Russell Duffy wrote: 
> Greetings, 
> > As I ponder my choices for mounting the single rotor engine, I noticed > something that surprised me. 304 stainless is cheaper than 4130 steel. > One thing that's always bothered me about steel tube type construction > is the concern for rusting inside the tubes, so stainless is appealing. > There must be a catch here. > > Is there a good reason I should use 4130 instead of 304? Either will > likely be sized much larger than needed, since I don't have the means to > do any proper analysis of the strength. > > Thanks, 
> Rusty (Autoflight drive supposed to be shipping next week) 
> Well, after wading through all the replies, everyone seems to be ignoring the obvious answer: aluminum. :-) 
 
Sounds heretical, but there are AL mounts that have been flying for decades on certified a/c. IIRC, some of the bed mounts for Franklins are AL. 
 
Charlie 
 
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