Reply To: 1941 Mercury KB-3 “Deluxe Prop”?

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January 26, 2023 at 11:11 pm #271843
green-thumbs
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    Well and GOOD!  It is a good idea to  use 3/16 ” brass rod for sheer pin stock. Steel pin has no give  so when prop strikes something at speed something else give$.

    The pocket in rear side of propeller hub should have a rubber disc and a washer with a smaller O,D, than the pocket so the prop nut can compress it and thus force the prop notch to tightly engage the sheer pin. Standard washer needs to be turned down to fit properly.

    There is a lot of fine detail thinking in Kiekhaefer design. Prop shaft was same from first K-1 in 1940 thru the last Wizard WG4.

    Louis