Main Discussion Area > HowTo's and Build-a-longs

Sinew Backed, Double Curve Bow

<< < (24/25) > >>

JackCrafty:
Any time Orcbow!  I look forward to your post.

bootboy:
Aragorns bow is hard to find good photos of. I have been trying to find some myself to make it. In the movie it seems pretty powerful for such a small bow, he took a deer with it, and shot orks at retarded ranges. The bow itself looks really pretty to boot. This should be a lot of fun.

JackCrafty:
Last night I finished tillering the bow.  It didn't need much....just a slight bit of wood was removed from the belly of the upper limb to remove a flat spot.  I'll take pics tonight or tomorrow.

For now, I'll post some data.  Here are the draw weights of the bow during construction (in chronological order):

October 5th (reply#57), Draw weight = 29.8# @ 12" (after 1st layer of sinew dried)
October 5th (reply#58), Draw weight = 27.9# @ 12" (after initial tillering)
October 11th (reply#65), Draw weight = 27.8# @ 12" (after sinew dried for 1 week)
October 21st (reply#58), Draw weight = 29.3# @ 12" (after second course of sinew dried for two days)
November 18th (last night), Draw weight = 33.7# @ 12" (before final tillering and after sinew dried for about 1 month)
November 18th (last night), Draw weight = 30.3# @ 12" (after final tillering)
November 18th (last night), Draw weight = 30.2# @ 12" (after slight exercising - i.e. drawing bow 25 times)

Draw weight = 52.4# @ 18".  The final draw length will be 20" but I will exercise the bow out to 21".  It should be close to 60# @21"......almost reaching the final draw weight that I planned for this bow.

Mass of bow on October 21st = 14.55 oz.
Mass of bow on November 18th = 14.15 oz.

As you can see, the draw weight has increased due to the sinew.  This is a surprise for me, as I have not seen this before.  I thought about this last night (i.e. lost about an hour of sleep ::) ) and I think it has to do with the change in my environment.....it's really dry here in West Texas.  Prior to this, I built all my bows in a high humidity environment, and without a hot box or moisture meter.  The layer of sinew is about 1/16" thick and increased the draw weight by about 13%!  (from 29.3# to 33.7# after a month of drying)

JackCrafty:
Final tiller.

(picture is a view of bow drawn to 18").


I have not exercised the bow out to 20" yet.....and I won't take a picture at full draw (when the bow is on the tillering stick).  Normally, I don't hold the bow at full draw for more than second or two.

I shot the bow last night several times with a test arrow.  It's very fast but has a little more hand shock than I expected.  I will chronograph the speed later.

Now I will focus on improving my finger strength (this bow is more powerful than my other bows) and applying the finish.

orcbow:
Nice....I am impressed!!!!

Navigation

[0] Message Index

[#] Next page

[*] Previous page