What is recommended best practice for the firewall on a rotary, will
0.16 inch thick 301 stainless with fiberfrax be ok.
Is this combination good enough to buy time in case of accidental
exhaust fracture or something along those lines

Alex


You must mean .16 mm Alex. .16 inch would buy infinity :)
It would also weigh about 30 pounds.

.016 or .020 inch SS is mostly used.

Check out the bottom of the RENL web site front page. Some of the
parts are
coming in for the motor mount.

Paul Lamar


Sorry, typo, i meant to say 0.016"  The 0.16" would probably have
solved the aft C of G issue though :-)

I'll stick with 0.016" stainless then,

Alex

What sort of metal working tools does Team Tango have?
Is there a tig welder person near by?
We need to mod the nose gear mount.


Paul Lamar

Not much metalworking at TT, they have a lathe, drill press, bandsaw
and a tiny bending brake. For any tig welding we
can get it done in Gainesville by the guy who does the rest of TT's
work that they don't do in-house,

Alex

When the time comes we can remove the soob from the motor mount
and take the mount into gainesille so he can weld the nose gear brace
tubes.
I will fab the necessary brackets and bring them with me.

You should also start thinking about the oil pan. I have a guy
out here that can do a good job on an oil pan with rear motor mount
welded on.

Paul Lamar
The cheapest firewall material that still meet specs is galvanized
steel. That is what Zenith is using for the 750 and others, and they
must pass FAA fire regulations.Hell of a lot cheaper and easier to work
with than stainless or titanium or special steel.Regardless of
materials, your workmanship and method  installing the pass through will
determine how safe you will be.

For other high heat insulation, there is always rockwool, they look like
white fibreglass blanket insulation, lay it on and paint it with
rigidizer, it harden to like styrofoam, good to almost the melting point
of steel, they use this stuff for furnace refractory. Maybe to wrap
around the pipes after the exh. manifold to preserve the heat energy for
the turbo charger. Hot rod guys also use exhaust pipe wraps.
The thickness of the galv. steel is in my drawings, I have to phone
around to find who supply the rock wool. The wraps, ask any hot rod
shops. Ask and I will look up.
Tony Lam


Thanks Tony,i'd be interested to see those specs about the rock wool,
Alex




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