LYNN:

http://asafgolf.free.fr/images/golf/...profil1234.jpg
http://asafgolf.free.fr/images/golf/...er_dos1234.jpg
http://asafgolf.free.fr/images/golf/...r_face1234.jpg
http://asafgolf.free.fr/images/golf/...dessus1234.jpg

BTW Lynn,

Could you elaborate on this? (the bold part):

"At this point in the Stroke, El Tigre appears to be leaning backwards -- his right ear is outside his right foot -- in an attempt to hit 'up' through Impact. This could well be the case if his intention was to minimize the Compression Leakage of Backspin (and its quid pro quo...control)."

comdpa swing
 

Coming soon to blakebuster for all your rental needs.

Per 7-1, the prestressed (bent) Clubshaft which helps resist Impact Deceleration must be established before -- not during -- Impact.

Yes, everything else being equal, the more stress you place on the shaft, the more Effective Mass, hence more Power. However, I do not think the visual bend you see in the shaft is necessarily beneficial. Someone with more equipment knowledge could elaborate maybe.

An Explanation
 

The bend in the shaft will occur in a direction opposite to the applied force. The direction of the applied force should remain constant throughout the stroke, however the clubface orientation changes as it gets squared through impact. At that point, the bend (direction of bend relative to an unstressed shaft) in the clubshaft would now be perpedicular to the clubface (approximately) even though it started out somewhat parallel at the top.

Hi Birdie
I see that you ave a taste for good sites;)
French golf sites are not a lot and ASA is a funny site for planes and golf fans
Have a look to "photomontages". Some funny pictures

Amitiés...
Pm

Hush now...
 

Shh....!!!

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:

http://www.truetemper.com/shaftlab/profile.html

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.

Good reply BerntR. So most the prestress is lost at Impact :(

Would you say Homer was wrong about the idea of a prestressed Clubshaft and how it helps the golfer, or we just don't completely understand what he's trying to say?

Photo evidence
 

I think someone said earlier that the clubhead never lags behind during impact.

Not lost, transformed from potential energy to kinetic energy -clubhead speed :-)

I think I will leave to other to comment on the Homer part of your question.