: [FlyRotary] Stainless 321 Tubing


> I'm having a heck of a time finding 321 Stainless mandrel bends in
anything
> larger than .049 wall. I'm trying to get 4 - 4" Center Line Radius, 90deg
> bends in at least .065" wall. I've tried calling 4 places and researching
a
> hundred others online and my last hope appears to be Woolf Aircraft
Products
> (http://www.woolfaircraft.com/).
>
> Is .049" wall beefy enough? If I recall, it seems that most people are
using
> material that is larger.  RacingBeat/MazdaTrix sell .125" wall but only in
> "mild steel" not stainless.
>
> Anyone else have any suggestions?
>
> Joe Hull
> Cozy Mk-IV N31CZ (65 hrs - Rotary 13B NA)
> Redmond (Seattle), Washington

Joe,
I'm using off-the-shelf cones for exhaust parts which are a mixture of 304
and 316 and are usually 1.6mm as a standard.

I know 321 has better resistance to heat and that .049 ( 1.25mm) is fine for
321. I also feel that 1.6 is also fine for 304 and 316.

I would only use mild steel if I expected to change it regularily.
George (down under)