Primitive Archer

Main Discussion Area => Bows => Topic started by: Aussie Yeoman on April 28, 2025, 08:03:16 am

Title: Gluing in deflex - not the result I was expecting!
Post by: Aussie Yeoman on April 28, 2025, 08:03:16 am
I'm shelving the plans to experiment with my other idea (http://www.primitivearcher.com/smf/index.php/topic,73157.0.html) to induce deflex, and have instead started to play around with just gluing it in with multiple layers.

In the past when I've glued in reflex, I found that the out-of-the-form reflex was about half, give or take, of the reflex in the form. So, thinking that's what would happen here, I deliberately made a form with twice the intended deflex for glue up, thinking it would spring back a fair bit out of the form.

Nope.

It kept nearly all of it! I guess that's what happens when you use lams of even thickness, instead of a thin boo backing with a relatively thicker stave.

I was originally going to make just a D/R bow, but given just how much deflex there is (about 4"), I'm thinking of adding some recurves too, which would mean needing less reflex.

The timber here is ironbark on either side of a maple accent strip.

Title: Re: Gluing in deflex - not the result I was expecting!
Post by: Selfbowman on April 28, 2025, 07:15:32 pm
Here is a computer design AVCase did and I built. It’s a good one.
Title: Re: Gluing in deflex - not the result I was expecting!
Post by: Selfbowman on April 28, 2025, 07:17:56 pm
The design that you have done is a great glass bow design. May work out fine.
Title: Re: Gluing in deflex - not the result I was expecting!
Post by: Aussie Yeoman on April 28, 2025, 07:32:24 pm
Oh yeah for sure - I'm confident I can make a bow from it. Just wasn't what I'd intended.
Title: Re: Gluing in deflex - not the result I was expecting!
Post by: Hamish on April 28, 2025, 09:15:18 pm
Very interesting. Looking forward to seeing how it turns out. What timbers are you using?
Title: Re: Gluing in deflex - not the result I was expecting!
Post by: Aussie Yeoman on April 29, 2025, 04:59:52 am
Ironbark on either side of a shim of maple.