In a message dated 2/28/2007 9:12:01 A.M. Eastern Standard Time,
rusty@radrotary.com writes:
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)
The 4130 can be gas welded. It will last longer than you will, if it is dry
inside when welded.
It is stronger than stainless in the same section.
You can wash the inside with Linseed oil and weld the hole shut when
finished. Then it will outlast all of us. You can use scrap 4130 from aircraft
salvage.
You can fix it anywhere there is a gas torch. Not just a TIG set. Rare at
little airports.
Check the Dillsburg aeroplane co. In Dillsburg Pa. for best new
prices.
Lynn E. Hanover