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Thrumming Bow???

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paulc:
So after years of hanging on these boards I might finally have a bow I made and 3 or 4 arrows I made that I'm comfortable shooting at a living target. Only today the bow was "thrumming" with each shot. Definitely the bow, not the arrows. I've never noticed it before but I've also never succeeded in making an arrow to shoot thru the bow. I've shot lots of crappy fiberglass shaft arrows thru this bow in the past w no sounds from the bow. I don't have any silencers on the string as it was never needed before.

Hickory bow, about 45lbs or so. Crepe myrtle shafts, river cane shafts w trade point or obsidian. Turkey feathers fletch. I did put a piece of bamboo onto a fiberglass shaft so I could mount a trade point on it...Frankenstein for sure but my best arrow :-)

Any thoughts on the noise coming from the bow?

Thanks, Paul

Hamish:
If the "thrumming" hasn't happened with the bow in the past I would carefully look it(and the string) over for damage. Do it whilst strung and unstrung. Look for cracks at the nocks.

It may not be the issue, but best to check.

 I would also check the brace height, and arrow weight. Your arrows could be too light, the excess energy staying in the limbs, showing up as noise

 I was shooting a long self bow at an archery club. They used these steel rebar, ground quivers. Basically the bar stuck in the ground with a loop at the top to hold your arrows together at the shooting line. Lots of people shooting at the same time, people were crowded in side by side, not much room to move. All the modern bows, glass or compound were shorter and cleared quivers but my bow tips slapped it when I loosed the arrow. Only happened twice, before I started to notice the bow shooting differently.

I thought I might have damaged the limbs, but they were fine, no dent's bruises or even a scrape in the finish. The spliced handle was out of line though. The shock had travelled up the limb, into the splice, and the billets were tearing apart along the glue line. Caught it early enough and no permanent damage done, able to be repaired.

bownarra:
Eiter arrows too light - unlikely if you are using glass arrows.
Bows limbs are out of balance, one relative to the other
Or tiller is out of whack.

ShorterJ:
Is the bow making this “thrumming” noise with the same arrows that were quiet before?  I have more noise with my homemade arrows. 

When you say it’s “definitely the bow not the arrows” do you mean it’s definitely the bow making the sound (could still be arrow/string issues), or that it’s definitely the bow itself that’s causing the noise problems (the bows fault only not arrow/string)?  If it’s the latter then all I can think of is some sort of unknown alteration/damage to the bow itself.  Otherwise all I can think of is arrow/string tuning issues. 

Hopefully you can locate the issue.  One of mine has quite the “thrumming” sound that I would like to get rid of as well.

Eric Krewson:
Raise your brace height, that should take care of it, your string may have stretched.

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