Easton has a spine chart for their shafting. Maybe someone will post the link or you can use a search engine to find it.
Spine is "relative" and only a starting point from which you will need to tune for proper arrow flight. In general, a 2117 cut that short is going to be pretty stiff (high spine) and you will need a stout bow or heavy point to get clean flight.
With aluminum, I usually start with the bow and point weight and a full length shaft. Then cut 1/4" off at a time and test until it flies right. Or, try different points weights on the fixed length shaft until if flies.
TShirm, I don't know the answer but would think that at 27 1/2 they shouldn't be much heavier spined than at 28. The 2117 is still a pretty heavy spine that would compare to a wood arrow in the 75-80# range and a carbon in around 400 spine. I'm thinking if you shoot a bow in the 60-80# range they may work depending on your actual draw and point weight used. I used to shoot them out of 55# longbows but they were left longer. One of the aluminum gurus will come around and give you a much better analysis.
-------------------- Been There, Done That, Still Plowin. Cane and Magnolia tend to make good arrow. Hike naked in the backwoods. Posts: 2026 | From: Elba, Nebraska | Registered: May 2007
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