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Max spine at front or rear?

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Don W:
i always assumed the measurement would be the back. That comes from thinking about how you taper a shaft to reduce the spine and when you barrel a shaft you barrel it forward. Also the middle is what flexes around the bow, so the front could theoretically be to stiff and not matter, but if the back was to stiff it would never paradox.

Del the cat:

--- Quote from: Don W on August 10, 2021, 05:36:39 pm ---i always assumed the measurement would be the back. That comes from thinking about how you taper a shaft to reduce the spine and when you barrel a shaft you barrel it forward. Also the middle is what flexes around the bow, so the front could theoretically be to stiff and not matter, but if the back was to stiff it would never paradox.

--- End quote ---
I see what you mean... that makes sense if you are starting with a heavy arrow... but from my perspective I'm starting with an arrow that is pretty much minimum weight to start with... so the question is where can I remove stiffness/weight without reducing it too much.
Del

Don W:
I would assume there would be a point forward where weight wouldn't matter, but I think arrow diameter would. To some degree, arrow diameter changes center shot. In practice however, that point may be far enough forward to not matter.

If the arrow is already on the verge of to light, I would think anything center  would have a dramatic effect, and a less effect as you neared the ends with some sliding scale where the back has more effect than the front. The back gets the brunt of the force, where the weight of the arrow causes the front to feel less trauma, so it could theoretically be lighter.

But I'm still on my first cup of coffee, so there may be a caffeine deficiency flaw in there.

Badger:
       
         Del, keep in mind my arrows have not been one of my strongest points but most of that is because I don't put any time into them. I always do them at the last minute. But what I have found in practice and seeing other successful flight arrows is that they tend to have a slight front to back taper. Seeing as how the front of the arrow has no weight and it tapered forward You don't really need to include that in your sprine measurement.So this would throw the spine to being weaker at the rear but I think the primary goal is the weight distribution and the taper, spine is just a side effect of that. As far as a starting pine would go I figured you are shooting about 80#
and the bow is about 1 1/8 wide. I think about 40# measured at 24" with the back of the arrow on one of the supports, should get you pretty close.

Del the cat:

--- Quote from: Badger on August 11, 2021, 05:19:16 pm ---       
         Del, keep in mind my arrows have not been one of my strongest points but most of that is because I don't put any time into them. I always do them at the last minute. But what I have found in practice and seeing other successful flight arrows is that they tend to have a slight front to back taper. Seeing as how the front of the arrow has no weight and it tapered forward You don't really need to include that in your sprine measurement.So this would throw the spine to being weaker at the rear but I think the primary goal is the weight distribution and the taper, spine is just a side effect of that. As far as a starting pine would go I figured you are shooting about 80#
and the bow is about 1 1/8 wide. I think about 40# measured at 24" with the back of the arrow on one of the supports, should get you pretty close.

--- End quote ---
Cheers
Del

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