QB Brock Purdy Thread

Originally posted by blizzuntz:

BREAKING: Caleb Williams says he can make more money returning to USC next season then as a rookie in the NFL and says he can pick what team he wants to go to because of that.😳

Caleb's only 5 team he would play for are the #Cowboys, #Raiders, #Vikings, #Giants, and #49ers. 👀 pic.twitter.com/9TfNYBmrdl

— NFC North News (@NFCNorthNewss) October 2, 2023

Create a custom 49ers jersey ⇨
caleb wants to be our back up

Josh McDaniels right now:

Originally posted by SLCNiner:

Originally posted by YACBros85:

Originally posted by tankle104:

Originally posted by YACBros85:

Originally posted by qnnhan7:

49ers Brock Purdy drops an absolute dime on Brandon Aiyuk deep downfield on a great zone-beater route concept pic.twitter.com/riAkFE7lck

— Brad (@Graham_SFN) October 2, 2023

This back-shoulder throw from 49ers Brock Purdy to Brandon Aiyuk against the left sideline is a thing of beauty pic.twitter.com/71hJhvRrkg

— Brad (@Graham_SFN) October 2, 2023

His footwork is so clean & crisp. On the first play above, Brock is dropping back like a left handed passer and transitions back to his right effortlessly before making the throw.

+ Show all quotes
He did that a few times last game. I believe they all ended up being deep passes to Aiyuk. Lol

He never ceases to amaze me. It almost seems unreal. Can someone pinch me to make sure I'm not dreaming.

Lol, is this from the Imagination Land 3-Part episode/arc?

Originally posted by blizzuntz:

BREAKING: Caleb Williams says he can make more money returning to USC next season then as a rookie in the NFL and says he can pick what team he wants to go to because of that.😳

Caleb's only 5 team he would play for are the #Cowboys, #Raiders, #Vikings, #Giants, and #49ers. 👀 pic.twitter.com/9TfNYBmrdl

— NFC North News (@NFCNorthNewss) October 2, 2023

caleb wants to be our back up

Minnesota might have a chance at him with their current pace. Lol I'd tank if I was them.

Originally posted by SLCNiner:
Just gonna leave this here. I know we've only played 1/4 of the season, but he is getting better and may very well go up. Sorry, don't think Total QBR measures arm strength.


Total QBR All Time

Brady 2007 - 87.0
Manning 2006 - 86.4
Purdy 2023 - 84.5
Rodgers 2011 - 83.8
L Jackson 2019 - 83.0
Brees 2011 - 82.3
Brees 2009 - 82.0
D Garrard 2007 - 80.9
Manning 2009 - 80.7
Mahomes 2018 - 80.3

Boom. So much for regressing to the mean like some people were incessantly claiming when his believers were saying all along that there is WAY more room to get better than teams figuring him out

Brock Purdy is one of a kind.

Originally posted by 5_Golden_Rings:

Originally posted by Chance:

Originally posted by 5_Golden_Rings:

Originally posted by 49erKing:

Originally posted by 5_Golden_Rings:

Originally posted by Giedi:

Originally posted by brodiebluebanaszak:

Originally posted by Giedi:

Originally posted by tankle104:

#49ers QB Brock Purdy has (so far) simultaneously improved in time before throw, air yards per attempt and yards per attempt.

2022: 2.93 seconds, 7.0 air yds/att., 8.4 yds/att.

2023: 2.56 seconds, 7.2 air yds/att., 9.1 yds/att.

Ball out quicker but still gaining more yards.

— Nick Wagoner (@nwagoner) October 2, 2023

Arm is definitely stronger than Montana's.

No not really. They both throw extremely catchable balls on all their different types of throws though. Both elite there.

Disagree, I remember Montana's long balls had more arch to them. Early in Montana's career (Before Rice) he had long ball issues. Which are not a big deal during the early years as he had Wendell Tyler. That Aiyuk 40+ yard throw was a flatter trajectory than Montana's usual deep throws, as I recall it.

Having a lower trajectory on deep balls all the time means your arm isn't as strong, because you have to cut out the wasted motion. You think Russell Wilson has a weak arm? His deep balls are more tear drop than anyone's I've ever seen.

