People say Sergio has lots of Lag. That's Accumulator #2 Lag they are usually referring to. The angle between left arm and clubshaft is what they see.
But TGMers know that Clubhead Lag is the resistance of the Sweetspot to change direction, which is established during Start Down. It is very slight, very ellusive and hard to see.
But it's not hard to see in this case!
Now THAT'S Clubhead Lag!
You may say he's using some women's whippy shaft. Uhh....no. It's XXX
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tongzilla
Last edited by tongzilla : 01-12-2006 at 06:09 PM.
People say Sergio has lots of Lag. That's Accumulator #2 Lag they are usually referring to. The angle between left arm and clubshaft is what they see.
But TGMers know that Clubhead Lag is the resistance of the Sweetspot to change direction, which is established during Start Down. It is very slight, very ellusive and hard to see.
But it's not hard to see in this case!
Now THAT'S Clubhead Lag!
You may say he's using some women's whippy shaft. Uhh....no. It's XXX
Nice pic there Tong...Bobby was the one that got me started in TGM - despite those cheesy ads from OHP.
Per 6-C-2-A "The Clubshaft is stressed by the weight of the Clubhead resisting a change in its direction or velocity - which is Acceleration....Change of direction bends it during Longitudinal Acceleration (10-19-C)..."
Per 6-C-2-C "The prestressed Clubshaft will resist the added weight of the ball during Impact..."
1/16 inch of bend adds 1 ounce of mass.
Per 2-M-1 "Power is the total effective force impinged on the ball."
Per 2-C-0 "The Ball leaves the Clubface with force proportional to the compression produced by Impact."
Power is 1/2 x Mass x Velocity squared.
When you load the shaft, mass is added.
When mass is increased, power is increased.
When power is increased, the "total effective force impinged on the ball" increases, the FURTHER the ball flies if all things remain the same.
That dam tape is the same reason i got hooked on TGM also. Some times its a curse but I know its the truth though after hearing Bobby's impact. One day I will have that sound
I can verify that Schaeffer's shafts are xxx in that picture. Bobby can also hit lots of different shots including soft pitches, punches and partial speed shots.
He really should have made the tour. Gregg was just as good as a young man and even now. Lucky for us students that they became teachers.
We'll be in Australia for our golf schools starting this weekend.
So what use is clubshaft lag like this (by the way I think the magnitude of the bend "observed" here is a aperture speed issue) if the shaft is bent toe up? Does anyone think this is useful in transfering power to the ball? If so how?
So what use is clubshaft lag like this (by the way I think the magnitude of the bend "observed" here is a aperture speed issue) if the shaft is bent toe up? Does anyone think this is useful in transfering power to the ball? If so how?
Golfie
Per 2-E "Notice this - the ball acquires only 70% of the Clubhead "approach" speed (so there must be speed) but 100% of the Clubhead "separation" speed (so there must be resistance to deceleration)...Prestress (Acceleration) stiffen the Clubshaft for consistent (minimum to maximum) resistance to Impact Deceleration."
By loading the shaft, you "prestress" it, making it less susceptible to deceleration during impact.
Why is that needful?
Because ball speed is dependent on two factors; Clubhead approach speed and Clubhead separation speed.
The more loaded the shaft, the more it resists deceleration because of a greater Moment of Inertia, hence increasing the second contributing factor to ball speed - separation speed.
With high approach speed and high separation speed, we will get high ball speed ceteris paribus which translates into "big" shots!
Please take a harder look at the diection of the supposed bend in this shaft and tell me if you think this will increase clubspeed. The shaft is bent so that it is toe up, is it not?
Per 2-E "Notice this - the ball acquires only 70% of the Clubhead "approach" speed (so there must be speed) but 100% of the Clubhead "separation" speed (so there must be resistance to deceleration)...Prestress (Acceleration) stiffen the Clubshaft for consistent (minimum to maximum) resistance to Impact Deceleration."
Although Sergio's prestressed shaft looks (and is) impressive and probably helps increase ball speed, it doesn't happen tha way it's indicated in a few of the posts here. The prestress that we see on these pictures is more or less completely unloaded a long time before impact. And it's probably reloaded and unloaded a second time before impact. Shaft loading profile depends on swing technique. See this link. The first graph that appears has to loading bursts and is the most typical loading and unloading pattern:
Please also note that the shaft is completely unloaded at impact. Only centrifugal acceleration and mass velocity is at work, and the toe of the club is pointing down. Don't underestimate the power of centrifugal force regarding impact deceleration resistance!
The prestressing of course happens because active torq is applied. The torque causes a clubshaft bend that has a similar effect as an increased wrist cock. That in itself will contribute to increased swing speed.
Back to the pictures of Sergio: With the same swing and even stiffer shaft, the torque in the wrist cock would increase because the shaft wouldn't bend as much. That torque increase would in fact lead to reduced swing speed - as in clubhead throw away. As a general rule, big wrist cock (with a help of shaft bend) early in the swing will produce increased swing speed. Torque might increase swing speed if it is applied very late in the swing (as for hitters?)but that has no relation to what we are seing in this pictures.
Hybrid Mode
