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Weight drop on bows due to moisture?

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Aksel:
Bradsmith2010: Itīs yew. and, yes itīs supposed to be resistant to at least string follow with high water content. And it hasnīt taken any set because of me drawing it a few times. I did use the same scales to measure it and I am absolutely sure it has dropped massively in weight.

Jawge: I just found a formula by Tim Baker. "wood stiffens 5-6% for every 1% it dries.

With my basic math skills: (I think the bow was about 43# when I made it late last spring) #43 at (a hypothetical) 9% moisture.


Say it dries down to 7% in summer.  #43X1,06=45,6 x1,06 =#48,3 (which is the draw weight the bow had in the peak of summer.

Now lets assume it gains 5% moisture in winter, so it ends up 3% higher in moisture than what it originally had when I made it at #43.

With the same formula I land on #35,7 calculating backwards 3% which also seems reasonable for the atlantic climate here in the Netherlands. 80 RH now

makes sense when I imagine it this way :)

But does this formula make sense? Think itīs from TBB4

George Tsoukalas:
Makes sense, Aksel. I wonder where Tim got it from. I bet he got it from his vast experience. Tim knows his bow stuff. Jawge

bradsmith2010:
you right Jawge (-S

Jjpso:
You need to get a dehumidifier! That’s how I solved the problem. Placed my bows in a room that is not used and placed a dehumidifier there. I have a hygrometer and the moisture is always fine

superdav95:

--- Quote from: Jjpso on December 31, 2022, 02:30:50 pm ---You need to get a dehumidifier! That’s how I solved the problem. Placed my bows in a room that is not used and placed a dehumidifier there. I have a hygrometer and the moisture is always fine

--- End quote ---

This makes sense actually.  Just store them in a separate room.  Good thinking.  I’m gonna try this.  When done shooting them back in the room with dehumidifier

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