Abstract
A theory for slender planing surfaces of general shape at high Froude number was formulated by Casling (J Eng Math (1978) 12:43–57). Although this theory was later extended by Casling and King (J Eng Math (1980) 14:191–205), it remains somewhat distant from application to actual planing vessel design. The present paper is an attempt to move the Casling theory a little in that direction. A modified formula connecting underwater hull shape and wetted planform is suggested here, which may be more suitable for numerical computation. Spraysheets and forces are also discussed, and a sprayless example hull is provided.
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