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Hi tech redneck flight bow.
Selfbowman:
Chuck I missed being at the shoot also. I heard it was a good one. I just barely broke the 50# complex composite record. It’s not easy shooting farther than a guy from Hungry . Stop trying to push that arrow another 5 feet and you will brake that record?🤠🤠 missed seeing everyone most of all. Great group of people from around the world!
Selfbowman:
After studying the bow more I realized I had left the last 6”” of the limb was to wide . I left it wider till I got my string groves in. Then the dumb cowboy forgot to narrow them causing the set at 18-19 inches from center of the bow. I narrowed the ends allowing the recurves to work more. The set stayed but the bow shot 199 grains 226 fps. So had I followed the design it would probably been spot on. It may still compete if I get good clean arrow flight.
mmattockx:
--- Quote from: Selfbowman on November 15, 2024, 07:55:59 pm ---After studying the bow more I realized I had left the last 6”” of the limb was to wide . I left it wider till I got my string groves in. Then the dumb cowboy forgot to narrow them causing the set at 18-19 inches from center of the bow. I narrowed the ends allowing the recurves to work more. The set stayed but the bow shot 199 grains 226 fps. So had I followed the design it would probably been spot on. It may still compete if I get good clean arrow flight.
--- End quote ---
How much extra width was there? It doesn't take much to screw things up if you have everything right to the limit of the material. Great news that you found a reason why things went the way they did. Not knowing what went wrong is far worse.
Mark
Selfbowman:
Mark I took off about 1-16 inch off each side from tips to nothing at 5-6” length. It was enough to make a difference for sure. Making working recurves in all wood bows are a challenge to say the least. I learned from the build though. This is my second try at this if I don’t run out of good wood staves that will make good candidates for a build I might get this right yet. The next one I will get the engineer to give me projected bend profile every 4” of draw length. I noticed the force draw and bend profile came real close to the design. Mark do you have both force draw and bend profiles in your design? And if so would you check the profile design vs force draw on one of your bows and see how it came out. I’m curious about this because thickness will be a lot less of an issue when tillering.
mmattockx:
--- Quote from: Selfbowman on November 17, 2024, 02:10:23 pm ---Mark do you have both force draw and bend profiles in your design? And if so would you check the profile design vs force draw on one of your bows and see how it came out. I’m curious about this because thickness will be a lot less of an issue when tillering.
--- End quote ---
Arvin,
I'm not really equipped to do an F/d chart on my tillering tree and I've never compared the bend profile of a bow to the predicted one. The last lam bow I did I was using Perry reflex to try and improve performance and I have no good way to include that in the analysis, so the bow I made was not really identical to the design version. When I get done building a garage and other infrastructure projects I would like to do some bows without the Perry reflex, just to see how they compare.
The design equations used are well proven to match reality, though, so as long as the bow dimensions are accurate and the wood properties consistent throughout the bow there is no reason for me to think the design and the actual bow won't very closely match each other in the end.
Mark
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