High spin on irons

[Archv6625]

Hello,
I'm having a bit of trouble with the distances in TGC. I'll hit my 6 iron in the 175-180ish range on a normal day. I'm having quite a bit of trouble hitting it (and the rest of my lower irons) the distances I hit them outside. I'm wondering if the spin calculation is an issue, it seems quite high (see attached).

I high a high ball, as you can see from the launch angle, but I don't hit a particularly high spin shot - my shots will hold most greens but outside of spin milled wedges out of the fairway, I'm not spinning the ball back, even on soft greens. It just sits within a couple feet in any direction of where it lands.

If I run the numbers through optimal flight, it will typically give me a rather short distance, but if I put the spin at a more normal/expected rate - for example 5500 on the 6 iron, the results match reality quite nicely. The cam spin, however that's calculated, actually seems pretty close in most instances to what I would expect. Any suggestions?

Also, any thoughts on the high smash factor? Seems odd to have 1.48 on a 6 iron. I have Bridgestone j36s's, so they aren't some high tech rocket-faced iron.

Thanks.

[aja]

Spin numbers are calculated and / or estimated in ProTee, most likely based on the launch angle that is detected.

I don't use 'cam spin' since I found it to increase the spinrate even more.

I would ask ProTee directly to help understand what is happening with respect to 'spin'.

As for smash factor - that is, and has always been, the ballspeed divided by the clubspeed. Do the math on your data and it comes to just under 1.48. Closer to the theoretical max of 1.5 and you are getting very efficient energy transfer to the ball.

[drewpac]

I stopped using vcam for spin as well because I hit a high ball (without ballooning so not too high of backspin) and was losing distance especially with my driver it would calculate enough spin to lose 20 yrds off of real life yardage. each swing is different so it probably works better for some and not so much for others.

[Richard_Askren]

I believe I set the E6_Spin_Factor in the settings file to 1.5 (default is 2) or something like that to help offset the high calculated spin. It helped get my numbers back closer to what I expect them to be and still be able to take advantage of the Use Vcam for Spin setting.

[aja]

Richard, are you sure that the E6 settings would affect the ProTee numbers when running TGC?

Also, I'm of the belief that the Use Vcam for Spin is a calculated / estimated value at best. The resolution of the cameras isn't such that they could pick up spin.

[dclindner]

If spin is calculated based upon launch angle, then using the Vcam for Spin should provide greater accuracy, at least in the calculated results. It would use the launch angle from the camera instead of a predefined launch angle for the club selected. Gotta be mo betta. :-)

Perhaps Protee could share what formula they use so we can all make some reasonable attempts at tweaking parameters to dial it in, assuming it makes a difference to the outcome.