gang,
i shoot 2018's on my wing recurve which is 47# at 28", and they fly well for the most part.  would i shoot the same arrows off a longbow at the same poundage?  is there a rule of thumb to apply here?
THanks,
Aaron

Depends on WHICH longbow.

Killdeer  

what are the considerations?

Amount of center shot make a big difference.  You will need to add considerable weight to the point if it's not close to center.  How close is it cut to center.