Primitive Archer

Main Discussion Area => Bows => Topic started by: venisonburger on July 12, 2009, 01:14:16 am

Title: ERC
Post by: venisonburger on July 12, 2009, 01:14:16 am

Well, I roughed out an ERC bow, currently it's 2in wide for most of the length, nocks are around 1/2 inch right now it's 62in long, bend through the handle, I took the sapwood down to a thin 16th of an inch, rounded the belly and plan on putting rawhide on when I am done getting the deflex out and some reflex in. I guess my question is, should I leave the thin layer of sapwood on or just remove it completely, there are already spots where the heartwood is coming through. It wasn't a good candidate for leaving unbacked since the sapwood had worms burrowed into it. I'm shooting for 45 to 50 pounds.
this is my first attempt at ERC so any info would be appreciated
VB

Title: Re: ERC
Post by: Pat B on July 12, 2009, 01:49:17 am

If you are going to back with rawhide it doesn't matter whether it has sapwood on it or not. ERC sapwood by itself makes a good bow.

Title: Re: ERC
Post by: nugget on July 12, 2009, 08:20:28 am

I would leave the sap wood. It is a personal preference. I think it makes a nice contrast in color and the sap wood is beter in compression. Would love to see pics

Title: Re: ERC
Post by: Pat B on July 12, 2009, 09:17:00 am

TJ, you mean the sapwood is better in tension? ;)

Title: Re: ERC
Post by: venisonburger on July 12, 2009, 10:39:30 am

I like the idea of the contrast in color between the sapwood and hardwood also. I got some cow rawhide from someone awhile back so I'm going to use that. What about nocks, I think I'm going to try tied on wedge nocks, I saw that somewhere and I liked the looks. Maybe deer antler.
VB

Title: Re: ERC
Post by: Marvin Campbell on July 12, 2009, 10:47:43 am

Can't wait to see some pix

Title: Re: ERC
Post by: Pat B on July 12, 2009, 10:48:42 am

You will probably want to thin the cow rawhide before gluing it down. Cow rawhide it too thick, IMO, to use as a backing at its normal thickness. It will add unwanted physical weight to the limbs and tips.

Title: Re: ERC
Post by: nugget on July 12, 2009, 11:26:15 am

OOps my mistake. Too early in the morning and no caffiene or nicotine yet. Thanks for the correction Pat.  ;D
Deer rawhide is what I usually use on my cedar bows. If I was going to make a higher poudage bow I would use a tip overlay of some sort. Cedar is soft and the string might damage the wood. The cedar bows I have made so far have all been in the 35 to 45 lb range. I have not had one survive that was over that range. My next one will be a long bow stlye. 70inches long with a rounded belly.

Title: Re: ERC
Post by: Marc St Louis on July 12, 2009, 12:40:58 pm

I made this warbow out of a very nice piece of ERC a few years ago.  The sapwood was pretty thick so I took it down a few rings but was left unbacked.  The bow pulled about 120# @ 32". The drawn picture was all I could pull it back to

(http://img.photobucket.com/albums/v355/Marc-St-Louis/Selfbows/ERC/Warbow/BracedUnbraced.jpg)

(http://img.photobucket.com/albums/v355/Marc-St-Louis/Selfbows/ERC/Warbow/Drawn.jpg)

Title: Re: ERC
Post by: venisonburger on July 12, 2009, 10:38:21 pm

Hey Pat, would sinew be a better choice? At 62in I probably wouldn't gain anything except protection for the back which is why I would use the rawhide.
If I use the rawhide how would you thin it?
I got the deflex out now I have to correct some crookedness.
Then I'll be ready for backing
VB

Title: Re: ERC
Post by: Pat B on July 12, 2009, 11:21:47 pm

At 62" it ought to be quick enough. Rawhide is simpler and gives good protection. I have never sinewed an ERC bow. I do have a 49" ERC half heart/half sap that I plan to sinew.  I think you can use a belt sander to thin the rawhide. I always use deer rawhide because it is thin and strong.