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GC QUAD ACCURACY


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#1 legaffer

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Posted 09 October 2018 - 04:19 PM

I had a chance today to try Foresight GC Quad Launch monitor at my local driving Range. However the accuracy of numbers seemed to be off from my usual Trackman Numbers.

1. I was Hitting The shots Indoors
2. The Ball Only had around 2-3 Meters to travel before it hit a net.

My ball speed average for Trackman was around 168MPH, last week, However When using GC Quad tonight my fastest ball speed was 162MPH, I Also seemed to launch the ball much higher than normal and my spin was higher than normal too. The Driving Range have just installed a new Mat With the GC quad machine being a bit lower than the mat.

I was wondering why this could be the case.

1. Does Temperature affect the Ball speed, If it is colder is the ball speed slower?
2. Does it have an effect with the ball only travelling a short distance before hitting a net?
3. If the GC Quad Machine is lower than the Mat does this have an effect?


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#2 jut111

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Posted 09 October 2018 - 04:29 PM

Yes
No
Pretty sure no

You didnít mention if you normally hit on track man indoors as well. If not then Iíd chalk it up to not being accustomed to swinging indoors. If you usually hit on trackman indoors as well Iíd be inclined to trust the gcq numbers over trackman in that environment.

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#3 legaffer

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Posted 09 October 2018 - 04:32 PM

I have been using TrackMan in a bay hitting outdoors so the environment is slightly different.

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#4 legaffer

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Posted 09 October 2018 - 04:37 PM

Do you subconsciously swing a bit slower inside? How big of an effect in ball speed does temperature have?

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#5 jut111

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Posted 09 October 2018 - 04:39 PM

Itís likely more different then you think. It takes some getting used to to let her rip indoors, especially with driver. Iíve hit a ton of balls inside and still canít make a good driver swing. Itís a subconscious thing.  If theyíll let you take the quad outside to put your mind at ease.


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#6 jms31207

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Posted 09 October 2018 - 04:39 PM

https://blog.trackma...ct-ball-flight/

Temperature of you, the air, and the ball when hit make the biggest differences. Also possibly mental due to indoor swinging(Had a huge impact on how I swung the club when I first started hitting indoors), and also might been an issue with that particular unit although I have never heard of this and is the least likely reason.

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#7 legaffer

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Posted 09 October 2018 - 04:45 PM

I was looking through GC Quad FAO and it says

Confirm the device is placed on the same level surface as the ball.

Has anyone noticed inaccuracys with the machine when it is not on the same level as the ball?

As my launch seemed to be much higher than normal.

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#8 300_Straight

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Posted 09 October 2018 - 08:27 PM

I always make better swings outdoors. I've never been on a launch monitor outdoors, but I feel I make my best swings out on the golf course.

I would think height of the unit could have an impact on the readings. You also may have been swinging better on Trackman that day. Don't let that session upset you.
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#9 Gamble Gamble

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Posted 09 October 2018 - 10:16 PM

View Postlegaffer, on 09 October 2018 - 04:19 PM, said:

I had a chance today to try Foresight GC Quad Launch monitor at my local driving Range. However the accuracy of numbers seemed to be off from my usual Trackman Numbers.

1. I was Hitting The shots Indoors
2. The Ball Only had around 2-3 Meters to travel before it hit a net.

My ball speed average for Trackman was around 168MPH, last week, However When using GC Quad tonight my fastest ball speed was 162MPH, I Also seemed to launch the ball much higher than normal and my spin was higher than normal too. The Driving Range have just installed a new Mat With the GC quad machine being a bit lower than the mat.

I was wondering why this could be the case.

