DeChambeau Up 25 Lbs

[rich_s2]

It's definitely winter lol. What a thread

[oiler45]

Ahh  … no. That is a theoretical approach and it is incorrect. I said basic physics shows that small increases to mass does not equate to large increases in distance. You quoted numbers saying 20g of added club weight will yield 5-6 yards of carry distance. You will have to show me your calculations - I do not want to come across as a know-it-all engineer. Calculate the delta in Force with an incremental 20g of mass and then show the effect on ball speed.

Assume:

Bryson clubhead speed of 120mph (fast - but he's massive now)Both the 200g and 220g clubhead have same COR (.83) as max allowedAcceleration constant - i.e no slowing of clubhead upon contact with ball in both cases.Please use these assumptions and show me an increase of 5-6 yards of carry distance all other factors the same.

Thank-you

[Soloman1]

He pulled his example from a 10 year-old Trackman newsletter discussing smash factor. The anecdotal example in the newsletter was that tour drivers are sometimes slightly heavier than 200g, which would increase the smash factor if the player had the same impact conditions, including clubhead speed. The real-world problem with that assumption is that speed usually drops off as mass increases. The point of the comment in the newsletter was that lower swing speed can produce better impact conditions and therefore more distance, since ball speed can be slightly higher.

He just took the percentage of the difference from the smash factor and multiplied by a rule-of-thumb that 1 mph of speed equals 2 yards of carry.

[c7015]

2.412 lbf @ 200

2.653 lbf @ 220

 

how many lbf for a yard who knows but pretty odd to say that more force will not make an object go further all other things being equal .. take it up with Newton I guess

[bscinstnct]

Alright, now you're being ridiculous

 

Bryson is more like 25% body fat.

[Krt22]

How is the theoretical approach not relevant, when we are discussing a 100% theoretical situation where 1 player is swinging a heavier club at the same exact speed? And how can you say I am incorrect when you have yet to prove me otherwise? And why are asking me to calculate force when that is not required to show the ball speed difference, which is the easiest thing to measure and correlate to distance increase? Doesn't basic conservation of momentum/energy tell us that the final velocity of a ball struck at rest is dependent on the velocity and mass of the object striking it?

Many people think smash factor is simply the ratio between CHS and ball speed, which is very very close to the truth and what LMs measure. But when TM spits out 1.51 we all know (well, perhaps not all) that isn't a real because it's physically impossible based on the physics, and thus those numbers come from how TM measures/calculates CHS (they assume the center of the face). And I am sure plenty of people have tried to increase smash factor and thus asked the question, what is the real upper limit? Well that upper limit can absolutely be calculated and is the only real relevant thing in this theoretical discussion where all else is being held constant

The equation for max achievable smash factor is derived from the equation for a real-world inelastic collision (which impact between the club and ball essential is, with a known COR) and thus is dependent on head weight, ball weight, COR, and spin loft. I calculated the two max achievable smash factors, assuming equal strikes, equal speed, the 220g head will give you ~3mph of extra ball speed (3.12 to be exact, I rounded down). I already calculated the 2 max achievable smash factors, surely you can punch those into your calculator, multiply by 120, and subtract the two to verify for yourself. For driver, ~1.6-1.7 yards per mph of ball speed is the expected extra carry. If you don't believe me, you can punch in the launch conditions into flightscope's optimizer.

Trackman has a newsletter on all of this, fully detailed, very informational. You can find and read it yourself if you desire, but I am not going to spell it out any further for you.

[Krt22]

100% Agree with you here in terms of real world application, there is absolutely an area of diminishing returns in terms of speed decrease vs increasing head weight. But modern CB shafts have shown the math to be true, where one can increase head-weight without sacrificing CHS, and thus gain extra ball speed. Assuming a big brawny guy could swing a 220g head at 120mph he absolutely would hit the ball a bit further all else being the same, the physics is all there, so I would not say the example is anecdotal. The same can be said about going the other way, making the head so light in an attempt to increase speed (or shaft length), while smash factor drops.

