Archery Talk Forum banner

1 - 5 of 5 Posts

·
Registered
Joined
·
470 Posts
Discussion Starter #1
I have a 21inch Dalaa DAS riser I have shot this riser for a few years. Last weekend I went to 3 rivers and my original limbs were maple core and medium the new limbs are foam core and long. The current bow is at 66 inches. The difference between the old limbs and new limbs is very obvious to me in terms of the smooth draw. The problem I have is regarding the vibration and noise of the bow. When I got the new limbs home I took the bow out back and shot it. It was so loud I took the string off and inspected the limbs for cracks. After proving to myself there were no cracks I thought okay one step at a time. I started playing with Brace Height on the 66 it likes the 8.5 which is a little higher than the 64 inch limbs preferred. This took some of the vibration and noise out. A glimmer of hope!
Next was tiller- On my 64 limbs I think I was positive tiller .25 inches. Just to clarify in case I’m hosing this up the bottom limb measured .25 shorter than the top limb. When we set the new 66 limbs up at 3 rivers it was set up for neutral tiller. I am told by many that three under shooters which I am, generally shoot tiller neutral. So I measure tiller and realize the bow is actually a 16th positive.

Below are the steps I have taken.
• Take limbs to max on the Dalaa to ensure both limbs are at the same tiller and even weight-B-7 2/8 T= 7 2/8 I actually find that the top limb is positive when maxed by a 16th. I correct and now have even tiller.
• Shoot Dalaa – Loud as heck –tons of vibration – lots of high nock on bare shaft
• Adjust to Positive tiller 1/8 Slight improvement in hand shock and noise and believe it or not high nock
• Adjust again Positive Tiller 1/8 Major Improvement in hand shock and noise. Final tiller B 7 1/8 T 73/8 Brace Height 8.5.

Something to point out since I maxed both limbs to ensure even tiller “I measured to verify” I could not turn both limb screws in opposite directions. The top limb was maxed so to adjust tiller only the bottom limb was adjusted. I did not go past 1/4th positive because the Dalaa Manual recommends 0 to ¼.

The problem: I am now hearing noise and feeling vibration specifically from the top limb not the bottom.

Other possible variables: I am also used to a perfectly tuned bow with a 6 strand Silent But Deadly String. My SBD for the new limbs is on order until then I have string from 3 rivers. So I am sure that some of the additional noise is coming from the fact that foam core are a bit noisier than maple and I don’t have a SBD string I also do not have limb savers on these limbs and I do the others. There is more limb on the new set up so maybe more vibration is expected.

Questions:
Why would positive tiller work better for me when Im a 3 under shooter?

Did I hose something up by not turning both bolts in opposite directions?

Can I go beyond ¼ positive tiller?

Misc Facts-
My old limbs were set at 43lb 64 inch bow- New limbs set at 42lbs 66inch bow
I shoot off of a flipper rest not off the shelf, I tie my own nock bottom and top.
Thanks in advance for any suggestions or answers.
I often struggle with to much string weight on my ring finger which throws nock high.
 

·
Registered
Joined
·
20,330 Posts
Green -

Assuming the limbs are not defective (very rare, but possible):

Raise the brace height (even with a 21" riser, some long limbs like a 9" brace) and do formal tuning.

Tiller is relative. Pick a number you like between 0 and +1/4" positive and then tune with the nocking point position.
Where it "supposed to be and where you need it may be two different things.

Could the string be at fault? Sure, but can't say from here. I'd try a generic 14 strand D97, giving a taller brace height and see what happens.

Most important - don't over think this stuff.

BTW - make sure there's nothing loose on the bow. Wouldn't be the first time a loose bolt was the culprit.

Viper1 out.
 

·
Registered
Joined
·
470 Posts
Discussion Starter #3
I guess that has me confused. If tiller is relative why is is reducing vibration as I adjust it and hold BH constant?
 

·
Registered
Joined
·
20,330 Posts
Green -

Did you move the nocking point when you changed the tiller?
Each affects the other.
IOWs, you can and do change tiller, when you move the nocking point.

That's why I said, set the tiller within spec, then tune with the nocking point.

The reason the 0 - 1/4" spec is given, is (usually) because beyond that, you can't move the nocking point enough to compensate.
If you want vibration, try a negative tiller...

If you want to complicate matters, things like bow hand position and in your case, the heavy ring finger are also factors.
Instead of trying to calculate all the variables, set the bow up close to spec and start bare shaft tuning.
If the arrows are any where near close, they will tell you what you need to do.

BTW - the other factor are the arrows themselves, while those limbs can handle arrows as light as 6 gr/lb, they or rather you may not be happy with arrows that light.

Lastly, not knowing the specific limbs, there can be between a 0 to 10 fps difference in speed with a given arrow.
Therefore, your old arrows may or may not be appropriate for the new limbs.
That's why the necessity for formal tuning.

Viper1 out.
 

·
Life is Go0d.
Joined
·
1,385 Posts
I also shoot a 21" DAS and medium limbs. I shoot 3 under as well and use zero tiller. My limbs are first gen Soza era and are carbon. I have had no issue with noise, which doesn't solve your problem. What kind of string are you using? I'm not sure if setting max pre load equals zero tiller. I use a bow square on the face of the limbs where the limb pads meet.

The extra length of the limbs equals more material to vibrate, which equals noise. The das bows can handle down to 6 gpp which I've proven. Try the above suggestions with brace height, and a heavier arrow will quiet it as well. Are the thumbscrews at the limb connection snug? Is the rubber on the thumbscrews dry rotted? How about the limb pad rubber? Also the screws for the pre load adjustment need snugged as well. String material, arrow weight, brace height, tiller, string silencers must be placed in their most effective position, (which can affect tune) nock position is related to nock high when bareshafting.

Also the extra performance equals more energy which translates into noise. There is always a compromise. Are the grip screws snug? How about the center shot adjustment screws..both snug? I currently use a d97 14 strand and while its not whisper quiet, its not loud either.
 
1 - 5 of 5 Posts
Top