The second the ball leaves your hand, the only forces working on it are gravity and friction. A high arching ball travels a further net distance than a flattened one. It takes more arm to throw more distance. QBs who depend on a flat arc for deep balls probably do not have as strong an arm as those who don't.

HOWEVER, it could also merely be a preference. The QB maybe doesn't anticipate as much as the tear drop guy and has to sling it to get it there in time, or perhaps they're paranoid about the ball taking a long time to get there.

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.
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EDIT: before I get tarred and feathered, I'm not talking about Brock. His arm is plenty strong enough to hit every throw you need to wear a gold jacket. I'm just talking theoretically. If you HAVE to have a low trajectory to throw deep, your arm isn't as strong as someone who can easily do either.

Any science behind this? I think if someone wants to throw deep, if they have the time, and it makes sense, they "naturally" conform to throwing with a higher arc/higher trajectory. I mean that's how I feel when I play catch with the guys. If you're trying to laser it while going deep I think that actually means you have a stronger arm than most.

+ Show all quotes
Yeah. Pythagoras (Extended to curves; the same principle applies, you just add up the infinitesimal distances via a line integral, but it's essentially the same thing. In Euclidean geometry, a straight line is the shortest path between two points.). A high arcing ball travels more distance. As the ball is not getting any additional force as it leaves (basic physics), what you put into it upon release is all it has. So throwing with a high arc doesn't give you some boost. That's not how physics work. Draw a free body diagram. Only gravity and friction are of any consequence once it's released.

So, the high arcing ball is thrown further in actual distance traveled than the low arcing one.

Which means, if you MUST throw with a low arc to get it there, your arm is weaker. (By arm strength I mean how far you can throw the ball, but I see no reason why velocity and distance would be different as a measure of arm strength unless the QB has mechanical problems which make one of either his distance or velocity throws more inefficient.)

Yes, but gravity is the main factor here. If a QB threw the ball on the shortest path, a strait line, it would be impossible arm strength to accomplish on a 40 yard throw. Likewise a QB throwing the ball as high as a skyscraper and it traveling 40 yards in distance. The real measure is ball velocity as it leaves his hands a a tight rope tends to have greater velocity than a moon shot.

Humor me. The critical point is 45 degrees, IIRC.

Horizontal distance is 40 meters.

One QB throws the ball with an angle of 45 degrees. The other throws with a height of 75 degrees. Who has the greater velocity?

The formula for horizontal distance is:
R = [v^2 sin(2α)]/(g)
So v = sqrt [Rg/(sin[2α])]

R = 40.

α for the low arc is: 45 degrees (calculated using the same formula)

α for the high arc is: 75 degrees.

So the HORIZONTAL velocities are, respectfully: sqrt [40m *g/(sin[2*45])] = 19.8 m/s, and sqrt [40m*g/(sin[2*75])] = 39.6 m/s.

The interesting thing with sin is that it's a periodic function. That means there are times when a LOWER trajectory would take more initial velocity than a higher one, and there are times when a HIGHER trajectory would take more initial velocity. You brought up the fact that a zero trajectory would take infinite velocity. That's true. So would a 90 degree trajectory.

So, if the QB is throwing with an arc greater than 45 degrees, each additional degree of arc requires more arm strength. If the QB is throwing with an arc less than 45 degrees, each additional degree of arc REDUCTION requires more arm strength. Russell Wilson appears to throw with greater than 45 degree arc, so the higher he throws it, the more arm strength it takes.

I think that the truth of the matter here is that the biggest factor in arc is QB preference, and if there's a weakness or a strength with a QB who chooses one or the other, it has to be related to vision and anticipation, not arm strength.

It totally has a lot to do with arm strength. It takes a lot more arm strength to throw a deep out on a rope than to throw a lofted pass. All it takes is throwing a few passes to understand that. The main reason to arc a throw rather than throw a frozen rope is catchability and layering the pass through coverage. It's all about velocity vs trajectory.

Originally posted by libertyforever:
Brock Purdy is one of a kind.

I thought DTR was Brock Purdy but in reality he was just Kevin Hogan.

