there was a PSRU by Tracy Cook advertised in Barnstormers at $2100
        including shipping to LA from Wisconsin….good price or not? Thx,
        Byron Head

        depends on the ratio. what is the reduction ratio?


        Paul Lamar

       says 2.85

       Byron Head

        Good deal. May have a minor problem but can be easily fixed.

       Paul Lamar

   Which SAE flange does Tracy's RD1C use again?

   Alex Molteno

   It is the big one for wood props.

   The following is a summary:

   SAE #1 0.375, 4.375, 5.5, 3.38, 0.624, 6, .375-24UNF-3A, 0.500, 0.500, 0.500

   SAE #2 0.375, 4.750, 6.0, 3.50, 0.624, 6, .375-24UNF-3A, 0.500, 0.500, 0.500

   SAE #3 0.375, 5.250, 6.5, 4.00, 0.624, 8, .375-24UNF-3A, 0.500, 0.500, 0.500

   The format of the above numbers is:

   Bolt Dia (in), Bolt Circle Dia (in), Flange Dia (in), Prop Thickness (in),
   Drive Bush Dia (in), Number of Bolts, Bolt Thread, Drive Bush Height (in),
   Bolt Minimum Thread Length (in), Max Distance of End of Bolt From Face of
   Hub (in)


   Paul Lamar

Thanks, that's just the data I was looking for

Alex Molteno



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