April 16, 1963 Bulletin No. SB-952
SUBJECT: (A) Optional Propeller, part #379260 (10"x9¼") - List $11.00
(B) Propeller kit, part #379448 (10"x9¼") - List $12.25
75 H.P. V4S(L)-12 thru V4S(L)-15
75 H.P. V4A(L)-13 thru V4A(L)-15
(A). Figure 1 illustrates a new, optional 10" x 9¼" propeller for the subject engines and compares it with another propeller for these same engines. Note the difference in hub diameters. Because of the smaller hub on propeller 379260, it is essential that the following parts, figure 2, also be used whenever this propeller is installed:
1 ea. Part #309947 Propeller nut
1 ea. Part #309954 Drive Pin
1 ea. Part #309955 Cotter Pin
(B). To simplify handling, a kit including the four parts mentioned above is also available. This kit carries part #379448. It is also optional under the existing propeller exchange program, but only until further notice because of the price difference.
The thrust washer, part #304576, used with the new propeller and the kit is the same one used on the other V-75 propellers. IT IS NOT, HOWEVER, INCLUDED IN THE KIT, BUT MUST BE USED WITH THE NEW PROPELLER.
This new propeller should give improved performance on 17' to 18' runabouts where initial thrust for satisfactory skiing could not previously be accomplished. It should also be ideal for heavy cruisers where previously it was difficult to attain proper operating range.
Remember our recommendation that the engine be propellered to turn 4800 rpm as nearly as possible at full throttle while carrying the lightest contemplated load. Remember, also, the most efficient rpm operating range is 4400 to 4800.