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bow measuring procedures for WTT4

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bow measuring procedures for WTT4

Postby jwillis » Wed Mar 03, 2010 9:52 am

This can be confusing, so I am posting this explanation and illustration to show the way we will set up the bow pulling rack and shooting machine at WTT4.

Our published procedures...
EVENT TESTING PROCEDURES FOR 2010:
(same as 2009 unless we vote to make changes)
...3. Strings will be provided for all the bows in the regular classes. If you are entering a bow for the open class, you must provide a string of at least six strands that will brace the bow to a minimum of 6". The bowyer must also specify what brace to use if more than 6" is recommended for that bow. The other classes require a minimum of 6-3/4" brace height on all bows...


All classes of bows will be pulled to 28" AMO, which is 26-1/4" from the deepest point of the grip.

On the bow weighing rack, there will be a stop collar on the pulling cable to keep bows from pulling farther than 26-1/4" from the deepest point of the grip. (This corresponds to 28" AMO which is measured from the virual back of the bow which is 1-3/4" from the deepest point of the grip.)

On the shooting machine, the mechanical release will be set to release the string at a fixed distance of 26-1/4" from the deepest point of the grip. (This corresponds to 28" AMO which is measured from the virual back of the bow which is 1-3/4" from the deepest point of the grip.)

On the bow weighing rack, on bows in the "Open" class (with a 6" brace height), the string will appear at brace at 7-3/4" on the ruler on the bow pulling rack.
For all other classes (with a 6-3/4" brace height), the string will appear at brace at 8-1/2" on the ruler on the bow pulling rack.
All classes of bows will pull to 26-1/4" from brace height, which will appear at 28" on the ruler on the bow pulling rack.


The illustration below should illustrate this.

Image
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Re: bow measuring procedures for WTT4

Postby Hornseeker » Tue Mar 16, 2010 11:41 am

Of course it is...otherwise this event wouldn't be repeatable! I think Jim is just making sure the new guys understand it!
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Re: bow measuring procedures for WTT4

Postby jwillis » Wed Mar 17, 2010 7:57 am

Yes...just posting a clear explanation. I hope to post more explanations, just to clear up any questions about the parameters or consistency of our test procedures. There have been several detailed suggestions posted about how to do the testing and "have you thought of" questions...lol. :roll: ...mostly by people who are new to the site and/or seem to have no plans to send a bow to be tested. The test procedures have all been posted months before the event and have not changed for three years straight. There has been ample time allowed for bowyers to build for the event and make adjustments if necessary. However, the procedures and bow set up are pretty much standard for the hunting style bows which most people make. So...everyone knows what to expect...and should have plenty of time to maximize their bow to perform well under these test procedures. It is easy to sit around on a stump and criticize what others are doing, but much harder to make a fast bow. This is why the event is well named as "Walk the Talk." Fast bows talk, and bullshit walks. Jim
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