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


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