Paul and Butch,

I know you both like the stiffening ring concept - but I don't.
I believe you like it because it adds strength and rigidity, I don't
like it
because it adds complexity, both in  terms of pattern fabrication and
machining.

How about a compromise to suit both parties !?

Firstly, my own design would benefit from a integral extension to the
housing to accommodate the Planetary. ( not unlike the Ross). This is
not my
original plan, but I can adapt and the benefit is one casting type.

This is a logical extension to your stiffening ring as the ring
become the
planetary housing which is separate in Tracy's design. In Tracy's
design the
tube is a separate component whereas with the new design, the drive
shaft
casting now bolts directly to the bellhouse extension  (shorter bolts
into
an internal flange or some other bolting arrangements).

I don't understand what limitations I have in this regard because I
don't
know the configuration and dimensions to Tracy's unit (other than the
bolt
pattern).

If you think this has merit - we can further discuss the other issues.

This design should  also provide more weight reduction overall.

I discussed the need for the necessary jigs to hold down the pattern
with
the local machinist (my Pommy Mate up the road). He tells me POM
stands for
Prisoners Of the Motherland.
Believe me Paul, there is a lot needed to hold this sucker down for
machining, however my suggestion will give a larger footprint - which
will
help.
This way I can hold down the machining costs, but I still have a
one-off
costs in the Jigs.
OK!
George (down under)

I need some sketches or drawings George.

Putting 12 one inch high ribs inside between Tracy's mounting bolts
would work well.
One rib between each bolt hole.  Run them all the way to the center
slug that holds
the shaft seal. The machine shop should like it as now the front
surface is completely
flat.

Paul Lamar

Here is what this would look like George if you put one inch high ribs
inside.
The outside would be perfectly smooth making the machine shop very
happy.

Paul Lamar

Now that's pretty.  Could even polish the outside & anodize it some cute
color - purple maybe.

Chris C.
microcosman.com/aircraft

 
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