— Nick Pedone (@NickPedone12) October 1, 2023

Yeah, it's annoying how many people keep saying dumb stuff like "anyone can do it on that team"… like what he's doing is special. Lol jimmy couldn't even do what Brock has been as a veteran that was taken in the second round. It's a joke.

but go ahead and waste your picks, team. Lol Brock is just a special player. End of story

Originally posted by blizzuntz:

BREAKING: Caleb Williams says he can make more money returning to USC next season then as a rookie in the NFL and says he can pick what team he wants to go to because of that.😳

Caleb's only 5 team he would play for are the #Cowboys, #Raiders, #Vikings, #Giants, and #49ers. 👀 pic.twitter.com/9TfNYBmrdl

— NFC North News (@NFCNorthNewss) October 2, 2023

caleb wants to be our back up

He has USC bust written all over him.

screen shot this for 3 years from now.

Originally posted by elguapo:

Originally posted by SLCNiner:
Just gonna leave this here. I know we've only played 1/4 of the season, but he is getting better and may very well go up. Sorry, don't think Total QBR measures arm strength.


Total QBR All Time

Brady 2007 - 87.0
Manning 2006 - 86.4
Purdy 2023 - 84.5
Rodgers 2011 - 83.8
L Jackson 2019 - 83.0
Brees 2011 - 82.3
Brees 2009 - 82.0
D Garrard 2007 - 80.9
Manning 2009 - 80.7
Mahomes 2018 - 80.3

Boom. So much for regressing to the mean like some people were incessantly claiming when his believers were saying all along that there is WAY more room to get better than teams figuring him out

PFF has him way down the list. Like 18th or 19th.

By the way, I love him. Just saying it's easy to go find a stat to make a point. He passes my eye test. Works for me. And a million times better than the show the past several years.

Originally posted by Memphis9er:

Originally posted by 5_Golden_Rings:

Originally posted by Chance:

Originally posted by 5_Golden_Rings:

Originally posted by 49erKing:

Originally posted by 5_Golden_Rings:

Originally posted by Giedi:

Originally posted by brodiebluebanaszak:

Originally posted by Giedi:

Originally posted by tankle104:

#49ers QB Brock Purdy has (so far) simultaneously improved in time before throw, air yards per attempt and yards per attempt.

2022: 2.93 seconds, 7.0 air yds/att., 8.4 yds/att.

2023: 2.56 seconds, 7.2 air yds/att., 9.1 yds/att.

Ball out quicker but still gaining more yards.

— Nick Wagoner (@nwagoner) October 2, 2023

Arm is definitely stronger than Montana's.

No not really. They both throw extremely catchable balls on all their different types of throws though. Both elite there.

Disagree, I remember Montana's long balls had more arch to them. Early in Montana's career (Before Rice) he had long ball issues. Which are not a big deal during the early years as he had Wendell Tyler. That Aiyuk 40+ yard throw was a flatter trajectory than Montana's usual deep throws, as I recall it.

Having a lower trajectory on deep balls all the time means your arm isn't as strong, because you have to cut out the wasted motion. You think Russell Wilson has a weak arm? His deep balls are more tear drop than anyone's I've ever seen.

The second the ball leaves your hand, the only forces working on it are gravity and friction. A high arching ball travels a further net distance than a flattened one. It takes more arm to throw more distance. QBs who depend on a flat arc for deep balls probably do not have as strong an arm as those who don't.

HOWEVER, it could also merely be a preference. The QB maybe doesn't anticipate as much as the tear drop guy and has to sling it to get it there in time, or perhaps they're paranoid about the ball taking a long time to get there.

.
.
.
EDIT: before I get tarred and feathered, I'm not talking about Brock. His arm is plenty strong enough to hit every throw you need to wear a gold jacket. I'm just talking theoretically. If you HAVE to have a low trajectory to throw deep, your arm isn't as strong as someone who can easily do either.

Any science behind this? I think if someone wants to throw deep, if they have the time, and it makes sense, they "naturally" conform to throwing with a higher arc/higher trajectory. I mean that's how I feel when I play catch with the guys. If you're trying to laser it while going deep I think that actually means you have a stronger arm than most.

