VX Launch angle

[cvclub]

I am confused as to why my VX appears to report a lower LA than the impact screen is showing. I have my screen moderately tight but I can see a small dimple when I take a shot. I have a laser pointer that I place on to inclined gauge blocks that are calibrated to 15 and 20 degrees. I can take a variety of clubs and shots and easily see the impact LA . The VX consistently reports several degrees less than actual. Consequently, I can not be sure if a new technique or practice is having the desired effect. FYI,When I play out side my LA appears normal and my carry is within expectations.

Any ideas or suggestions would be appreciated.

[wbond]

Probably a limitation of ceiling mounted system, looking down, the HLA should be quite accurate but VLA is tough to be as accurate since it's read from above. Same can be said for side mounted systems, VLA is very accurate but HLA is tougher. But if it's consistently reading low, you should be able to determine any effect of a change your making.

[damiang]

hmmm - not so sure one can easily dismiss vla as a measure that one can simply compensate for mentally. As it is flight related, a low vla will result in an inaccurate ball flight which is not acceptable.

[cvclub]

Yes, that is my sentiment. So I have been thinking about this some more and IF my actual impact measured LA is 15 degrees and I use a 11 degree driver that should result in a approximate AOA of 4 degrees. I realize there is a bit more to the calc but I would expect something positive, right?

[damiang]

i think the relationship between club loft and vla is more involved than that. there's dynamic loft, aoa, club speed, face impact position, dynamic lie and so on that all have an effect. i agree with bubba22 that comparing to another lm is a good idea to see if your vx has an issue - it certainly isnt a general problem for vx's or they would have all been returned.

[Bubba22]

I don't see that in my setup. I have a GC3 and the Eye Mini and the VLA are within 1 -2 degrees at the most compared to my VX. If you can get another launch monitor to do a check it will be more accurate than screen contact.

[cvclub]

I have seen several comments about VX inaccuracies. Some have concerns about AOA, CHS, distance,etc. I am trying to determine if my configuration may be an issue OR is it possible that the VX has growing pains? I have compared LA using the more modern algorithm (85% D Loft + 15% AOA) and my results show the VX is consistently off by several degrees. Oddly, when I measure the actual launch angle using a laser line from the tee to the impact screen that angle is +/- 1 degree from the calculated algorithm!

My AOA is always negative even when I tilt to a absurd angle. I have always measured my CHS against my red Swing Radar (many people have said the SW is close to trackman and GC) and the VX is consistently3-5 MPH less. Lastly, I am playing outside now and my ball flights, and carry distances are about the same as in past years but the VX is substantially (10-15%) less than reality.

I have had the original PT for years and I am a fan of PT for sure but I am struggling to reconcile some of the VX data with actual results. My last example is when I repeatedly hit my impact screen at 15 Degrees (confirmed and measured) and the VX says something like 9-10 degrees I am suspect. I realize the LA calc is complicated but most articles support the modern algorithm and I would expect the VX to within +/_a degree on average?

Thanks for listening

[drsagacity]

If you compare the Protee with another LM in your sim, that would be best. I did that because I could have sworn my distances on Uneekor were way shorter. Used the gc3 to compare and data was same. Outside with gc 3 the numbers were right on. Turned out to be indoor swing syndrome. Not my Protee numbers match up perfectly with the actual shot tracking data from shotscope.

I have never seen problems with ball flight data. Club data I don’t pay much attention to other than trend changes.

[damiang]

doesnt sound right - some of the club stats such as aoa and dynamic loft arent reliable with the vx and, personally, i tend to ignore those. but vla and chs are important and so i suggest you take this up with protee support as there may be something in your setup or vx unit that is the cause.

[cvclub]

I went to a trackman a couple days ago and some of the numbers were close but the following variables were way off. AOA was 50% more neg with TM. TD distance was 20-30% more with TM. Dispersion was tighter with TM. When I returned home I could not even get close on LA, TD, or dispersion using my VX. FYI, I have 12 foot ceilings and the VX is dropped to about 9' 8 inches.

