September 8, 1961
Bulletin No. SB-865
Propellers
SUBJECT: A new optional propeller, #593437 (9½"x10")
75 h.p. V4S-12 thru V4AL-13F
The illustrated propeller is a new addition to the list of optional propellers for the subject V-75 engines. While the pitch is 10 inches, the blade area has been decreased by a reduction in diameter, thus permitting the engine to turn between the recommended 4400 and 4800 rpm on heavier outfits where the 10x12, 10x11 or 10¼x10 will not permit the engine to operate in this rpm range.
The Propeller Selection Chart for 75 h.p. engines has been accordingly revised to include this new propeller. In determining the propeller to be selected, be certain to follow the selection instructions in the lower, right hand corner of the chart, and give special attention to instruction No. 2. It is strongly recommended that engines be propellered to turn as close as possible to 4800 rpm at full throttle while carrying the
lightest contemplated load. As the customer then increases the load, the engine will drop rpm, but will more readily continue to operate within the recommended full throttle range of 4400 to 4800 rpm.
If the customer loads his boat to such an extent that engine rpm drop below 4400, it is again very important that a propeller with a lower pitch be used to bring rpm up into the recommended range. Here is an opportunity to sell an additional propeller... possibly two because a second propeller is recommended as a spare in the event of propeller damage.
The 9½"x10" propeller, #593437, is included in the current propeller exchange program with the same cash refund privilege as established in Service Bulletin #SB-746. This bulletin is still current and the requirements contained therein are also applicable to this new propeller.
Propeller #593437 is available from your parts distributor at the list unit price of $11.00. The standard parts discounts apply.
JOHNSON MOTORS
W. W. DeWees
Service Dept.
WWD:eb
NOTE: Post on your V-75 index.