Primitive Archer
Main Discussion Area => Bows => Topic started by: DC on February 11, 2020, 07:49:49 pm
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What happens when you pike a recurve? Let's assume you have 2" radius 90° hooks and the string lifts off right at full draw. Then you take an inch off each end and readjust the brace height. I'm thinking nothing will be different until the string lifts off but then my brain fails me. The hooks will no longer be 90° so the string lifts off sooner. Would this make a hump in the FDC or would it start to climb again? Would the DW go up? Any thoughts please?
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never thought about that. Interested in what people's thoughts are.
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Not sure but I am thinking this would only change the string angle after liftoff. Before liftoff angle is determined by the contact point on the bridge which hasn’t changed.
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I did it some,,.as the profile changed,,,the bow shot slower
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Not sure but I am thinking this would only change the string angle after liftoff. Before liftoff angle is determined by the contact point on the bridge which hasn’t changed.
Yeah, I said that, but no bridge, a nice smooth radius.
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I did it some,,.as the profile changed,,,the bow shot slower
Brad, did you readjust the DW?
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Pike it, then just steam in the same recurves.
That wasn't the question. I'm wondering about "shortening" the recurve.
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ohhh, Ok i getcha! sorry.
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I guess I added a bridge in my head. Now i think there will be a difference.
Like you said, when the original bow hits full draw it has just finished lifting off. Imagine adding 1” to the hook while drawn (now 118° of 2” radius hook.) That extra inch would not have lifted off yet, since it would be at a greater angle to the string than the part that just lifted off. So taking away 1” (now 61° of r=2” hook) should mean liftoff ends sooner because when the original bow is at full draw, that spot 1” below has already lifted off.
So I think the piked bow will finish lifting off sooner, but both will start lifting off together and otherwise have the same force draw curve up until the piked bow lifts off. (Because any tip beyond string contact is not participating) After the point where the piked bow lifts off, I would expect the piked f/d curve to take off more steeply than the original.
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DC,...I can't remember if I adjusted the weight,.just remember it was slower,.
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wait, are they static?
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I don't think you'll see a difference worth measuring except for the draw weight going up. I think people attribute too many features of hooks and siyahs closer to how a compound behaves. It's just not that dramatic.
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wait, are they static?
Yes
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I didnt take notes on that one,, and cant remember the details,, I was shooting through a chrono at the time,,I just remember the results were not positive,,that being said, I think it would depend on the bow,, or would vary depending on the bow,,,
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I don't think you'll see a difference worth measuring except for the draw weight going up. I think people attribute too many features of hooks and siyahs closer to how a compound behaves. It's just not that dramatic.
I'm not expecting a lot. I'm getting closer to 200fps and I'm looking for 1 or 2 fps gains. I'm finding that there is more change just from measuring errors/changes. I finished one yesterday that shot 194. That was 1 fps gain over my best. I shot it a few times and it was steady at 194. Then I remeasured the DW and found that it had lost a pound to 39. I dropped the weight of the arrow 10 gr and this time it shot 198. I was pumped. The next day the bow was back up to 40#. I trust my scale so I think it's the angle I'm looking at the string scale. It changes a bit depending on how much I want to bend over (lol) I know I'm being anal but inconsistencies like this bother me.
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40 lb bow shooting 194. What grain arrow are you shooting at what draw?
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maybe go down to 2 strands,, ;D
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I don't think you'll see a difference worth measuring except for the draw weight going up. I think people attribute too many features of hooks and siyahs closer to how a compound behaves. It's just not that dramatic.
I'm not expecting a lot. I'm getting closer to 200fps and I'm looking for 1 or 2 fps gains. I'm finding that there is more change just from measuring errors/changes. I finished one yesterday that shot 194. That was 1 fps gain over my best. I shot it a few times and it was steady at 194. Then I remeasured the DW and found that it had lost a pound to 39. I dropped the weight of the arrow 10 gr and this time it shot 198. I was pumped. The next day the bow was back up to 40#. I trust my scale so I think it's the angle I'm looking at the string scale. It changes a bit depending on how much I want to bend over (lol) I know I'm being anal but inconsistencies like this bother me.