Yeah. Pythagoras (Extended to curves; the same principle applies, you just add up the infinitesimal distances via a line integral, but it's essentially the same thing. In Euclidean geometry, a straight line is the shortest path between two points.). A high arcing ball travels more distance. As the ball is not getting any additional force as it leaves (basic physics), what you put into it upon release is all it has. So throwing with a high arc doesn't give you some boost. That's not how physics work. Draw a free body diagram. Only gravity and friction are of any consequence once it's released.

So, the high arcing ball is thrown further in actual distance traveled than the low arcing one.

Which means, if you MUST throw with a low arc to get it there, your arm is weaker. (By arm strength I mean how far you can throw the ball, but I see no reason why velocity and distance would be different as a measure of arm strength unless the QB has mechanical problems which make one of either his distance or velocity throws more inefficient.)

+ Show all quotes
Yes, but gravity is the main factor here. If a QB threw the ball on the shortest path, a strait line, it would be impossible arm strength to accomplish on a 40 yard throw. Likewise a QB throwing the ball as high as a skyscraper and it traveling 40 yards in distance. The real measure is ball velocity as it leaves his hands a a tight rope tends to have greater velocity than a moon shot.

Humor me. The critical point is 45 degrees, IIRC.

Horizontal distance is 40 meters.

One QB throws the ball with an angle of 45 degrees. The other throws with a height of 75 degrees. Who has the greater velocity?

The formula for horizontal distance is:
R = [v^2 sin(2α)]/(g)
So v = sqrt [Rg/(sin[2α])]

R = 40.

α for the low arc is: 45 degrees (calculated using the same formula)

α for the high arc is: 75 degrees.

So the HORIZONTAL velocities are, respectfully: sqrt [40m *g/(sin[2*45])] = 19.8 m/s, and sqrt [40m*g/(sin[2*75])] = 39.6 m/s.

The interesting thing with sin is that it's a periodic function. That means there are times when a LOWER trajectory would take more initial velocity than a higher one, and there are times when a HIGHER trajectory would take more initial velocity. You brought up the fact that a zero trajectory would take infinite velocity. That's true. So would a 90 degree trajectory.

So, if the QB is throwing with an arc greater than 45 degrees, each additional degree of arc requires more arm strength. If the QB is throwing with an arc less than 45 degrees, each additional degree of arc REDUCTION requires more arm strength. Russell Wilson appears to throw with greater than 45 degree arc, so the higher he throws it, the more arm strength it takes.

I think that the truth of the matter here is that the biggest factor in arc is QB preference, and if there's a weakness or a strength with a QB who chooses one or the other, it has to be related to vision and anticipation, not arm strength.

It totally has a lot to do with arm strength. It takes a lot more arm strength to throw a deep out on a rope than to throw a lofted pass. All it takes is throwing a few passes to understand that. The main reason to arc a throw rather than throw a frozen rope is catchability and layering the pass through coverage. It's all about velocity vs trajectory.

"The interesting thing with sin is that it's a periodic function. That means there are times when a LOWER trajectory would take more initial velocity than a higher one, and there are times when a HIGHER trajectory would take more initial velocity. You brought up the fact that a zero trajectory would take infinite velocity. That's true. So would a 90 degree trajectory."

He agrees with you.... until Newton's 3rd law comes into effect....and at that point you would need more velocity to reach higher to fall farther away.

He has already dragged me into the deep end and left me there to drown....so maybe I am wrong....but I would guess that is what he meant.

I think with a football, what is missing from all this math talk is Rotation and how RPM of the ball effects the stability of the throw so flutter does not waste energy.....

RPM takes hand and arm strength.... things we commonly refer to arm strength.

Originally posted by AB81Rules:

Originally posted by SLCNiner:

Originally posted by YACBros85:

Originally posted by tankle104:

Originally posted by YACBros85:

Originally posted by qnnhan7:

49ers Brock Purdy drops an absolute dime on Brandon Aiyuk deep downfield on a great zone-beater route concept pic.twitter.com/riAkFE7lck

— Brad (@Graham_SFN) October 2, 2023

This back-shoulder throw from 49ers Brock Purdy to Brandon Aiyuk against the left sideline is a thing of beauty pic.twitter.com/71hJhvRrkg

— Brad (@Graham_SFN) October 2, 2023

His footwork is so clean & crisp. On the first play above, Brock is dropping back like a left handed passer and transitions back to his right effortlessly before making the throw.

