It is almost ready to go into the foundry.
Been working on Tom Kendall's  pattern to add material in the flange
for the late 13B version, give a bit more turbo clearance and reduce
the weight. I think I may have got about a pound out of it. I'll know
more when we have some cast parts.  Here is a picture of the pattern

prior

to coating the modified areas with lacquer.

Paul what are you using to make the core from?
I assume this is a sand casting?
Royce

It is a sand casting. The foundry tells me if they told me the
secret formula for the sand cores they would have to kill me :-)
they claim it took them 30 years to develop it. They sure do nice
work. Just look at this three inch .140 wall elbow for turbo-charging

plumbing.

This is a sand cast work of art.

Paul Lamar

I suspect they coat the sand mold with chicken blood {:>)

Ed Anderson

It is something like that I am sure.

Paul Lamar

Don't laugh, but I actuall use mollasses in my cores. Bakes to a crusty form,
but
will break apart like glass.
Royce

I just knew it was some organic recipe like that. Probably discovered
300 years ago.

I can get you the recipe if you want it, works good.  Been helping my friend
casting some aluminium for his scale locomotive replica.

That's OK I will leave the casting up to the foundry.

Paul Lamar
 
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