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Hi tech redneck flight bow.
Selfbowman:
Lord willing I will give you the chrono Results in the next three weeks. The crown of in the back is throwing a monkey wrench in the mix.
Selfbowman:
I have the profile done and need to put my string nocks in the ends. The engineer has been so kind to give me a force draw curve along with brace profile, 18” draw profile, and full draw profile. So I’m going to try to get close to thickness dimensions then follow the profile and force draw at that draw length. I have found that at 20” on a 28” draw the set comes in. So at 18” on this bow if no set and the force draw matches up . Then it will probably hit close to the 50@25”. If the design is correct to the point that no set should happen then I do my part hopefully we will have success. Has any of the computer design guys approached the tiller in such a manner with success????
mmattockx:
--- Quote from: Selfbowman on October 17, 2024, 11:43:45 am ---Has any of the computer design guys approached the tiller in such a manner with success????
--- End quote ---
I haven't. I trusted the design completely and just made the bow(s) to final dimensions as closely as I could, then put them on the tree and worked them out to full draw. IIRC, the maple bow I did this way I did actually do a bit of fine tuning on the tiller in the end, but very little. The red oak lam bow I just exercised out to full draw with no touch ups at all.
The big questions (for me, maybe not you and Alan) are how consistent the wood is in matching the bend test samples over the full length of the bow and how accurately the bow is made to the design dimensions. If these two things are good then you won't need more tillering than very small fine tuning adjustments, if anything at all.
Using laminations helps with the consistency of the material properties, but I don't think you are allowed to do that for your flight bow.
Mark
Selfbowman:
Mark did you do a force draw before or after or both. If so how accurate was your force draw computer design to final bow?
mmattockx:
--- Quote from: Selfbowman on October 17, 2024, 01:29:16 pm ---Mark did you do a force draw before or after or both. If so how accurate was your force draw computer design to final bow?
--- End quote ---
No full F-D chart, but the draw weight was bang on for the maple bow I did. I played around with preloading the lam glue ups in the red oak bow and ended up a fair bit heavier than predicted because I had no way to quantify what the preloading effect was going to be.
Mark
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