GC2

[Dannyj1984]

Our local club has a GC2 and simulator you can hire out so me and a friend are going on Sunday for a bit of a laugh see who can hit each club the furthest etc. I have been reading up on what they can measure and was wondering which figures I should be looking at for my driving? which I am struggling a bit with.
From what I have read I got the following,

I am using a Ping G20 12 degree driver with regular flex. I think I probably need a stiff flex from what I have been told with swing speed around 95-100mph but I am in the process of having lessons so American golf recommended to get some more consistency in my swing before getting fitted for a new driver which seems like good advice.

Ball back spin - looking for under 2500
side spin - not sure about this one I am guessing if you play a draw shot it will have left spin ( I am not really at the level to play draw/fade shots)
Launch angle - above 13 degrees

For general golf shots, should the club head speed increase as you go down your irons? sw lowest speed 5i highest?

It also measures swing path, should this ideally be 0 degrees?

Thanks for any replies I really appreciate your advice.

Danny

 

[Alex1975]

This is what you will see:



The averages are along the bottom in grey. On this day in history the numbers were pretty good and about your swing speed. Launching it about 16.5 and spinning it about 1700. They go a few yards left and roll out well.

If you spin it more you might want to launch it less and vice versa.

Yes your swing gets slower the shorter the club.

Unless the GC2 your using has HMT and every club you use is marked up with silver spots, you will not get any club data, just ball data. So no face and path. Yes if you can get face and path at 0 you will win golf.

 

[the_coach]

Our local club has a GC2 and simulator you can hire out so me and a friend are going on Sunday for a bit of a laugh see who can hit each club the furthest etc. I have been reading up on what they can measure and was wondering which figures I should be looking at for my driving? which I am struggling a bit with.
From what I have read I got the following,

I am using a Ping G20 12 degree driver with regular flex. I think I probably need a stiff flex from what I have been told with swing speed around 95-100mph but I am in the process of having lessons so American golf recommended to get some more consistency in my swing before getting fitted for a new driver which seems like good advice.

Ball back spin - looking for under 2500
side spin - not sure about this one I am guessing if you play a draw shot it will have left spin ( I am not really at the level to play draw/fade shots)
Launch angle - above 13 degrees

For general golf shots, should the club head speed increase as you go down your irons? sw lowest speed 5i highest?

It also measures swing path, should this ideally be 0 degrees?

Thanks for any replies I really appreciate your advice.

Danny

think you would be wise until you know what through the lessons (as you say) just what the comfortable balanced swing motion speed (so an 80% swing effort not 100%) that delivers a decent and reliable sweetspot strike and decent launch conditions has been measured overtime - see what that is first before you get into shaft flex changes - say for instance if the max out swing speed is '100 and a tad' but the contact suffers but the consistent 92, 93, 94, 95 mph, whatever, gives you better quality contact consistently then you really on the cusp of stiff shafts, but reg in many - stiff shafts aren't a necessary requirement to be a good golfer
wait till the swing settles some then get fitted

can be real easy to be confused by all the numbers - the big thing about these numbers is that they are dependent on each other to a large extent

if you just starting out wouldn't stress to much over the numbers or on the shaft flex - unless you know what your comfortable CHS is in balance that delivers a center strike

distance outcome is dominated by CHS efficiently transferred into ball speed and LA, AoA, Spinrate as well as a whole bunch of other stuff all play into that

most important is strike location at 'center' sweetspot (sweetspot is not an 'area' of the face but a 'single point' - think pin point size)

smash factor is the number that relates to how efficient strike is - so if the ball was hit at center
generally an elite golfer with driver will have a smash factor number of around 1.47, 1.48, 1.49, 1.50

optimum ball park launch angle for a CHS of around 95 mph is 13º
optimum ball park ball speed (for the above 2 numbers) would be around 140 mph (these 2 numbers would give a smash factor of 1.47

optimum AoA of the clubhead (again for those above numbers) would be +5º (decent AoA with driver run from level 0º to +5º

optimum spinrate (again for those above numbers) between 2000 - 2200 rpms
all above numbers relate to a center sweetspot strike

but along with all of this also crucial to direction and curvature and height will be the face angle to club head path along with dynamic loft at impact

re path for practical purposes a path from +1 to -1 is considered neutral (a + number is path from the inside and - path from the outside

but say anything from say around +5 to -5 could be a very workable swing path as long as the face angle isn't too way out to whatever path

if you think about it it's extremely difficult for most folks to deliver path with in the tolerances of +1,0,-1
what I mean is if trying to swing at 0 it's very possible to swing one time from the inside, next time from the outside if the face angle with those swings delivered a bunch open or closed again very possible given the ability to control face you will have a game that has both left and right misses so then becomes very difficult to be confident over the shot (particularly with a driver) as to which way the shots going to be traveling

but coming say with a variance of +6 to +3, or a variance of -6 to -3 numbers just an example (with the relevant decent face angle control to compliment either swing paths) you less likely to miss consistently on both sides

but if the path are a good ways from inside or outside so say +9,+10,+11 (in to out) or -9, -10, -11 (out to in) starts to get a bunch tricky to get ball to target with any good consistency as the curvature &/or straight offline direction is pretty dramatic and also loses a big bunch of distance

 

[Region3]

Just an addition to what's already been said, but if the GC2 hasn't got the extra attachment at the side (HMT) then it will be guessing your club speed from the ball speed by using a 'normal' smash factor.

The last time I had a go on one I got silly slow swing speeds with an iron because it was still using a typical driver smash factor.

 

[Dannyj1984]

Great replies thanks I think it has the hmt set up also, I was told it records club path as well as all the ball characteristics like I said we are going for a bit of a laugh as he isn't quite up to playing on a course and the driving range gets boring. Be interesting to see what numbers I get though I know on the course I drive it about 250-270 with a good contact.

Thanks