Swing speed to loft ratio?

[mont86]

On one the message boards I visit, someone posted a chart on swing speed to loft of the club to shaft stiffness.
What I want to know is why does someone with a fast swing speed need
a lower loft club. I can understand needing a stiffer shaft, but I don't get why they need or use a lower loft.

[lgskywalker37]

Re: Swing speed to loft ratio?

On one the message boards I visit, someone posted a chart on swing speed to loft of the club to shaft stiffness.
What I want to know is why does someone with a fast swing speed need
a lower loft club. I can understand needing a stiffer shaft, but I don't get why they need or use a lower loft.

the faster the swing speed the more the shaft will kick and get the ball higher..... so you have choices, you can get a stiffer shaft or a shaft with a higher kickpoint, or you can keep the shaft, but get a lower lofted club. to get a disired launch angle. same for reverse if your swing is too slow and you can't get the ball in the air get a flex shaft or a shaft with a low kickpoint or a high lofted head

[LowPost42]

Re: Swing speed to loft ratio?

On one the message boards I visit, someone posted a chart on swing speed to loft of the club to shaft stiffness.
What I want to know is why does someone with a fast swing speed need
a lower loft club. I can understand needing a stiffer shaft, but I don't get why they need or use a lower loft.

IIRC, it's a development from the world of Long Drive. The physics of ball flight say that there is an ideal spin rate and launch angle (and IIRC, those numbers are 2400 rpm and 14°, respectively). Now, lower lofts produce less spin. So, to maximize distance, if you can create a 14° launch angle, you find the loft that gets you 2400 rpm. This, as stated, now becomes a launch monitor issue. You hit heads until you can dial in your ideal rpm, note the true loft, and play that. So for exceedingly fast swing speeds, they can generate the required spin, with a much lower loft - maximizing distance.

[lgskywalker37]

Re: Swing speed to loft ratio?

IIRC, it's a development from the world of Long Drive. The physics of ball flight say that there is an ideal spin rate and launch angle (and IIRC, those numbers are 2400 rpm and 14°, respectively). Now, lower lofts produce less spin. So, to maximize distance, if you can create a 14° launch angle, you find the loft that gets you 2400 rpm. This, as stated, now becomes a launch monitor issue. You hit heads until you can dial in your ideal rpm, note the true loft, and play that. So for exceedingly fast swing speeds, they can generate the required spin, with a much lower loft - maximizing distance.

i have heard that 14* 2400rmop too, but from using similators (which i think are pretty acurate) and seeing real life numbers (from long driv comps) i think it as much better to get 1300-500rpms and a launch angle over 25*. they carry about 5 yds shorter than if you did have the 14/2400 but the roll after that is about 25yds.

[LowPost42]

Re: Swing speed to loft ratio?

i have heard that 14* 2400rmop too, but from using similators (which i think are pretty acurate) and seeing real life numbers (from long driv comps) i think it as much better to get 1300-500rpms and a launch angle over 25*. they carry about 5 yds shorter than if you did have the 14/2400 but the roll after that is about 25yds.

I'd like to develop some software (rather than buy it), to simulate these conditions. Now, IMO, I'd rather have an all-carry distance, as I consider roll too unpredictable. Just like when you attack a pin, and it carries to the flag, then rolls away

But you'd have to have a seriously positive angle of attack (AoA) to be able to generate a 25° LA, and a 'tour' swingspeed, I would figure. (~ 110 MPH or more).

[lgskywalker37]

Re: Swing speed to loft ratio?

I'd like to develop some software (rather than buy it), to simulate these conditions. Now, IMO, I'd rather have an all-carry distance, as I consider roll too unpredictable. Just like when you attack a pin, and it carries to the flag, then rolls away

But you'd have to have a seriously positive angle of attack (AoA) to be able to generate a 25° LA, and a 'tour' swingspeed, I would figure. (~ 110 MPH or more).

here is the simulator i use:
http://www.sonicboomgolf.com/virtual...h_monitor2.php

it is no tom wishon, but i find it to be a denectly accurate softare, and its free!.

i carry it about 265 so i think my SS is at leat 110mph. i would also bet if i had a -5* loft i could probly launch the ball at a 15* angle. i do have a huge spind tilt and AoA. too bad lofts that low are not legal, i would get some serios foward roll and top spin with that, lol.

