limb stress
So here is a simple question I cannot figure out. If you take a 50 lb bow and cut the handle in half to sepperate each limb, and then hang a weight from the tip of each limb, how much weight will you...
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The question is pretty excitingDoes anyone have a mathematical formula that can calculate how much weight to be hung on one limp to simulate the real deflection? That wou...Read More
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As I see it you wouldn't be able to simulate a real bow by hanging a weight from one end because the forces on the nocks in actual use have two components at right angles to each other. When braced...
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You may have that right david, but would you mind running that by me one more time?
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I probably didn't put it very well. If 50lbs is needed to pull a bow to full draw then each nock will be pulled 25lb in a direction parallel to the arrow. Call this vertical. But each nock is also...
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I printed a chart in PrimitiveWays.com called A Foolproof Method for Bow Tillering that shows tip deflection for a given bow length and draw weight when you clamp the handle riser and hang a weight...
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So would that explain why it takes ( or seems to me anyway ) way more force than the draw weight of the bow to brace it?
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"So would that explain why it takes ( or seems to me anyway ) way more force than the draw weight of the bow to brace it? "Remember, when you are bracing a bow you could be very much out of position...
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I think the article answers the question nicely as to how much weight hung form the end of the bow is needed to determine the approximate draw weight of a bow, given the measured deflection for a...
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I just used a scale to measure the force to brace a bow. I put the lower limb on a scale, one hand on the handle, and the other on the upper limb. I then bent the handle in till the bow was at brace...
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That is a pretty good test depending on how much sideways force you apply at the handle. You probably need a bit of extra force to make the string slack enough to slip it onto the nocks, but the...
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To measure the force between the nocks when a 50lb at 27in bow is braced I arranged a spring balance so that it was part of the bow string. At the lowest brace, when the string was just lifting off...
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Let's see....where's my slide-rule? (OH, that really dates me)... never mind, I forgot how to work the dang thing anyway... Gary
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Sideways means in the direction that the arrow points, as opposed to endwise from one nock to the other. As I read Sleek's test, one end of the bow is on the scale (bathroom scale or similar) and the...
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Woodbear, if I test my string tension the way you described with no sideways force, I get 108.6 lbs of force to slack my string. Is that unusual for a 55 lb bow at 24 inches with a 5 3/4 inch brace...
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Actually, I have an Idea.... When I went through school for aircraft mechanics, we used a tool for the control surface cables to tell us how much tension they were under for adjustment reasons. I will...
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Sleek, the tension goes down as you draw the bow, you are ignoring the angles.
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Here's an excerpt from Pope's book on the subject: By putting a spring scale between one of the bow nocks and the end of the string, the unexpected phenomenon is demonstrated that there is greater...
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Sleek, I didn't draw the bow to get those increasing figures, I increased the brace height. David
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