1. Does Temperature affect the Ball speed, If it is colder is the ball speed slower?
2. Does it have an effect with the ball only travelling a short distance before hitting a net?
3. If the GC Quad Machine is lower than the Mat does this have an effect?
  • yes, definitely
  • no it does not matter to the machine, however if you are too close there may be a psychological "limiter" in your mind which keeps you from swinging freely.  Ask most people who have their own sims in their house, generally it takes a month or so to get your club speed back up to normal "on course" levels
  • as long as the GCQuad is level to the ground you should be fine


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#10 wadesworld

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Posted 10 October 2018 - 12:26 AM

GCQuad is supposedly slightly more accurate indoors than Trackman.


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#11 legaffer

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Posted 10 October 2018 - 05:05 AM

How important is it to GC quad results for the machine. To be perfectly level and flat?

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#12 Golfbeat

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Posted 10 October 2018 - 06:18 AM

It should ideally be level but the GC Quad is extremely accurate so it is most likely the indoor effect which a number of people suffer from, especially in the beginning.
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#13 legaffer

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Posted 11 October 2018 - 10:56 AM

Will the launch angle be off if the machine is not level?

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#14 Z1ggy16

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Posted 11 October 2018 - 11:02 AM

View Postjut111, on 09 October 2018 - 04:39 PM, said:

It's likely more different then you think. It takes some getting used to to let her rip indoors, especially with driver. I've hit a ton of balls inside and still can't make a good driver swing. It's a subconscious thing.  If they'll let you take the quad outside to put your mind at ease.
1000% this. My swing indoors to outdoors is totally different and it's mental for sure. Also, indoors I can't seem to chip.. like... I have chipping yips indoors. Shanks, hosel rockets.. you name it. Outside though, and it goes away completely.

I'd wager you're swinging differently.
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#15 sprcoop

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Posted 11 October 2018 - 11:37 AM

View PostZ1ggy16, on 11 October 2018 - 11:02 AM, said:

View Postjut111, on 09 October 2018 - 04:39 PM, said:

It's likely more different then you think. It takes some getting used to to let her rip indoors, especially with driver. I've hit a ton of balls inside and still can't make a good driver swing. It's a subconscious thing.  If they'll let you take the quad outside to put your mind at ease.
1000% this. My swing indoors to outdoors is totally different and it's mental for sure. Also, indoors I can't seem to chip.. like... I have chipping yips indoors. Shanks, hosel rockets.. you name it. Outside though, and it goes away completely.

I'd wager you're swinging differently.

I think I also have a bit of that indoor psychological fear thing going on that causes all manner of mishits. Just trying to steer the club head at the ball would have to reduce my swing speed some.

It's fun to be topping, shanking and fatting shot after shot in the PGA SuperStore bay.

I really want to try Top Golf but dreading it for this reason.  It will probably end up being a self fulfilling prophecy.


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#16 Z1ggy16

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Posted 11 October 2018 - 11:49 AM

View Postsprcoop, on 11 October 2018 - 11:37 AM, said:

View PostZ1ggy16, on 11 October 2018 - 11:02 AM, said:

View Postjut111, on 09 October 2018 - 04:39 PM, said:

It's likely more different then you think. It takes some getting used to to let her rip indoors, especially with driver. I've hit a ton of balls inside and still can't make a good driver swing. It's a subconscious thing.  If they'll let you take the quad outside to put your mind at ease.
1000% this. My swing indoors to outdoors is totally different and it's mental for sure. Also, indoors I can't seem to chip.. like... I have chipping yips indoors. Shanks, hosel rockets.. you name it. Outside though, and it goes away completely.

I'd wager you're swinging differently.

I think I also have a bit of that indoor psychological fear thing going on that causes all manner of mishits. Just trying to steer the club head at the ball would have to reduce my swing speed some.

It's fun to be topping, shanking and fatting shot after shot in the PGA SuperStore bay.

I really want to try Top Golf but dreading it for this reason.  It will probably end up being a self fulfilling prophecy.
Top Golf is like going to the driving range, you're not as enclosed (at least the one I've gone to).