[Krt22]

lol wut

[jgonz69]

 

[ThinkingPlus]

If you use the ball speed formula from Dave Tutelman's website you get an increase in ball speed of ~1.7% going from 200 gm to 220 gm clubhead. Assumes Vclub remains the same.

Vball = Vclub * (1 + e)/(1 + m/M) * cos(loft) * (1 - 0.14*miss)

[Krt22]

Yeah that is essentially the same formula trackman uses for theoretical max smash,, only difference is trackman uses spinloft vs dynamic loft and just assumes a perfect strike (a given for theoretical max SF). So 10% more of head weight gives you 1.7% more ball speed, not a huge amount but also not negligible.

[tannyhoban]

I think he should grow a beard and audition for the next edition of Santa Clause. Tim's getting a little long in the tooth.

[Golfjack]

That's weird I have also seen people say mass doesn't matter Also, if you increase the head weight 10% but don't swing it any slower, that's also weird. I know it's easier for comparison, but I'm guessing a golfer can also swing it 1.7% faster probably or more?

[iNeedMoreGolf]

He gained 25 lbs of brain matter yay.... no reallt he looks at least 215.

[kmbean]

He looks terrible.

[J13]

Yeah he looks like he gained a tremendous amount of fat. I'm not sure if he said it or the media just misquoted but the 25lbs of muscle in a few months statement is just reckless. He might have added 2 lbs of muscle during that time and the rest is water, glycogen, and mostly fat. He looks extremely bloated.

 

With that said the only way to add muscle is to consume more calories than you need so my guess is he plans on focusing on strength and weight gain for a year or so then strips off the fat.

[MattyO1984]

I wonder if he will realise what Tiger now seems to have released. The bigger Tiger was, the worse he actually looked. Seemed the same for Bryson.

[J13]

I guess we'll find out.

[bscinstnct]

https://www.golf.com/news/2019/12/11/bryson-dechambeau-presidents-cup-growth/

 

"DeChambeau’s body has transformed so significantly that the Presidents Cup team uniform he was fitted for in May — during the Memorial Tournament — no longer fits. His chest size has increased from 52 to 54 inches, his neck from 17.5 to 18.5 inches, his waist from 34 to 37 inches."

 

Sounds like he gained like 20lbs of fat. Hopefully, some muscle too. Gaining a couple of inches on his waist might be normal if he is bulking but I have no idea why he is bulking in the first place. If the goal is to gain strength, you can do that without getting fat. Even if he wanted to gain some mass to look bigger, he could so that without putting on so much fat.

 

And I'm pretty sure they mean his chest went from 42-44 cause this is a 54 inch chest ; )

 

 

 

[Hankshank]

You thinkig he’s gonna do a Lou?

[ExTrumpet]

 

3" increase in his waist? Dude has overindulged, trying to play us off as stupid.

[Irishman1979]

He’s going to realize that being lean is better than being too bulky in golf. Look at guys like Norman. He has a very small waist and is very lean but muscular. Bryson is carrying around way too much water weight. He needs to lose 15-20 pounds this winter in my opinion.

[Valtiel]

I want Brooks and Bryson to get into a bulk up race until one of them just tips over.

[GoGoErky]

Im

sure guys like stadler, daly, angel cabrera, Koepka and rahm to name a few might disagree

[chigolfer1]

https://golfweek.com/2019/12/10/how-bryson-dechambeau-turned-into-incredible-bulk-presidents-cup/

[MountainGoat]

So far, the results have been pretty clear. He was close to DFL at the Hero, and he's been benched at the PC.

[stingerfade]

But at least he’s hitting it over the range net

[LICC]

DeChambeau lifting weights to bulk up to seek more distance = stupidity.

[stingerfade]

It’s a joke.

Please spare me your reasons why I’ve read enough about it.

[oikos1]

I thought you were interested in facts. What does "stupidity" have to do with it?

 

Fact: Dechambeau says he has gained distance.