[Bubba22]

Out of curiosity, was that an indoor or outdoor Trackman? IO or Trackman 4?

[wbond]

Where are you located? Maybe someone from here is near you and has a LM they could bring over to compare.

[cvclub]

Mis step.....AOA was 50% more negative with the VX

[ProTee United]

AOA is a separate measured value which has no effect on measured launch angle and ball speed. All measured values on the VX are measured individually. They have no effect on each other. From all the measured values, ball speed, launch angle, ball direction, total spin and spin axis are used to show the ball flight trajectory.

This means that if you're not seeing the expected flight trajectory, only the values: ball speed, launch angle, ball direction, total spin and/or spin axis could be off for some reason.

We actually got this system returned a couple of weeks ago on our expense because we also did not understand why his launch angle and club speed were off. Of course this is very difficult to validate with just remote support and no other device to compare it with.

At our facility we compared launch angle and ball speed against Trackman4 and GC2. We found that these values were within .2 degrees / 2 mph difference compared to TM4 Indoor. GC2 showed about the same.

We recalibrated his system just to be sure and tested again. When returned the results, according to cvclub, were still the same. Launch angle and ball speed do not match his expectations.

Are you able to get a Trackman4 or GC2 at your house and compare it in your environment?

[cvclub]

I just sent Protee some outdoor trackman data. The TM numbers reflected my real golf experience but when I went back to my VX the BS numbers,AOA,and LA were considerably lower. I am hopeful that PT will have some suggestions. I believe the nexus might be ball speed but I cannot explain why outdoor TM and the VX seem to be so different, about 10 mph less for driver and 7 iron. I do acknowledge PT's effort to help but the simple fact is my real golf experience is not showing up with my VX. Unfortunately I do not know anyone close by for a direct comparison. I live in Traverse City,MI and we are lucky to have a recent Trackman facility.

I can not use my TGC2019 either because the input from the VX is not even close to my real results. I will keep testing and hope for the best.

[ProTee United]

We are going to ask you to return the unit one more time. We will then compare the results with Trackman 4 again and we will record the Trackman4 / VX comparison on video.

[mthunt]

I just sent Protee some outdoor trackman data. The TM numbers reflected my real golf experience but when I went back to my VX the BS numbers,AOA,and LA were considerably lower. I am hopeful that PT will have some suggestions. I believe the nexus might be ball speed but I cannot explain why outdoor TM and the VX seem to be so different, about 10 mph less for driver and 7 iron. I do acknowledge PT's effort to help but the simple fact is my real golf experience is not showing up with my VX. Unfortunately I do not know anyone close by for a direct comparison. I live in Traverse City,MI and we are lucky to have a recent Trackman facility.

I can not use my TGC2019 either because the input from the VX is not even close to my real results. I will keep testing and hope for the best.

Here's a video of a VX and GC2 side by side and there is no launch angle issue. Maybe it's the ball or it's not installed right.

(8) ProTee VX side by side with GC2/HMT 1 dot on same shots - YouTube

[cvclub]

Follow up to my issue with LA data and my VX. PT Support has solved the problem!

They actually built a simulation in their lab and experimented with LA given various tilt forward vs backward and they were able to see a noticeable LA delta similar to my experience. I double checked my hanging pipe mount and that base was level BUT when I attached the metal bracket for the VX I suspect that I torqued the lag screws in no screen facing side first which resulted in a slight tilt down. So ,I loosened all the screws and shimmed the plate with cedar wedges which resulted in a slight up tilt. It seemed like a minute change but it worked.!

My LA testing is much better and closely approximates my Trackman data! I am so grateful for the efforts that PT gave and without their tenacity in discovering the root cause I would have been forced to return the VX, I hope this discovery might help anyone else that may be experiencing LA discrepancies.

I look forward to using the VX to better my game. Thanks PT for being an outstanding partner!

[DivotTool]

So, should I put a level on my VX to make sure it’s level? I also have a 12ft ceiling with a drop down to a little under 10ft. I haven’t paid much attention to Launch Angle but if the unit needs to be absolutely level we should know that.