Paul, is the RB part a comparable product. A casting versus billet
     CNC with what looks like a replaceable insert.

     Steve Carlisle

     No but the RB housings works on the TTC. And they are lighter.

     IMHO cast iron is not the best. The best would be 4130 Heat Treated
     and hard chrome plated.

     Paul Lamar

   Hi Paul,
   I spoke to Promaz a few hours ago and they are working on aluminum rear
   housings now and expect the first next week. They are planning center
   housings next and expect the whole set in about 3 months. The large 20B
   center housing is scheduled for production later in the year. The cast iron
   insert is hardened but Promaz did not say what hardening process is used.
   Maybe if we made our own 4130 insert, Promaz would install it. I can ask
   later when they sort out their present engineering plans.
   Rs,
   Dave Mccandless  in Perth

   Just a thought,
   The RB side plates have been around for some time and are tried and tested.
    Not so many in aircraft but plenty in race cars and drag cars.
   Cast iron can be induction hardened as many of the older lathe beds were, it
   can also be chilled hardened as used for blasting media.
   Andrew Campbell.

Dave, thanks for checking with Promaz. The wear plate being cast, may be profiled like the one Roger [Richard] Sohn  built. Harder to do in steel(4140). The insert maybe be a slip fit, held in by the rotor  housing.

Thanks, Steve Carlisle


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