Abstract
Equations have been derived to describe the functioning of a pumpjet propulsion system which is closely integrated into the hull design and ingests some portion of the boundary layer. The varying velocity of the inducted fluid is taken into account. The conventional treatment using separate hull and propeller performance coefficients which are unified by a defined hull efficiency is inappropriate to the treatment of an integral propulsion system. Rational analysis of this type of propulsor requires a unified treatment. Maximum advantage of an integral propulsor is only to be attained if full advantage is taken of the separation inhibiting effect of the propulsor on the boundary layer of the afterbody. A vehicle of given displacement without restrictions on hull form may achieve significant reductions of required power compared with a conventional hull and propeller.
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