The one pound difference is the wood recovering overnight. An organic bow is always going to have those slight variables, however tiny.
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so tomorrow it could go 200,,, :)
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40 lb bow shooting 194. What grain arrow are you shooting at what draw?
400 grains(10gpp)@ 28"
maybe go down to 2 strands,, ;D
I'm at six now. Continuous loop. Minimum serving. Minimum twists. Don't think it can be much lighter. :D I just ran out of Fast Flight and had to replace it with D97. It seems a lot heavier so I'm going back and reusing the FF from older bows.
I don't think you'll see a difference worth measuring except for the draw weight going up. I think people attribute too many features of hooks and siyahs closer to how a compound behaves. It's just not that dramatic.
I'm not expecting a lot. I'm getting closer to 200fps and I'm looking for 1 or 2 fps gains. I'm finding that there is more change just from measuring errors/changes. I finished one yesterday that shot 194. That was 1 fps gain over my best. I shot it a few times and it was steady at 194. Then I remeasured the DW and found that it had lost a pound to 39. I dropped the weight of the arrow 10 gr and this time it shot 198. I was pumped. The next day the bow was back up to 40#. I trust my scale so I think it's the angle I'm looking at the string scale. It changes a bit depending on how much I want to bend over (lol) I know I'm being anal but inconsistencies like this bother me.
The one pound difference is the wood recovering overnight. An organic bow is always going to have those slight variables, however tiny.
It's funny that I could accept that when the bows were in the 170-180 range but now I'm getting close to the big number I'm starting to get picky ;D ;D I guess I should stop that ;D
so tomorrow it could go 200,,, :)
Yeah but only because the DW was over 40#
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With those numbers you are quiet the builder.Good luck on your quest for 200 fps.
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With those numbers you are quiet the builder.Good luck on your quest for 200 fps.
Thanks, just standing on shoulders here :Dmaybe go down to 2 strands,, ;D
This needs a little more. When I first shot this bow it was with a Flemish D97 string that weighed 57 grains. It shot 193. Then I found the old FF continuous. It weighed 33 grains. Oh boy, I thought, this will help. It shot 194. 10grains of arrow equals 4 fps but 24 grains of string only equals 1 fps. Neither string has centre serving yet.
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your much closer to 200 than 100.. just call it 200 ;D
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Glad you brought that up about endless loop,and Flemish twist. My findings are same as yours. On the Wall one bow maker was making claims of 10 fps increase with endless loop strings when compared to Flemish twist strings all else being equal.
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I evened out the dimensions of the recurves and tips(made the bigger match the smaller) and gained 1 fps. 5 in a row at 195. 195 is a milestone, right ;D
Love this stuff ;D
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Glad you brought that up about endless loop,and Flemish twist. My findings are same as yours. On the Wall one bow maker was making claims of 10 fps increase with endless loop strings when compared to Flemish twist strings all else being equal.
That seems like quite a lot. The Flemish is heavier at the tips where the weight doesn't matter as much as at the centre so I don't see that there would be much diff. I've noticed that some bows respond more to removal of tip weight than others. No sure why.
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I could see how an endless string could add 10# over a Flemish string. About 80-90% of the Flemish strings I see are made up using a counter-clockwise twist. But the individual strands themselves have a slight clock-wise twist. Makes a fellow wonder...…..Art
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Archer 1 you mean 10 fps. If you have a chrony try it for your self, and post the results. That was not my findings at all. Tied properly one is as good as the other.Just another personal choice.
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Sorry, yeah, that should be 10FPS Bassman. A little slip of the finger there...…….
My chrony died of a bullet wound, can't draw a bow anymore, but there may be other ways to test the different string twist. Will post something if I find any difference...……..Art