Compare 66inch limbs to 68inch limbs

[krela]

My thoughts are that all limbs are measured in a standard way at 28" and that any variation is due to either manufacturing tolerances or variance caused by the riser used.

I suspect most manufacturers cover themselves by saying that it's a 'guide' weight and that weight on fingers may vary according to set up. Which is pretty true really, there's a multitude of risers with a multitude of designs, pocket angles etc around.

[archer_thom]

Originally Posted by krela

My thoughts are that all limbs are measured in a standard way at 28" and that any variation is due to either manufacturing tolerances or variance caused by the riser used.

I suspect most manufacturers cover themselves by saying that it's a 'guide' weight and that weight on fingers may vary according to set up. Which is pretty true really, there's a multitude of risers with a multitude of designs, pocket angles etc around.

I've dragged some other risers and limbs out, and there is a difference - all limbs pull stronger on an Exfeel than Hoyts (which are all identical). The worry is (for those of us not lucky enough to be able to use 68's or be able to try out nice limbs very easily), what use is the number on the back? If a 70/36 is 36 an inch and a half from where I'll draw it to, depending on its smoothness it could be 37 1/2 or 41 lbs on my fingers! Incidentally the Synerzys do register 38 at 28, and 44 at 29. Oh, and 46 at my 29 1/2.

[krela]

A 1" increase in drawlength adds an extra 6# in draw weight and 8# at an 1 1/2" ? That really doesn't sound right, sounds like they're starting to stack as soon as they hit 28" which sucks for a long limb!

[ASW1973]

again depends where you measure to and how good your scales are but at the end of the day a set of limbs that are more than 2lbs out are rare and unacceptable, to the degree that hoyt used to put an annotation on each set of limbs to say if they where 1 lbs heavy or light of marked. As a 68 inch bow can comfortably be shot in and around 29.5 (and i know of a gb team member who shoots 68 inch limbs off 30+ inch draw length) u should not see the weight increase per inch you have indicated and I am incredibly sceptical to assign this as in anyway indicative of Synergy limbs

[BorderBows]

Originally Posted by rod

Sid i may be jumping the gun a bit here, since i only orderd them from you last week, i orderd 66inch #42 hex5 with hyperfoam and vx laminate. currently shooting with 68 inch #44 txg drawing 26.5 inch with 42.5lb on the fingers. of coarse i am expecting a improvement in sight marks for several reasons, when i do get hold of them i will be only too happy to post a comparisant.
cheers rod

Ah, you spoke to my dad, the other Sid! thats why!
When i get tickets though to start the bow i get initial and surname... hence not knowing who is who!

Sorry

[archer_thom]

Originally Posted by ASW1973

again depends where you measure to and how good your scales are but at the end of the day a set of limbs that are more than 2lbs out are rare and unacceptable, to the degree that hoyt used to put an annotation on each set of limbs to say if they where 1 lbs heavy or light of marked. As a 68 inch bow can comfortably be shot in and around 29.5 (and i know of a gb team member who shoots 68 inch limbs off 30+ inch draw length) u should not see the weight increase per inch you have indicated and I am incredibly sceptical to assign this as in anyway indicative of Synergy limbs

Yes, I think they're a slightly faulty pair. I was told to use 68" limbs a few years back, but found they were very stiff and I got a lot of string pinch.

[BorderBows]

Hoyt risers have different limb pocket angles to give +/-5% from the marked weight on the limbs.

other than that
Short limbs are faster, Less mass in the limb so it can recover faster. Though it does not defend its string angles out to longer draw lengths so is prone to stacking earler and subject to .

The longer limb allows a smoother feel to the draw, as the vally in the draw force curve is a fraction longer as the limb tip has further to travel.

the reason for the longer riser is to get this extra performance by shortening the limbs, but if thats not an issue, then the shorter riser will get the limbs working better for you. but should still retain some of that extra smoothness and stability of the longer limbs...

lol, thou i wont mention the idea of odd size limbs, like 67"

[ASW1973]

The advantage with shorter limbs is reputedly they recover to their normal position faster so you get abit more speed. This does however make them less forgiving.

No!They are faster because you bend a different part of the limb. no less forgiving.

The other apparent advantage is they gain they weight more rapidly when you are drawing, so you may get an extra Lb closer to its max draw with the same draw length - I'm not sure about this though.

Again no! The draw weight for a set of limbs on a 2 inch shorter riser will be 2lbs increase across the whole of the draw curve, and they will draw further before stacking occurs compared to a shorter set of limbs on a long riser

[pHz]

i assume the 'less forgiving' idea comes from the notion of shorter limbs providing (slightly) less intertia to counteract any turning forces applied by the archer

seems negligible to my non-physics eyes though - the length difference is small compared to the overall length of the bow and there is little weight out at the limb tips to aid this effect ?

slainte : rob

[BorderBows]

Originally Posted by pHz

i assume the 'less forgiving' idea comes from the notion of shorter limbs providing (slightly) less intertia to counteract any turning forces applied by the archer

seems negligible to my non-physics eyes though - the length difference is small compared to the overall length of the bow and there is little weight out at the limb tips to aid this effect ?

slainte : rob

its so to do with the % difference in effect.
longer working limbs on longer bows have longer strings, all this extra length means a 1/4" delay in release on the bottom finger or top, makes less effect on the stress levels on a less stressed longer limb.

take a extream example, lets take a 80" longbow. and a 50" where the whole bow is the limb. Then the string is 2" shorter then the bow and lets look at half the bow as the other half does the same.
40+39=79"
vs
25+24=49"
That is the amount of moving parts to make the 28" of draw. lets say you pull the bottom limb 1/4" more than the top.
the 1/4 is considerable more of a jump towards stack on a short bow, than the long bow, so the stress levels will make the limbs work more differently in the short bow than the long, making the bow less balanced for the same amout of error...
its getting late for that kind of explanaition, hope it came out ok...




thats stressing the shorter bow