[QUOTE=st_francis;8029654]
Not exactly…it does change the balance but you can’t weight anything to go behind the vertical , gravity says a weight will only balance on the perpendicular . The bosals are plaited rawhide over a rawhide core and are quite stiff, not limp. You custom shape each bosal for the horse , I used to wet mine and tie them around a coffee can with twine. They pretty much hold their shape after that if you loop the mecate around them when they are hanging. [/QUOTE]
Are you intentionally shaping them so they hang with the heel knot hang like this? http://www.evaha.org/wp-content/uploads/2011/09/Khai-Reg-7-20070430.jpg
I’ve never seen a bosal with much of a stiff core take a set like this. At best they’re very soft rawhide cores, but often they’re rope cored. People who don’t bother to untie their mecates each time can end up with a slight forward set, but Arabian WP seems the only place where bosals end up looking like the above photo.
Most times when I’ve seen people speak of shaping they’re shaping the nose button to conform to the muzzle without gaps at the side.
What aspect of the shaping process (wider/narrower or bent forward) are you referring to here.
A bosal also cannot exert leverage (there’s no fulcum such that a curb strap provides), so it’s not quite correct to use that term.
The problem with using the rein out to the side is that you end up asking the horse to tip his nose out from under his his spine. To the extreme, you end up with this:
http://www.equisearch.com/content/content/13216/Bosal-Photo1-195x300.jpg
When the horse isn’t aligned in his spine, it affects him all the way back to his loin.
The problem is made worse when the mecate is tied on like in this pic (or likely the one above, can’t quite tell):
http://farm6.static.flickr.com/5089/5212898449_d8fa29376c_m.jpg
…such that the reins come out of the bottom of the stack of wraps down by the heel knot, rather than up close to the chin. People that tie that way are trying to use the bosal as a lever, as you state above.
With no curb strap, however, all that happens in longitudinal actions is to increase the amount of rein required to have the bosal contact the jaw (ie, move your hand more). Whether the rein is high or low on the wrap stack the only force the horse feels is the same exerted by the rein…there’s no multiplication of force in either case, so no leverage.
The bosal action is quicker with the reins coming out by the chin however, which most people think of as a good thing if you eventually want to ride with your hands in a small “box” above the saddle horn.
For lateral action, it will amplify the twisting force put on the bosal if the rein tie is down low (moreso if the bosal is too long and lots of wraps are stacked). A sensitive horse will be more strongly encouraged to follow that twist to say in the center of the bosal, with the corresponding affect on his spine.
Though it’s good to hear you emphasize that bosals should be used mainly with a lifting action (which I agree with…they’re more longitudinal tools than lateral ones), with the rein on low you’re also more likely to get inadvertent lateral requests. That may be why the wide hands evolved…an attempt to keep the horse’s poll level with a really unbalanced bosal.
The added weight of the rein down low will also cause the bosal to want to hunt or drift more. WP horses don’t really move enough for this to be an issue, but it would be a bad habit to take into another event.
That’s not a “vaquero” comment simply because I made it,BTW, it’s just physics.