Thunk sound

[PrimitivePete]

I picked up a Black Widow TF a few months back and I'm trying to figure out why I'm getting a thunk sound when I shoot the bow, only time I'm not getting it is when I go way up in size with wood arrows. Bow is 56@28. Happens even when I'm using aluminum shafts, also feel like there is vibration on the limbs as well. Never had a bow feel this way.

[GCook]

I had a bow like that once.  I couldn't figure it out.  I went down in spine, I went up in weight.  I even incorporated the help of the bowyer.  The only thing I didn't think of was the string.  Nock tightness, type of material, etc.

[BigJim]

Most of the time, the thunk is arrow hitting the bow... meaning too stiff. Wood arrows wouldn't make as much noise generally when doing this.
BigJim

[GCook]

Wood arrows are also not hollow so the don't resonate sound like a carbon or aluminum arrow.  Plus my experience is the generally have a looser nock fit on my bowstrings.

[PrimitivePete]

Thank you both, I was a bit high on the spine, switched over to a lower spined wood arrow and no more thunk !!! I love the bow but it has to be the pickiest bow when it comes to finding a right arrow for it.