Answering several posts in one...
At 10:59 AM 1/16/2010, André Cantin wrote:
I do have some other questions once the formula
is fixed. Mostly matching the favourite club.
Let's say my favourite club is the 5 iron. In
order for me to match the rest of the clubs do I
have to take the favourite club apart and weigh
the various components and then match the rest
of the sets? Or do I just approximate the specs
provided by the manufacturer? Or something else?
Well, we're matching pendulum period here. So it
is possible to measure the period and total
weight, and then compute an equivalent Le. If
Rocco doesn't post the formula for that, I'm sure
I can come up with it. After that, you just match all the clubs to that Le.
_______________________
At 11:13 AM 1/16/2010, Allen Humphrey wrote:
my question is.....to what degree, if any, is
this more accurate or productive than the SpeedMachine ?
The SpeedMatch matches MOI. This matches pendulum
period. They are different. An MOI matched set
will not be pendulum-matched, and vice versa.
Now that we have that fundamental point out of
the way, let's get to your questions about accuracy and productivity:
ACCURACY: The SpeedMatch matches MOI more
accurately than this spreadsheet matches pendulum
period -- or, for that matter, MOI. But that does
not mean it is not useful. (BTW, the
pre-SpeedMatch digital pendulum MOI tool can be
used to pendulum-match a set very accurately.)
PRODUCTIVITY: MOI matching has a moderately long
and generally positive history. Pendulum matching
does not have nearly the experience. The two
commercial ventures into pendulum matching
(probably around 1980) were not big
profit-makers; I don't know how successful they
were in any scientific measure of matching.
__________________________
At 11:13 AM 1/16/2010, André Cantin wrote:
Also forgot. Do you match all clubs or the irons
to the irons and the woods to the woods?
Since we don't know much yet about pendulum
matching, nobody has a really good answer to
this. Some people may have tried it and have an
opinion, but there is no strong body of
knowledge, either analytical or empirical, to support it.
_______________________________
In answer to André's other question, the meaning
of the Q column, I have a question in to Rocco
about that. I'm pretty sure I know; here's what I think it is.
First, remember that Le (column F) is the length
of an equivalent SIMPLE pendulum. With a point
mass on a string of length Le, the pendulum will
have the same period as the compound pendulum comprising the golf club.
Now, look at column Q. It is labeled Lmoi, and is
immediately after the MOI column. So I'm pretty
sure it is the length of a fictitious golf club
with the entire mass of the club being a point
mass of the same total weight as the original
club. Placing that point mass at Lmoi will give
the same MOI as the original club.
Why is it included in this spreadsheet? I have no clue.
Hope this helps,
DaveT
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