Extenders

[geoffretired]

So. it would seem that finding the COG is fairly straight forward but there is little agreement about where it should be if you want to move it around.
Are there some objectives to aim for? I was told years ago we use stabilisers to tighten groups. I can follow that line but it's not totally helpful.
I'm thinking in simple terms like:
should it be bottom heavy rather than top heavy?
should it be front heavy or back heavy?
when the bow is in its power stroke, should there be little or no tendency to rotate in any direction or is it better if rotation tends to be long rod turns down or whatever?
What do I tell others when they ask me? Saying, "opinions differ,"seems rather unsatisfactory.

[Shirt]

6" ACE. I've got a pair of them, and they're magic.

[LineCutter]

I don't use an extender. The COG of my bow is opposite the point of pressure on the grip & just forward of the riser. I've got video of the bow being shot that shows that this lets it move straight forward, well... until gravity & the bow sling get it.

Can someone give me an idiots guide to why I'd want to use an extender to achieve the same effect on COG as I have at the moment? What is the magic about having the V-bar further away from the riser?

(really simple will do, but ideally something marginally above "'cos I say so" or "'cos it works better")

(Linecutter is feeling baffled)

[Shirt]

Moment of inertia is further forward = feels harder to move bow off target.

[joetapley]

I'm thinking in simple terms like:
should it be bottom heavy rather than top heavy? ------Bottom
should it be front heavy or back heavy?----------------Front Heavy
when the bow is in its power stroke, should there be little or no tendency to rotate in any direction or is it better if rotation tends to be long rod turns down or whatever?---- No bow movement*

*As the power stroke only takes around 0.016 seconds impossible to detect of course so only "after the arrow has gone" movement visible.
Criteria for "follow through" are that the bow should jump straight forward and then rotate long rod down. If long rod observed to kick up immediateley after the shot then bow COG is not far enough forward.

[geoffretired]

Thanks again,Joe.

[TJ Mason]

I use a 4" extender when I use v-bar and twins, which isn't all that often. Does anyone know where I can get a 6"-8" extender, please? None of the suppliers I've checked have anything over 5".

[joetapley]

Can someone give me an idiots guide to why I'd want to use an extender to achieve the same effect on COG as I have at the moment? What is the magic about having the V-bar further away from the riser?

(really simple will do, but ideally something marginally above "'cos I say so" or "'cos it works better")

Linecutter
This is the $64,000 question which can by applied to anything archery equipment related. Your second point may be the only one available.

100% of top class recurve target archers use carbon arrows outdoors. None use wood or aluminium. It seems a reasonable conclusion (?) that carbon arrows perform better than wood or aluminium.

100% (?) of top class recurve target archers use extenders and 99.x% use a V bar asembly. Same logic as above seems reasonable (?). Maybe not satisfactory but often that's all there is by way of a justification.

etc. etc. What difference does adding carbon to glass fibre limbs make? worth spending the money?

[Tarkwin]

Originally Posted by TJ Mason

I use a 4" extender when I use v-bar and twins, which isn't all that often. Does anyone know where I can get a 6"-8" extender, please? None of the suppliers I've checked have anything over 5".

Alt. Sports list a Cartel 6" but don't have one in stock.

Perris Archery (http://www.perrisarchery.co.uk/PAstabilisers.pdf) list an Easton 6"...but the easton site doesn't(http://www.eastonarchery.com/accesso...ow=stabilizers)

Beiter sell the carbon rods - and all other fittings individually (up to 45" long) so you could make one as long or short as you need.

Alternatively you could use two shorter units to make up the size you require ( 2 x3" or 1x3" and 1 x4"). - not ideal but would work.

T.

[JohnK]

Originally Posted by joetapley

100% (?) of top class recurve target archers use extenders and 99.x% use a V bar asembly.

The question mark implies you're wondering about exceptions Butch Johnson (1350 shooter) doesn't use a v-bar, and nor does John Magera. Vic Wunderle won silver in Sydney with a different set up too.

However, these chaps are exceptions rather than the rule. As long as you can handle the mass weight, sticking with a v-bar + extender assembly is a good option.