He did that a few times last game. I believe they all ended up being deep passes to Aiyuk. Lol

+ Show all quotes
He never ceases to amaze me. It almost seems unreal. Can someone pinch me to make sure I'm not dreaming.

Lol, is this from the Imagination Land 3-Part episode/arc?

Yeah 🤣🤣🤣

Originally posted by Crown:

Originally posted by blizzuntz:

BREAKING: Caleb Williams says he can make more money returning to USC next season then as a rookie in the NFL and says he can pick what team he wants to go to because of that.😳

Caleb's only 5 team he would play for are the #Cowboys, #Raiders, #Vikings, #Giants, and #49ers. 👀 pic.twitter.com/9TfNYBmrdl

— NFC North News (@NFCNorthNewss) October 2, 2023

caleb wants to be our back up

He has USC bust written all over him.

screen shot this for 3 years from now.

The ego to think he could replace Daniel Jones.

Originally posted by elguapo:

Originally posted by SLCNiner:
Just gonna leave this here. I know we've only played 1/4 of the season, but he is getting better and may very well go up. Sorry, don't think Total QBR measures arm strength.


Total QBR All Time

Brady 2007 - 87.0
Manning 2006 - 86.4
Purdy 2023 - 84.5
Rodgers 2011 - 83.8
L Jackson 2019 - 83.0
Brees 2011 - 82.3
Brees 2009 - 82.0
D Garrard 2007 - 80.9
Manning 2009 - 80.7
Mahomes 2018 - 80.3

Boom. So much for regressing to the mean like some people were incessantly claiming when his believers were saying all along that there is WAY more room to get better than teams figuring him out

Yeah man, there's nothing to figure out, other than exactly HOW you might want to lose. He is the missing piece to Kyle's offense. Already the best QB has ever worked with.

Originally posted by Memphis9er:

Originally posted by 5_Golden_Rings:

Originally posted by 49erKing:

Originally posted by 5_Golden_Rings:

Originally posted by Giedi:

Originally posted by brodiebluebanaszak:

Originally posted by Giedi:

Originally posted by tankle104:

#49ers QB Brock Purdy has (so far) simultaneously improved in time before throw, air yards per attempt and yards per attempt.

2022: 2.93 seconds, 7.0 air yds/att., 8.4 yds/att.

2023: 2.56 seconds, 7.2 air yds/att., 9.1 yds/att.

Ball out quicker but still gaining more yards.

— Nick Wagoner (@nwagoner) October 2, 2023

Arm is definitely stronger than Montana's.

No not really. They both throw extremely catchable balls on all their different types of throws though. Both elite there.

Disagree, I remember Montana's long balls had more arch to them. Early in Montana's career (Before Rice) he had long ball issues. Which are not a big deal during the early years as he had Wendell Tyler. That Aiyuk 40+ yard throw was a flatter trajectory than Montana's usual deep throws, as I recall it.

Having a lower trajectory on deep balls all the time means your arm isn't as strong, because you have to cut out the wasted motion. You think Russell Wilson has a weak arm? His deep balls are more tear drop than anyone's I've ever seen.

The second the ball leaves your hand, the only forces working on it are gravity and friction. A high arching ball travels a further net distance than a flattened one. It takes more arm to throw more distance. QBs who depend on a flat arc for deep balls probably do not have as strong an arm as those who don't.

HOWEVER, it could also merely be a preference. The QB maybe doesn't anticipate as much as the tear drop guy and has to sling it to get it there in time, or perhaps they're paranoid about the ball taking a long time to get there.

.
.
.
EDIT: before I get tarred and feathered, I'm not talking about Brock. His arm is plenty strong enough to hit every throw you need to wear a gold jacket. I'm just talking theoretically. If you HAVE to have a low trajectory to throw deep, your arm isn't as strong as someone who can easily do either.

