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Ugly twang on R/D Recurve self bows...

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TimmyDeNorCal:
Badger,

It’s as if I just have too much unaccounted for string contact, and the twang is bothersome, and just annoying.

On a normal static recurve I would have accounted for the string contact, of course...and I guess by its very design I would have kept the outer limb tips wider, and flatter. Then, if need be - which I guess I always feel the need - I’d have filed in string grooves. And, even though the finished bow features a lot of limb contact with the string, there is only that satisfying decently high-pitched tone from a string pluck.

But in the R/D bow, if the reflex in the outer limbs is great enough, the bow is more of a man RD Recurve in design (I think I will design my next few RDs with a more gradual, elongated sweep in the outer limbs thereby rendering it a dern RD ONLY!). But, for now, these RD recurves sound terrible...even with a (shamefully slow!) tiller that ended up with decently low set. 

The reason for my post was to see if other people had run into this issue, and if so, how they dealt with it. I’ve received some good tips so far...but I think my next question would be whether I should design the outer limbs and tips like I would a regular static recurve - meaning wider, flatter-bellied, with string grooves. OR, should I just forego the recurve effect on the tips of any & all RD-limbed bows...?

To make this post even longer, I will just add that I got into this situation because I was hoping the outer limbs would not create string contact down the limb...but then I heated in bends that created them, while not accounting for them when roughing out the limbs.

paulsemp:
I've had a few that have d flex in them where there's not a lot of tension at brace. Raising the brace height can help tremendously. The only thing that makes sense to me is there's not enough tension at brace to stop the string vibration. I posted a few months back a yew deflex static I made. Anything under 6 and 1/2 in brace it was not shootable. Get it up to 7 in and it was like magic

IdahoMatt:
What type of string do material are you using.  Also sometimes if you twist the string too much it will get more stretchy.  I use d97 and try not to get too much twist into them.  Just enough to get them together.

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