Was thinking about trying to build more foc. And looking at this I realized what the the max is. I had never thought about it. What is the max% you could reach.
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Obviously max foc is 100% like a bullet but that can't happen because we need a shaft.
I had an arrow built for my recurve that was at or near 50% it was very heavy and I was shooting 55lbs.
The problem with a compound is the fact that a compound is way more efficient than a recurve amd therefor requires a much stiffer shaft. A lower spine arrow of the same diameter must weigh more. Unless you want to shoot a 700+ grain arrow with a 70lb compound I don't think you can get an foc above 30%. At least not safely. If you go with too weak of a shaft and a heavy tip, it could spilter. Actually I haven't been able to get above 20% with a shaft under 500 grains. -
You would think max foc would be 100%. But it's not.Comment
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for some reason I think 50% would be the Max... Because no matter the weight there will be a point to where the tip weight (in front of balance point) is the same as the shaft weight (behind balance point). With an arrow having the point screwed in, the insert would be the balance point....Comment
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Yes and no. 50% is max foc. But the tip,weight will be much greater in weight then the shaft. I'm going to test this. But depending on shaft length of shaft. We may be talking 4 times or more that to get 50%.
I'm not talking about building The arrow. I'm just talking theory of the foc.Comment
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I think you can get higher than 50% just means the more than 50% of the weight of the arrow is past the center of the arrow. For instance a 30 in arrow with 0% foc should balance at 15 inches or exactly half the length of the arrow. As you begin moving the balance point past center you foc goes up.
The arrows i built were like 6-7 gpi had a 100 gr brass insert and 300 gr tip for 400 gr up front, it was partially footed with aluminum and they flew like darts.Comment
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Originally posted by muddyfuzzy View Post
23% @ 440 mass weight......next question....
Details of those arrows?Comment
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50% is max. The formula to find foc is a balance formula. When you make your first measurement your finding center. That is 100% of shaft but center is 50%. Of shaft. This is 0% of foc. So your working with half of shaft.Originally posted by bm22 View Post
Now let's use numbers. Take a 100% shaft is 30 inches. Center is 15 inches. This is center. 0%. Now say balance point is 7.5 in past center. You are now 25% foc. You now have 7.5 inches left to be the full 100% of shaft but we are only working with the front half. So since we are working with half the arrow if balance point is now say 15 inches in front of balance point. This is 100% of shaft but since we start in the center we are only working with 50% of arrow. Meaning from center to tip of shaft is only 50% of shaft I.e. 50% foc.Comment
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Rough drawingAttached FilesComment
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This discussion is making my head hurt.Comment
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Yes it does. I was explaining foc the other day and he thought if balanced it tip would be 100% foc. When I explained if I realized most don't know this. Course most don't even look at or worry about focOriginally posted by Doc Peter View PostComment
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Max foc
Originally posted by bm22 View Post
300 x-impact cut to 28.000" AMO. 42 grain outsert with 4" feathers and standard nock plus 165 up front.
When building an EFOC without going bonkers on over all mass weight it becomes very important to pay attention to ALL the components that one is thinking of using.Comment
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