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Proper Spine

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scattershot:
Most of those charts are set up for compound shooters, even though they say they are for recurves and longbows. Good starting point above, 10# or so below bow weight, and go from there.

ricktrojanowski:
A big variable is the design of the bow.  A self bow that without a cutout for an arrow pass is going to require an arrow of less spine than a centershot bow of the same weight.  Like others have said the best plan is to experiment with various spines and point weights to see what shoots best.

HatchA:
Not forgetting the difference between American spine and European spine calculators/testers.  I've just spent the evening learning a valuable lesson in that...  U.S. 50-55# spine equates to 55-60# European spine  :-\

Just means I'll keep the shafts long and finish my bow to 60#

Del the cat:
That sounds back to front to me.
A longbow (assuming you mean English Longbow (as there isn't really anyother sort >:D ) Needs a lower spine generally as the arrow has to flex more around that big fat handle...there is no cut away or narrowing.
My 75pound longbow shoots 50 spine arrows fine and my little 40pound shoots 'em too as it has a pretty narrow grip.
(Mind this all has something to do with me being a lazy git who doesn't like making loads of different arrows! Generally the longbow shoots 11/32 shafts with heavier points, but it will shoot the light 5/16 with no prob.)
Del

Mechslasher:
list everything about your rig, that'll give us more to go on.  alot of bows will shoot alot of different spined arrows but to get the best accuracy/consistency, you will need to fine tune your setup.

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