+ Show all quotes
Any science behind this? I think if someone wants to throw deep, if they have the time, and it makes sense, they "naturally" conform to throwing with a higher arc/higher trajectory. I mean that's how I feel when I play catch with the guys. If you're trying to laser it while going deep I think that actually means you have a stronger arm than most.

Yeah. Pythagoras (Extended to curves; the same principle applies, you just add up the infinitesimal distances via a line integral, but it's essentially the same thing. In Euclidean geometry, a straight line is the shortest path between two points.). A high arcing ball travels more distance. As the ball is not getting any additional force as it leaves (basic physics), what you put into it upon release is all it has. So throwing with a high arc doesn't give you some boost. That's not how physics work. Draw a free body diagram. Only gravity and friction are of any consequence once it's released.

So, the high arcing ball is thrown further in actual distance traveled than the low arcing one.

Which means, if you MUST throw with a low arc to get it there, your arm is weaker. (By arm strength I mean how far you can throw the ball, but I see no reason why velocity and distance would be different as a measure of arm strength unless the QB has mechanical problems which make one of either his distance or velocity throws more inefficient.)

.
.

EDIT: Just to be clear, however, I do believe that the most likely reason most of the time for why some QBs throw with a low arc and some don't is that the low arc guys either have poorer deep anticipation or don't trust their accuracy and timing as much, or fear that a super fast safety might catch up and make a play. In other words, I think a lot of low-arc deep ball guys COULD throw tear drops but choose not to.

Kaepernick used to throw frozen ropes, I don't think he could put air under it. It takes more strength to throw those low angle passes because you have to put more mustard on it to get the ball to go where you want it. The downside is those balls are much harder to catch. Putting air under it means you don't have to throw it as hard to get it to the target, and the balls are much easier to catch. Josh Allen is probably the best pure arm talent that can do either as needed.

I mean Force is Force,...and angles are angles. I highlighted the angle that's going to get you the furthest distance for a given (equal) force in the chart below. But by all means,...notice the matching pairs of complimentary angles as well. More arc doesn't always equal greater distance. There's a sweetspot.


In highlighting the equivalent of a fastball-type throw and saying it takes more strength,....all you're really talking about or giving "credit" for is the low angle that the thrower has changed to (see 5°-15°). You take the same "strength" that went into the throw, angle it 45°,...and you'll get exactly what you see above, which is a throw with an arc that is the furthest throw possible. Same strength,...further throw. You "feel" like it was stronger because the ball traveled faster on camera.

@ the end of the day, Force still equal mass x's acceleration,....hence,...the reason you have to simply trust a speed gun to tell you what's up,...or do what's alot easier during a football game,...which is see where the ball landed from where it was launched.

But being able to throw fast and hard at a low angle doesn't necessarily mean that that athlete has the athleticism to get you a ball of the same speed with a 45° angle throw. "Arm angles" really are everything.

Originally posted by SLCNiner:

Originally posted by AB81Rules:

Originally posted by SLCNiner:

Originally posted by YACBros85:

Originally posted by tankle104:

Originally posted by YACBros85:

Originally posted by qnnhan7:

49ers Brock Purdy drops an absolute dime on Brandon Aiyuk deep downfield on a great zone-beater route concept pic.twitter.com/riAkFE7lck

— Brad (@Graham_SFN) October 2, 2023

This back-shoulder throw from 49ers Brock Purdy to Brandon Aiyuk against the left sideline is a thing of beauty pic.twitter.com/71hJhvRrkg

— Brad (@Graham_SFN) October 2, 2023

His footwork is so clean & crisp. On the first play above, Brock is dropping back like a left handed passer and transitions back to his right effortlessly before making the throw.

He did that a few times last game. I believe they all ended up being deep passes to Aiyuk. Lol

He never ceases to amaze me. It almost seems unreal. Can someone pinch me to make sure I'm not dreaming.

+ Show all quotes

Lol, is this from the Imagination Land 3-Part episode/arc?

Yeah 🤣🤣🤣

Lol, I love those episodes, just hilarious, love South Park.