Driver vs driver ball speeds

[Ryan5508]

Just something odd that I noticed tonight on the gc2.

With my epic sz my best shots never seen to get much over 160mph ball speed on average. Usually average around 2k spin.

Hitting a friends old rocket balls driver tonight for the first time on a gc2 I noticed much higher ball speeds. Anywhere from 170-178mph. Spin was more or less 3k average.

I can generally hit my epic right at 300 yards outdoors once a round or two. Same thing for on the gc2. So I know that I hit it well. But the difference in speed here is crazy to me.

Does spin or lack of it effect the gc2 Ball speed reading at all? I have used face tape and know I am hitting just above center. Just trying to understand what I may be missing.

[aja]

Not sure that you should be looking at ball speed if the end result - distance is good.

Lower spin generally means more distance for any given ball speed. It's a little more complicated of course and you don't give enough info in your post, launch angle, is the distance total or carry, and so on.

Are you questioning the GC2 accuracy? It's telling you the speed and the spin.

[Ronsc1985]

Does spin or lack of it effect the gc2 Ball speed reading at all? I have used face tape and know I am hitting just above center. Just trying to understand what I may be missing.

No. It simply measures how far the ball has moved in a time slice. Velocity=Distance traveled/time

[TorchRedRob]

Conclusion: Sell him your Epic and take the RBZ in as a trade. I'd take that increase on speed in spite of the spin increase all day.

I have heard of drivers getting nice and springy near the end of their life. I don't know if it accounts for as much as 15 mph, but that RBZ seems to really fit your swing for some reason. I'd trust the GC2 on this one.

[Ryan5508]

I actually hate the rbz driver. It's way shorter distance wise on average than the epic. I was just surprised by the the speed differences between the two. I would have thought ball speed would be a constant between clubs and launch
and spin the difference. Given the same head size, shaft length and flex.

[TorchRedRob]

Yeah, I've never seen such a crazy speed increase between recent drivers. Maybe 2-5 mph tops, but that's about it- and most of that is probably just because it's a different day.

[Yrrdead81]

So you can get some speed differences even with the same model head. Just due to manufacturing differences. If you look at tour issue stuff you will see the sticker on it, look at the ct number. This is a measure of how "hot" the face is (kind of). If you have retail equipment (like most of us) your particular club has a pretty big range that it can be in (relatively speaking).

Ct values also aren't super static. By that I mean this value can change over time, especially if you are swinging >110mph. The older a driver the more you can see some "hot" shots(and cold for that matter). Especially if you have been hitting hard for awhile not only on the course but also indoors for practice and sim golf. But for that extreme a jump in ball speed something else is going on. Either those two clubs are at opposite ends of tolerance and/or there is a serious fitting issue elsewhere.

How are the shaft lengths? Strike? Also when checking strike for comparison use foot spray as opposed to impact tape or stickers. Tape and stickers throw off the numbers due to them reducing spin significantly.