Primitive Archer

Main Discussion Area => Bows => Topic started by: txdm on February 02, 2019, 02:05:34 pm

Title: How much crowning for a hickory board?
Post by: txdm on February 02, 2019, 02:05:34 pm

I am planning my next hickory board bow and I'd like to try crowning the back to reduce set that results from overpowering the belly.

Based on the below reference, what would be a good amount of rounding/crowning to try for?

(http://www.dmcknight.net/forumpics/bowyer/back-crowning_1.png)

My last hickory board bow was like #1, and it took a couple of inches of set (with toasting)

Title: Re: How much crowning for a hickory board?
Post by: PatM on February 02, 2019, 02:09:42 pm

None of those.  You want the back narrower than the belly.

Title: Re: How much crowning for a hickory board?
Post by: willie on February 02, 2019, 05:57:59 pm

ie trapezoid

Title: Re: How much crowning for a hickory board?
Post by: txdm on February 03, 2019, 07:38:49 am

Wow, thanks yall... so something more like one of these would be better?

(http://www.dmcknight.net/forumpics/bowyer/trapezoids.png)

Title: Re: How much crowning for a hickory board?
Post by: StickMark on February 03, 2019, 08:21:52 am

# 7 is what I use, always.

Title: Re: How much crowning for a hickory board?
Post by: willie on February 04, 2019, 05:10:00 pm

txdm,

just remember that you will be asking more of the back the more you trap. hickory can be a excellent performer when dry, but the back strength drops off if it is too dry, while the belly keeps getting stronger

Title: Re: How much crowning for a hickory board?
Post by: txdm on February 04, 2019, 05:35:38 pm

Thanks, I'm very glad I asked about this.

I am planning a 62" ntn that is 2" at the fades, down to 1-3/4" midway, then down to 1/2 at the tips. That's a bit wider than I've done before.

If I were to go with #7 style, I would try keep the back around or a little more than half of the width of the belly. Not sure if I should have the angled sides only slope partway down or all the way down to the belly... a true trapezoid would be 4 sides.

How does all that sound?

Title: Re: How much crowning for a hickory board?
Post by: StickMark on February 04, 2019, 07:34:28 pm

now that I really look at it, maybe something between 6 and 7, 6.5 or so.  And the edges are still sanded that "pea"  roundness, so the cross section is not a true trapezoid. Interested in what others think.