Johnson Service Bulletin SB-976 - Propeller Identification

Issued September 3, 1963, this bulletin explains Johnson Motors' method of identifying accessory propellers by casting diameter and pitch directly onto a blade.

Johnson Motors Service Bulletin letterhead

September 3, 1963

SUBJECT:  PROPELLER IDENTIFICATION

You have probably noticed that the new accessory propeller (10 x 9ΒΌ) has the diameter and pitch cast on the surface of one blade. This change was made to make propeller identification simpler and more convenient for dealers and customers as well.

Presently, this method of identification is being used on two propellers and it will be incorporated in the others as tooling is revised.

Although the identification marks are raised on the working surface of the blade, they do not interfere, in any way, with propeller operation.

JOHNSON MOTORS
Robert Compton
Administrative Assistant

RC:eb

NOTE:  Post on your Miscellaneous Index.

Historical note

SB-976 documents the transition toward cast-in propeller size markings, intended to simplify identification for dealers and owners.