Usually for me indoors, I end up hitting tons of hooks because for whatever reason my path gets insanely in to out. It almost makes me worry that I shouldn't be getting fit indoors... but there's really no other choice. You just need to get fit and do a lot of outdoor testing after to validate the fit.
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#17 jms31207

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Posted 11 October 2018 - 01:08 PM

View Postlegaffer, on 11 October 2018 - 10:56 AM, said:

Will the launch angle be off if the machine is not level?

It is my understanding that the GCQ has an auto-leveling device inside it(don't quote me), and it definitely has auto-alignment.

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#18 Golfjack

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Posted 11 October 2018 - 10:30 PM

I've never heard of the GC Quad not being accurate.  You can literally even bring it on the course or grass range.  Maybe they all have their quirks though.  I have heard of Trackman being a little more generous in clubhead speed measurements.  That said, pretty cool indoor range to have a GC quad.  Or is this just for lessons?
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#19 LEO MODE

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Posted 11 December 2018 - 12:43 PM

You can look at my report below but Ball Speed is closely identical between two launch monitors, so likely GCQ is not wrong and you just had an indoor effect, except that only driver shot carry distance is extremely inflated if your spin was less than 2200rpm. But Ball speed would be very accurate.

http://www.golfwrx.c...s-gc2hmtgcquad/

Edited by LEO MODE, 11 December 2018 - 02:14 PM.


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#20 CaddiesFault

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Posted 11 December 2018 - 02:08 PM

Hey,

I have a GCquad indoors in my golf shop. The device is incredibly accurate, however most people who are not used to hitting indoors argue that they normally hit it farther and the machine is incorrect. Ive taken it out to a par 3 and tracked its yardage compared to actual and it was within 2 yards on every shot.

I actually hit the ball further indoors now. Ive been doing it regularly in the winter for 5+ years so im more than comfortable, actually too comfortable. I don't have to chase the errant 110% swing results around the course...

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#21 LEO MODE

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Posted 11 December 2018 - 02:12 PM

View PostCaddiesFault, on 11 December 2018 - 02:08 PM, said:

Hey,

I have a GCquad indoors in my golf shop. The device is incredibly accurate, however most people who are not used to hitting indoors argue that they normally hit it farther and the machine is incorrect. Ive taken it out to a par 3 and tracked its yardage compared to actual and it was within 2 yards on every shot.

I actually hit the ball further indoors now. Ive been doing it regularly in the winter for 5+ years so im more than comfortable, actually too comfortable. I don't have to chase the errant 110% swing results around the course...

Iron carry algorithm is good and should be within 5yds at most but not the driver carry distance shot on a low spin (less than 2200rpm). It's inflated at least 10+yds further and I've seen it as high as 25yds further than for instance Trackman outdoor and various top mathematical ball flight algorithm model. I have a few data samples to back those up and it's been a known issue by Foresight and engineers are aware of it to resolve it. Flightscope Optimizer also has the same issue. It's due to being Apex calculated much higher than actual.

Edited by LEO MODE, 11 December 2018 - 02:13 PM.


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#22 LEO MODE

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Posted 11 December 2018 - 02:16 PM

View PostGolfjack, on 11 October 2018 - 10:30 PM, said:

I've never heard of the GC Quad not being accurate.  You can literally even bring it on the course or grass range.  Maybe they all have their quirks though.  I have heard of Trackman being a little more generous in clubhead speed measurements.  That said, pretty cool indoor range to have a GC quad.  Or is this just for lessons?

In fact, Trackman club head speed is less generous because it outputs lower speed than GCQ and thus creates higher smash factor. But they both measure club head speed in different point in time and Trackman seems to be more aligned vs research machines but all in all club head speed is relative to how it's measured and wouldn't really matter which way you go about it.

Edited by LEO MODE, 11 December 2018 - 02:31 PM.


