 estim forc moment roll slender tail configur superson speed estim forc moment roll slender tail configur superson speed veloc potenti span load correspond forc moment deriv theoret evalu number slender-tail arrang perform steadi roll motion superson speed method analysi base applic conform-transform techniqu util techniqu allow simpl determin complex potenti type two-dimension boundari-valu problem addit simpl often-us approxim roll deriv compar correspond exact valu determin method present report order wing-tail interfer flow field roll wing tail characterist illustr simpl wing-tail arrang 