4130 is simply a better material for an engine mount. Lynn's comments
were pretty much on point, 4130 is stronger, harder and much tougher. Stainless usually
only is truly rust resistant if passivated or electropolished after welding.
The welding process brings some of the iron to the surface and the area around
the weld will rust in the area of discoloration. Stainless is VERY subject to
hydrogen embrittlement too. This can cause cracking on welded structures used
in vibrating assemblys. 4130 isn't as subject to H2 embrittlement. So there
are lots of reasons to use 4130. If the structure is suitably overbuilt this
might not be a problem, but you better be sure of that. A engine mount
failure is a VERY BAD thing on a autogyro.
Ernest,
""">
Thomas, I don't see the benefit of stainless being the protection of
the
> inside of the tube......""""
I don't like
stainless at all , unless there is no workable
alternative...
Rusty wants the bling on the
thing!!
Thomas
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