Primitive Archer

Main Discussion Area => English Warbow => Topic started by: Kviljo on August 07, 2016, 04:52:27 pm

Title: Max grip thickness for BBI warbow?
Post by: Kviljo on August 07, 2016, 04:52:27 pm

For those of you who have been playing around with bamboo backed ipé warbows: what is the maximum thickness grip you have made? I'm thinking a general 2 meter length, and an optimal eliptical tiller bending through the handle. I recently made three:

one at 23mm which gave 85# @ 32"
one at 25mm which gave 100# @ 32"
one at 27mm which also gave 100# @ 32"

From the little string follow these bows gained, I suspect they can be made up to 30mm thick without getting compression marks, but I'd be interested in hearing if anyone here had some numbers for comparison :)

- Ivar

Title: Re: Max grip thickness for BBI warbow?
Post by: Badger on August 07, 2016, 07:42:51 pm

  I recently finished one that is 67" long and 102#@28", slightly bending handle area. I will measure it but might be too short for your purposes. Bow took no measurable set from original profile. I have high hopes for it this September. Following this one I built some white oak backed ipe bows at 50#, The thickness is no much differenence. The boo really makes a lot of difference,

Title: Re: Max grip thickness for BBI warbow?
Post by: loon on August 08, 2016, 02:29:19 am

that's really narrow... must be very nice to shoot, always wondered what a bendy boo/ipe bow would be like

Title: Re: Max grip thickness for BBI warbow?
Post by: FilipT on August 08, 2016, 03:42:28 am

I think he meant how thick grip was, not wide. Nice thing to see how just 2 mm can be a difference. Also, kudos to you Kviljo for using metric system haha

Title: Re: Max grip thickness for BBI warbow?
Post by: Badger on August 08, 2016, 05:58:22 pm

   My 102# @28" is 21 mm  67" long.  The 50# is 19 mm.

Title: Re: Max grip thickness for BBI warbow?
Post by: Kviljo on August 09, 2016, 05:56:14 am

That's a very short and heavy one :)  Interesting to see the difference that the bamboo made.

With the oak backing, I guess you are using flat growth rings, og even a single growth ring?

Title: Re: Max grip thickness for BBI warbow?
Post by: Badger on August 09, 2016, 08:58:57 am

  The oak is 1/4 sawn, I haven't had anything break yet but I have had problems with set and too much mass in the bows. I can't seem to get the mass down where I want it. Normally I would change the tiller shape to suit the mass inorder to maintain adequate width for stability but for some reason they all take some set when I do this.

Title: Re: Max grip thickness for BBI warbow?
Post by: Ian. on August 09, 2016, 09:46:27 am

How much do you round the back Steve? I've only ever used Hickory with Ipe but I using 2mm backings I tended to have good results.

Title: Re: Max grip thickness for BBI warbow?
Post by: Badger on August 09, 2016, 03:16:42 pm

 I round enough that the center 1/3 of the back is flat.