X-Mozilla-Keys:                                                                                 
Wrathall Mark wrote:

Snip

I'd use 4130 steel tubes, pickup the available mounting points (existing
studs or bolts, unused threaded holes, etc).  Looks pretty heavy
to me, and alum has no infinite fatigue life stress.  Just because it is
aluminum doesn't mean it is light.

Did you notice the mount for the small block V-8 on the Steen Skybolt in the

last Sport Aviation. Kind of a bed mount to pick up the automotive mount
points, with a third point out on the PSRU. Looked pretty tidy.

That was the September issue. Frankly I am not too impressed 
as it relies on a small tube in pure bending for the front mount 
that does little. The side mounts start out with the right idea but 
it looks like they are not  completely located by three or more tubes. 
Hard to really tell from the pictures as it looks like there are 
other tubes here and there.

It would be hard to design a nice clean efficient mount for that V
engine 
unless one went the P51 route. A large cantalevered beam made from
aluminum
or steel is probably the way to go. Steel was used in the Thunder
Mustang 
design and aluminum in the big block Chevy mount for the S51.
I am sure the mounts will outlast the engines in these cases :-)

Piping 871°C exhaust gases around heat-treated aluminium is also going
to require added effort

Yes that certainly will be a problem and Mike is giving it a lot of
thought.
 
Paul Lamar
 
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