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#23 legaffer

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Posted 11 December 2018 - 02:22 PM

Was thinking the driving carry was maybe slightly exaggerated as other day I hit a

Launch: 15.8
Spin rate: 2012
Ball speed: 167.5
Carry: 309
Total:333

I know GC Quad has a thermometer on it, how does this work does that calculate the distance to the temperature on the day? Or does it regulate the distance to an average temperature? Also I have noticed efficiency or smash factor, seems to be really low with GC Quad compared to TrackMan, I know this is because clubhead speed is slightly higher with Gc QUAD,  however I canít seem to get a smash above 1.43 with GC QUAD but average around 1.49 with TrackMan. It is really cold in Scotland just now Iím wondering if temperatures being extremely low, if that effects of ball speed off of the club face? As I have had much higher ball speeds.

Edited by legaffer, 11 December 2018 - 02:26 PM.


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#24 LEO MODE

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Posted 11 December 2018 - 02:28 PM

View Postlegaffer, on 11 December 2018 - 02:22 PM, said:

Was thinking the driving carry was maybe slightly exaggerated as other day I hit a

Launch: 15.8
Spin rate: 2012
Ball speed: 167.5
Carry: 309
Total:333

I know GC Quad has a thermometer on it, how does this work does that calculate the distance to the temperature on the day? Or does it regulate the distance to an average temperature? Also I have noticed efficiency or smash factor, seems to be really low with GC Quad compared to TrackMan, I know this is because clubhead speed is slightly higher with Gc QUAD,  however I can't seem to get a smash above 1.43 with GC QUAD but average around 1.49 with TrackMan. It is really cold in Scotland just now I'm wondering if temperatures being extremely low, if that effects of ball speed off of the club face? As I have had much higher ball speeds.

Exactly what I said above. As you can see your spin is 2000rpm so after running in a ball flight algorithm the carry should be around 290yds, so a rough 20yds inflation there.

Temperature barely has any effect on the carry distance and altitude should only have some effect when it's like 5000ft more.

Lastly, with Foresight you would have a hard time reaching to 1.45 smash factor because club head speed is measured more faster than trackman, generally about 3-5mph faster. But as I said, Ball Speed is extremely close to Trackman so it's more about carry distance and not ball speed that GCQ is erroneous on.

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#25 legaffer

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Posted 11 December 2018 - 02:29 PM

View PostLEO MODE, on 11 December 2018 - 02:28 PM, said:

View Postlegaffer, on 11 December 2018 - 02:22 PM, said:

Was thinking the driving carry was maybe slightly exaggerated as other day I hit a

Launch: 15.8
Spin rate: 2012
Ball speed: 167.5
Carry: 309
Total:333

I know GC Quad has a thermometer on it, how does this work does that calculate the distance to the temperature on the day? Or does it regulate the distance to an average temperature? Also I have noticed efficiency or smash factor, seems to be really low with GC Quad compared to TrackMan, I know this is because clubhead speed is slightly higher with Gc QUAD,  however I can't seem to get a smash above 1.43 with GC QUAD but average around 1.49 with TrackMan. It is really cold in Scotland just now I'm wondering if temperatures being extremely low, if that effects of ball speed off of the club face? As I have had much higher ball speeds.

Exactly what I said above. As you can see your spin is 2000rpm so after running in a ball flight algorithm the carry should be around 290yds, so a rough 20yds inflation there.

Temperature barely has any effect on the carry distance and altitude should only have some effect when it's like 5000ft more.

Lastly, with Foresight you would have a hard time reaching to 1.45 smash factor because club head speed is measured more faster than trackman, generally about 3-5mph faster. But as I said, Ball Speed is extremely close to Trackman so it's more about carry distance and not ball speed that GCQ is erroneous on.

I was wondering more if temperature had an effect on the energy transfer between ball and club face as ball would be freezing here in Scotland.

Edited by legaffer, 11 December 2018 - 02:30 PM.