[LowPost42]

Re: Swing speed to loft ratio?

Sonic Boom has also setup a widget, although I don't remember the URL. It's the same kind of thing, but works only on LA, Ball speed, and Spin rate. But it does give you so ideals to aim for.

I wish there would be one for swing speed, but then I guess they have to figure out what your 'smash factor' is, and assume that it's maximized...

[lgskywalker37]

Re: Swing speed to loft ratio?

Sonic Boom has also setup a widget, although I don't remember the URL. It's the same kind of thing, but works only on LA, Ball speed, and Spin rate. But it does give you so ideals to aim for.

I wish there would be one for swing speed, but then I guess they have to figure out what your 'smash factor' is, and assume that it's maximized...

don;t remember the URL??? isn't that the URL above in my other post?

and yea, smash factor varies too much, that is why ball speed is better.

i have never seen a smash factor higher than 1.54, so i would say that is max.

[LowPost42]

Re: Swing speed to loft ratio?

don;t remember the URL??? isn't that the URL above in my other post?

and yea, smash factor varies too much, that is why ball speed is better.

i have never seen a smash factor higher than 1.54, so i would say that is max.

Nope http://www.sonicboomgolf.com/distanc...ndashboard.swf

That one.

[james.welsh]

Re: Swing speed to loft ratio?

Lowpost:

Ever se this one?

http://www.ecs.syr.edu/centers/simfluid/red/golf.html

Kinda neat...

[LowPost42]

Re: Swing speed to loft ratio?

Lowpost:

Ever se this one?

http://www.ecs.syr.edu/centers/simfluid/red/golf.html

Kinda neat...

That one is kind of interesting - I hate doing the math to convert MPH to m/s.

[Started2k3]

Re: Swing speed to loft ratio?

That one is kind of interesting - I hate doing the math to convert MPH to m/s.

Multiply MPH by 0.44 to get m/s. Math is fun.

[lgskywalker37]

Re: Swing speed to loft ratio?

But you'd have to have a seriously positive angle of attack (AoA) to be able to generate a 25° LA, and a 'tour' swingspeed, I would figure. (~ 110 MPH or more).

finally went to a launch moitor and found out my avg launch angle is 23-26* and my avg ball speed was in the mid 150's spin rate 3300rpm. the ball went about 160-170 with a 8* stiff shaft 45". then i hit the ball at 16* and 150's and surpisingling the spin rate was lower at 2300's. but they both went about the same distance. so i think i have a normal swing, and a swing for when the wind with me. so i am probly wrong, but i think anything between 14 and 26* with 2100-3700 rpms (if your SS is 150ish) i think the launch angle and rpms isn't really too important.

[SonicBoomGolf]

Re: Swing speed to loft ratio?

Hey guys, glad you found my tools useful!

In the Distance Optimization Dashboard (DOD) you mention above I have a built in swing speed/ball speed converter that estimates ball speed based on your Smash Factor. It also converts the numbers from MPH to KPH and vice versa.

As you guys alread mentioned, the DOD is more of a general guideline tool, but is still pretty accurate. Entering in all the information needed to make the DOD 98%+ accurate would make that file 10MB+!

I also get a lot of question on the accuracy of the models. I can tell you that both the VLM and DOD are very accurate for calculating carry. While it is not 100% due to general humidity and air pressure estimates, I have found that based on actual launch data and distances both tools are about 95%-96% accurate for driver launch data.

I enter in Sean Fister's launch stats for his winning drive of 377 from this year (205 MPH ball speed, 14 degree launch angle, about 2,050 spin rate) into the VLM and get a distance that is about 2 yards shy of his actual carry distance of 373.

Super high launch angles and ball speeds with super low spin rates will definetly optimize distance, but they can be next to impossible to achieve. The calculators assume that you are actually capable of achieving these near-super human launch stats.

P.S. If you guys have any ideas for additional calculators like the ones I have already developed let me know. I love making these types of tools for you guys.

[mattpodger]

Re: Swing speed to loft ratio?

Interestingly (well maybe) i was recently in touch with the guys at Geek Golf, who make long drive components (the Dot.Com This driver head etc) and they have been suggesting to their customers (the mere mortals among us) more loft. A 12* driver is very popular right now.