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Topic: Fulcrum< Next Oldest | Next Newest >
 Post Number: 221
springer Search for posts by this member.

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PostIcon Posted on: Dec. 09 2011,07:42  Skip to the next post in this topic. Ignore posts   QUOTE


(springer @ Dec. 08 2011,21:55)
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(Alejandro @ Dec. 08 2011,21:21)
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In the Gordy’s video you can see the IC in each instant of your cast, so I don't understand how you can still believe in the fantasy of the fulcrum in the upper hand.

By definition a fulcrum is a physical point of contact on a lever. Gordys magic yellow dot doest touch anything so how can it be a fulcrum? Surely this cannot be such a hard principle for people to accept?

The IC/rotational center and the actual fulcrum cannot possibly be one and the same.

How many fulcrums do you know that dont actually have a physical point of contact to the lever?

ps At what point in my clip does my top hand go behind my head, as far back as my ear as your red line suggests?

As for what I wrote earlier - any offers?

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 Post Number: 222
Lasse Karlsson Search for posts by this member.

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PostIcon Posted on: Dec. 09 2011,07:44 Skip to the previous post in this topic. Skip to the next post in this topic. Ignore posts   QUOTE


(springer @ Dec. 09 2011,00:27)
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(Lasse Karlsson @ Dec. 08 2011,23:02)
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(springer @ Dec. 08 2011,21:47)
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(Lasse Karlsson @ Dec. 08 2011,21:02)
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Hi Alan

I'm sorry, but I'm really missing what is wrong in that straight line measurement of your hands, both lines have the same starting and stopping point?

How should it be done accuratly?

Cheers
Lasse

Take a look at the red point that marks my thumb, the start of the top hand movement on part one of the gif. The gif is made of 2 pictures. It moves to somewhere on my face near my eye for the second part thus increasing the measurement.

On my computer screen my top hand moves 30mm, my bottom moves 45mm which is 50% more.

Hi Alan

The dot doesn't move a pixel, you on the other hand leans forward, that's why it seems to change position.

Cheers
Lasse

No Lasse you are wrong.

I appear to move significantly due to the way Aitor has overlaid the 2 images to make the gif file, take a look at the original video.

http://vimeo.com/32786264

At 21 seconds I start the forward stroke. Mark the start and stop positions of both hands on your screen, you will see what I mean.

Cool, i'm quite ok with being wrong  :)

So it's the bloody trees in the background that moves, that makes so much more sense....

Cheers
Lasse


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 Post Number: 223
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PostIcon Posted on: Dec. 09 2011,07:57 Skip to the previous post in this topic. Skip to the next post in this topic. Ignore posts   QUOTE

Any offers on the more relevant stuff Lasse?

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PostIcon Posted on: Dec. 09 2011,10:08 Skip to the previous post in this topic. Skip to the next post in this topic. Ignore posts   QUOTE


(springer @ Dec. 08 2011,23:55)
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By definition a fulcrum is a physical point of contact on a lever. Gordys magic yellow dot doest touch anything so how can it be a fulcrum? Surely this cannot be such a hard principle for people to accept?

With that definition both the bottom and top hand are always fulcrums.

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 Post Number: 225
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PostIcon Posted on: Dec. 09 2011,10:48 Skip to the previous post in this topic. Skip to the next post in this topic. Ignore posts   QUOTE


(sms @ Dec. 09 2011,10:08)
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(springer @ Dec. 08 2011,23:55)
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By definition a fulcrum is a physical point of contact on a lever. Gordys magic yellow dot doest touch anything so how can it be a fulcrum? Surely this cannot be such a hard principle for people to accept?

With that definition both the bottom and top hand are always fulcrums.

That would be a fair point if you didnt have to take into account where the driving force is coming from.

Push with top hand against a passive bottom hand = bottom hand fulcrum.

Pull with bottom hand against a passive top hand = top hand fulcrum.


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 Post Number: 226
grunde Search for posts by this member.
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PostIcon Posted on: Dec. 09 2011,11:23 Skip to the previous post in this topic. Skip to the next post in this topic. Ignore posts   QUOTE

The forces from the two hands will be almost equal but in opposite directions...

Cheers,
Grunde


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 Post Number: 227
Paul Arden Search for posts by this member.
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PostIcon Posted on: Dec. 09 2011,11:32 Skip to the previous post in this topic. Skip to the next post in this topic. Ignore posts   QUOTE

I am surprised at this too. I had always imagined the fulcrum to be either hand or a point inbetween, and that during the cast this point often moved somewhere along the handle but never left it.

So it's not the hands on the rod that provide the fulcrum, but the body itself?

Thanks,
Paul


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 Post Number: 228
Marc LaMouche Search for posts by this member.
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PostIcon Posted on: Dec. 09 2011,11:46 Skip to the previous post in this topic. Skip to the next post in this topic. Ignore posts   QUOTE

yup ! that's been demonstrated several times on the analysis videos and even without them it just makes common sense.
anyhow, what this means is there is no such thing as top or bottom hand fulcrum casting :)
the term is incorrect.

cheers,
marc


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 Post Number: 229
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PostIcon Posted on: Dec. 09 2011,11:51 Skip to the previous post in this topic. Skip to the next post in this topic. Ignore posts   QUOTE

Thank goodness we didn't define Casting Stroke Length as the linear change in fulcrum point then :p

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PostIcon Posted on: Dec. 09 2011,12:08 Skip to the previous post in this topic.  Ignore posts   QUOTE

yes. that would have been wrong !  :D

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