or even for one of the inside seals 20 or 21 disposed within the hull however it should be understood that seals of essentially similar configurations can be disposed in the alternate locations mentioned above for purposes of illustration the seal arrangement of the present invention is described in greater detail below with reference to the inner shaft seal 6 as illustrated in the accompanying fig2 and 3 a shaft bushing 9 can preferably be disposed about the inner shaft 8 this shaft bushing 9 can then preferably be torsionally connected in a conventional manner to the inner shaft propeller 5 by means of a flange 9 1 as such the shaft bushing 9 essentially connects the propeller 5 to the inner shaft 8 for rotation therewith a typical seal arrangement for sealing about a propeller shaft can generally provide that the shaft bushing 9 be contacted by at least one sealing gasket as shown in fig2 and 3 three gaskets designed as lip seals 10 1 10 2 10 3 can be disposed to contact the shaft bushing in essence the number of seals required can vary depending on the pressures to which the seals will be subjected etc the three lip seals 10 1 10 2 and.