Re: Test. 3 questions.
- From: "Martin Levac" <vac3@xxxxxxxxxxxxxxxxxx>
- Date: Wed, 30 Nov 2005 14:08:11 -0500
"Alan Murphy" <afmccl@xxxxxxxxxxxxxx> a écrit dans le message de
news:dmk09j$spb$1@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> "Martin Levac" <vac3@xxxxxxxxxxxxxxxxxx> wrote in message
> news:Tpbjf.8232$a95.1401239@xxxxxxxxxxxxxxxxxxxxxxx
<...>
> Martin,
>
> How does that square with the following from excerpt
> from Search for the Perfect Swing by Cochran+Stobbs.
>
> "Power.
> During his downswing a good golfer can generate
> up to four horsepower.This is a surprisingly high
> power; and must need at least 30 pounds of muscles,
> working flat-out to produce it. This figure excludes
> those muscles which merely stabilize his joints in action;
> and it leaves no doubt that the big muscles of the legs
> and trunk must play a greater part in the top-class
> player's striking of the ball than those of his arms and
> hands"
>
> They argue elsewhere that one pound of muscle is
> capable of producing 1/8hp.
>
> Alan
I argue that speed, not horsepower, is the key to power in the golf swing. I
argue that based on the weight of the clubhead and the weight of the ball.
The ball doesn't need 30 HP to be sent flying at high speeds, it weighs 45g.
Neither does the clubhead, it weighs 200g.
Let's put that in perspective.
The best baseball pitchers can throw a ball at around 95 mph. The ball
weighs 140g or just about. There's no collision between any part of his body
and the ball so there can't be any spring like effect involved between his
body and the ball. He must propel the ball unaided by a club or any other
extension so his hand must also travel at speeds of at least 95 mph for the
ball to be propelled at 95 mph as well. The motion is very different from a
golf swing but nevermind that for now.
The best golfers can propel the clubhead at speeds upwards of 120 mph and
the ball at speeds upwards of 180 mph. The clubhead weighs about 200g while
the whole club weighs about 350g. We could take advantage of the leverage
offered by the length of the club but there's not enough strength in the
hands for that so we use the hands to control the club only. Instead, we
take advantage of the centripetal force afforded us by the movement of the
hands in an arc around an axis pulling the club in an arc as well.
We take advantage of centripetal force by starting this arc with the club
and arms at a 90* angle and maintaining this position until we release the
club at the proper time for centripetal force to produce as much speed as is
possible. The hands are moved in a constant arc while the club is moved in
an increasing arc through the release action. Centripetal force effectively
acts as the lever to propel the club at high speeds as it is released from
its starting position. Because of this lever action caused by centripetal
force, not much strength is needed to apply the required force to produce
centripetal force in the first place. We must not dismiss the effect of
gravity on the acceleration of the hands and clubhead as they are pulled
through this arc.
Here's the key. The faster the hands move through this arc, the greater the
centripetal force is produced, the quicker the release action, the faster
the clubhead moves through this arc as a result. Speed is king.
The baseball pitcher throws at 95 mph. The golfer propels the clubhead at
120 mph. Why such a small difference in speed? How can 30 HP only produce
120 mph on an object that weighs only 200g? I remember in a moped mag one
guy had modded his to reach speeds upwards of 120 mph with only 17 HP and he
weighed a whole lot more than 200g.
Becoming stronger in the legs, waist, torso, allows this platform to perform
its task with greater stability subsequently allowing the hands and arms to
swing around a more stable axis. The greater the stability of this platform,
the faster the hands can be moved around an axis, the greater the
centripetal force can be produced. It is not by accident that golfers with
very strong legs produce great power. The legs do not propel the clubhead,
they are the foundation of the platform.
ML
.
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