Just my opinion of course but .049 is plenty thick enough.
My original 321 SS header pipes were .035 wall and lasted 905
hours and were working fine when they were replaced. I sawed the
bends and measured the outside radius wall thickness and they measured
033 after all that time. The .002 reduction might have been due to
the stretching when they were formed around the mandrill for all I know.
Design the manifold to minimize thermal stress and cantilevered loads and
wall thickness requirements are not critical.
Tracy
----- Original Message -----
Sent: Wednesday, August 02, 2006 11:58
AM
Subject: [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
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