that based on everything I have read, researched, googled, etc. over the last 4 months preparing for my sim build out. My LM will be here on Monday and I will be ordering it myself without any hesitation at all. Too many good things being said about it and how much fun it is.

[BradyPett23]

I purchased SkyTrak and TGC earlier this year and I have been blown away with each product. I'd highly recommend both to any serious golfer. I have zero regrets.


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