Main Discussion Area > Flight Bows
FOC, center of pressure and performance
DC:
I think that it's the speed of the arrow rather than the poundage of the bow that determines the spine. In order to get to say, 180 fps the arrow has to accelerate at a certain rate. There is more involved than just bow draw weight. I believe that if you have a 70# bow that has a dry fire speed that is the same as a 30# bow the same spine arrow will work in both.
willie:
you might have hit on something with that observation, DC. Axial force is a function of acceleration.
I have been thinking of what constitutes a "clean release". If an arrow leaves the string with the nock in-line with the direction of flight, then what could be better? Of course how much an arrow nock oscillates laterally is both a function of the arrows stiffness and the displacement of the string rolling off the fingers.
avcase:
I wasn't the archer or bow builder for any of the flight records shot with the arrows I posted earlier. I was just the arrow guy. The bows were built by Steve Gardner, Dan Perry, and Larry Hatfield. The English Longbow records were shot with a couple of hickory-backed Ike bows that are just under 3/4" wide at the handle (no cut-in arrow shelf, of course). Steve can best comment on the degree of center shot his self bows and simple composite bows have. They usually have a shelf cut in to the handle. I think it is not quite to center. Same for Dan Perry's bows. Larry Hatfield's Modern Composite Longbows have a shelf that is cut in close to center, which still leaves the arrow off center by some amount.
Alan
willie:
--- Quote ---This is interesting. The weight for my larger diameter spruce flight arrow and equivalent stiffness of the split cane Tonkin arrow is almost identical.
--- End quote ---
Alan, are you saying the spruce and tonkin arrows spine about the same, and weigh about the same? Just the diameters differ?
.57 deflection 22" O.C. seems soft, especially for a 75# bow. Seems like the bows you mentioned did not necessarily need to have the arrows spined as soft as they are for getting around the handles. As a generality, are most flight arrows sacrificing as much spine as possible, for the aerodynamic advantage of having minimal diameter?
DC:
I'm sensing a Mass Principle for arrows.
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