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67" Red Oak Lam Bow, 50lb @ 28"
mmattockx:
Apparently I am going to post one bow every fall... Hopefully this picks up now that I am done with building a house, moving and all the other upheaval of the last year.
I designed the bow using David Dewey's spreadsheet for the limb thickness and back profile. This bow is a Perry reflex experiment. It was glued up in 2 stages with the first glue up being the core and belly lams pulled into ~6" of deflex, then that assembly was glued to the back lam while pulled into ~2.5" of reflex. The goal was to minimize set while using a fairly mediocre bow wood. It finished all the gluing with ~1/2" of reflex. That pulled out while working it out on the tree and it has taken ~1/2" of set since so I figure that was pretty successful for a 50# bow from red oak boards.
I did no tillering at all, just cut the back profile to shape, glued on the handle and then exercised it out to 28" of draw. On the tree at first it looked very decent but the bottom limb has come up a bit weak when drawn in the hand after final sanding. I didn't bother checking tiller until it was done and it has a bit under 1/8" negative, so a bit of adjustment should have been done to make it optimal. Considering this was a quick and dirty experiment I am pretty satisfied and the bow shoots very nicely with no hand shock. Perfection will have to wait until the next round...
The tips are 5/16" wide for the outer 3" or so. A 0.100" underlay was added to the tips to stiffen them up a bit extra. Finish is tung oil, nock overlays are walnut and maple.
Mark
RyanY:
Looks great Mark. Where does the handle/arrow pass line up in relation to the limbs?
Hamish:
Looks like the spreadsheet works really well.
How does it feel, re handshock?
Not a fan of how the handle looks, but that probably doesn't effect performance, and it needs to be pretty deep to keep the shelf area strong.
Successful experiment, well done.
mmattockx:
--- Quote from: RyanY on November 27, 2021, 05:10:25 pm ---Looks great Mark. Where does the handle/arrow pass line up in relation to the limbs?
--- End quote ---
Pretty much the same as most around here. The deep part of the grip is the center of the bow and the arrow rest is not quite 1.25" above center. I did the channel to get the rest a bit lower but I'm not that crazy about the result and I don't think I am going to bother with that on the next one.
--- Quote from: Hamish on November 27, 2021, 05:31:34 pm ---Looks like the spreadsheet works really well.
How does it feel, re handshock?
Not a fan of how the handle looks, but that probably doesn't effect performance, and it needs to be pretty deep to keep the shelf area strong.
Successful experiment, well done.
--- End quote ---
No hand shock that I can tell. Of course, I am a hack that is not particularly sensitive but it is smooth for my hands. I am not crazy about the handle, either. It was an experiment as well and is too clunky looking and feeling for me to be satisfied with it. The next one will be less blocky.
Mark
mmattockx:
In replying to the questions, I realized I didn't put any pics of the grip area up...
Mark
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