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#26 legaffer

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Posted 11 December 2018 - 02:32 PM

View Postlegaffer, on 11 December 2018 - 02:22 PM, said:

Was thinking the driving carry was maybe slightly exaggerated as other day I hit a

Launch: 15.8
Spin rate: 2012
Ball speed: 167.5
Carry: 309
Total:333

I know GC Quad has a thermometer on it, how does this work does that calculate the distance to the temperature on the day? Or does it regulate the distance to an average temperature? Also I have noticed efficiency or smash factor, seems to be really low with GC Quad compared to TrackMan, I know this is because clubhead speed is slightly higher with Gc QUAD,  however I canít seem to get a smash above 1.43 with GC QUAD but average around 1.49 with TrackMan. It is really cold in Scotland just now Iím wondering if temperatures being extremely low, if that effects of ball speed off of the club face? As I have had much higher ball speeds.

My ball speeds seem to be around 5mph faster on average on TrackMan than GC quad, but I am guessing that could be the indoor effect or the minus tenperatures here in winter.

Edited by legaffer, 11 December 2018 - 02:33 PM.


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#27 LEO MODE

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Posted 11 December 2018 - 02:33 PM

View Postlegaffer, on 11 December 2018 - 02:32 PM, said:

View Postlegaffer, on 11 December 2018 - 02:22 PM, said:

Was thinking the driving carry was maybe slightly exaggerated as other day I hit a

Launch: 15.8
Spin rate: 2012
Ball speed: 167.5
Carry: 309
Total:333

I know GC Quad has a thermometer on it, how does this work does that calculate the distance to the temperature on the day? Or does it regulate the distance to an average temperature? Also I have noticed efficiency or smash factor, seems to be really low with GC Quad compared to TrackMan, I know this is because clubhead speed is slightly higher with Gc QUAD,  however I can’t seem to get a smash above 1.43 with GC QUAD but average around 1.49 with TrackMan. It is really cold in Scotland just now I’m wondering if temperatures being extremely low, if that effects of ball speed off of the club face? As I have had much higher ball speeds.

My ball speeds seem to be around 5mph faster on average than GC quad, but I am guessing that could be the indoor effect or the minus tenperatures here in winter.

Oh yes, it should have nothing to do with GCQ but more with your condition in that day. I for instance hit slower indoor and my ball speed is lower therefore because my ceiling is not high. Just be mindful about inflated driver carry distance on GCQ whether you're indoor/outdoor and you should be golden.

Edited by LEO MODE, 11 December 2018 - 02:34 PM.


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#28 Krt22

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Posted 11 December 2018 - 03:27 PM

View PostLEO MODE, on 11 December 2018 - 02:28 PM, said:

View Postlegaffer, on 11 December 2018 - 02:22 PM, said:

Was thinking the driving carry was maybe slightly exaggerated as other day I hit a

Launch: 15.8
Spin rate: 2012
Ball speed: 167.5
Carry: 309
Total:333

I know GC Quad has a thermometer on it, how does this work does that calculate the distance to the temperature on the day? Or does it regulate the distance to an average temperature? Also I have noticed efficiency or smash factor, seems to be really low with GC Quad compared to TrackMan, I know this is because clubhead speed is slightly higher with Gc QUAD,  however I can't seem to get a smash above 1.43 with GC QUAD but average around 1.49 with TrackMan. It is really cold in Scotland just now I'm wondering if temperatures being extremely low, if that effects of ball speed off of the club face? As I have had much higher ball speeds.

Exactly what I said above. As you can see your spin is 2000rpm so after running in a ball flight algorithm the carry should be around 290yds, so a rough 20yds inflation there.

Temperature barely has any effect on the carry distance and altitude should only have some effect when it's like 5000ft more.

Lastly, with Foresight you would have a hard time reaching to 1.45 smash factor because club head speed is measured more faster than trackman, generally about 3-5mph faster. But as I said, Ball Speed is extremely close to Trackman so it's more about carry distance and not ball speed that GCQ is erroneous on.

Titleist says 1.5% less carry for every 20* reduction in temp.

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