Robin wrote:

Hello Paul,

    I hope this doesn't immediately sound like a dumb question, but how

can you find out exactly what the particular specifications for any given
"AN" part is?  For instance:  Metallurgist typically say there is just
about no difference between an American made grade 8 bolt and an AN
bolt.  Well, that's fine and dandy and we all can see that relationship
pretty well when you're talking about common fasteners,  but what happens
when you begin to talk about other products?  How can you really make a
sound comparison?

    Let's face it, we're building experimental airplanes and we do a

lot of things that wouldn't make muster for what we consider "AN" standards.

Robin

  I see a lot of "aircraft quality" stuff on factory built spam that would
make your hair stand on end. So I'm not particularly convinced that because
a factory or an A&P says that something meets "aircraft standards" that it
would also meet my standards.

  Seems to me that much of the stuff that you see these days on factory
built aircraft has evolved as a result of real world experience over the
past 50 years. But that is based on experience with horizontally opposed
recips and who is to say that those accepted practices and standards are
necessary or even appropriate on our rotary engine applications?

Mike Wills

 
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