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Date: Sun, 18 Jul 2010 19:17:44 -0400
Subject: re: [FlyRotary] Re: Tie Down Hardpoints
From: "Thomas Mann" <tmann@n200lz.com>
Reply-To: tmann@n200lz.com
To: <flyrotary@lancaironline.net>
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Yeah ... I just know what I read.=0D=0A=0D=0AHere is the explanation I read=
:=0D=0A=0D=0A"The basic resistance of stainless steel occurs because of its=
 ability to form a protective coating on the metal surface. This coating is=
 a "passive" film which resists further "oxidation" or rusting. The formati=
on of this film is instantaneous in an oxidizing atmosphere such as air, wa=
ter, or other fluids that contain oxygen. Once the layer has formed, we say=
 that the metal has become "passivated" and the oxidation or "rusting" rate=
 will slow down to less than 0.002" per year (0,05 mm. per year).=0D=0A=0D=
=0AUnlike aluminum or silver this passive film is invisible in stainless st=
eel. It's created when oxygen combines with the chrome in the stainless to =
form chrome oxide which is more commonly called "ceramic". This protective =
oxide or ceramic coating is common to most corrosion resistant materials."=
=0D=0A=0D=0A----------------------------------------=0D=0A=0D=0AFrom: "Geor=
ge Lendich" <lendich@aanet.com.au>=0D=0ASent: Sunday, July 18, 2010 5:17 PM=
=0D=0ATo: "Rotary motors in aircraft" <flyrotary@lancaironline.net>=0D=0ASu=
bject: [FlyRotary] Re: Tie Down Hardpoints =0D=0A=0D=0A Thomas, =0D=0AWell =
that's a new one on me.  Sound to me you might be getting confused with Ano=
dized Aluminium. I know lower grade stainless can pit because of electrolys=
is in extreme environments and because of that they use 316 ( marine) grade=
. I know carbon grade stainless can rust =0D=0AHowever if anyone can confir=
m this I would appreciate hearing further about it. =0D=0AGeorge ( down und=
er) =0D=0AI think I want to stay away from the stainless because it will be=
 completely enclosed in fiberglas.=0D=0AStainless needs to be exposed to an=
 oxygen environment in order to for that protective layer (chrome oxide) th=
at prevents further oxidation.=0D=0A=0D=0AAt least that's what I've been to=
ld/read.=0D=0A=0D=0A----------------------------------------=0D=0A=0D=0A Th=
omas, =0D=0AI agree with Tony, use something that won't rust, nothing looks=
 worse on the exterior of a plane. Maybe consider stainless steel, I use it=
 on everything. =0D=0AGeorge (down under) =0D=0AHey Tony.=0D=0ANow I'm look=
ing for the tie down hardpoints (either parts or specs) referenced on page =
25 of the 'A' kit manual.=0D=0A=0D=0AI have not found them in the drawings =
either.=0D=0A=0D=0AThey say thay are Cad plated steel. I can have them made=
 but I would be guessing. =0D=0AMaybe .125  3" x 3.5" plate would suffice w=
ith a threaded steel bushing welded to it and then plated.=0D=0AI figure th=
e bushing threaded/tapped 1/4" x 28 could be 5/8" material ... maybe. ... o=
r 3/4".=0D=0A=0D=0AAny Ideas?=0D=0A=0D=0AThanks.=0D=0A=0D=0AT Mann =0D=0A=
=0D=0A

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Yeah ... I just know what I read.<br><br>Here is the explanation I read:<br=
><br>"The basic resistance of stainless steel occurs because of its ability=
 to form a protective coating on the metal surface. This coating is a "pass=
ive" film which resists further "oxidation" or rusting. The formation of th=
is film is instantaneous in an oxidizing atmosphere such as air, water, or =
other fluids that contain oxygen. Once the layer has formed, we say that th=
e metal has become "passivated" and the oxidation or "rusting" rate will sl=
ow down to less than 0.002" per year (0,05 mm. per year).<br><br>Unlike alu=
minum or silver this passive film is invisible in stainless steel. It's cre=
ated when oxygen combines with the chrome in the stainless to form chrome o=
xide which is more commonly called "ceramic". This protective oxide or cera=
mic coating is common to most corrosion resistant materials."<br><br><font =
face=3D"Tahoma, Arial, Sans-Serif" size=3D2>=0D=0A<hr align=3Dcenter width=
=3D"100%" SIZE=3D2>=0D=0A<b>From</b>: "George Lendich" &lt;lendich@aanet.co=
m.au&gt;<br><b>Sent</b>: Sunday, July 18, 2010 5:17 PM<br><b>To</b>: "Rotar=
y motors in aircraft" &lt;flyrotary@lancaironline.net&gt;<br><b>Subject</b>=
: [FlyRotary] Re: Tie Down Hardpoints</font><br><br>=0D=0A<div><strong>&nbs=
p;</strong><font face=3DArial size=3D2>Thomas,</font></div>=0D=0A<div><font=
 face=3DArial size=3D2>Well that's a new one on me.&nbsp; Sound to me you m=
ight be getting confused with Anodized Aluminium. I know lower grade&nbsp;s=
tainless can pit because of electrolysis in extreme environments and becaus=
e of that they use 316 ( marine) grade. I know carbon grade stainless&nbsp;=
can rust</font></div>=0D=0A<div><font face=3DArial size=3D2>However if anyo=
ne can confirm this I would&nbsp;appreciate hearing further&nbsp;about it.<=
/font></div>=0D=0A<div><font face=3DArial size=3D2>George ( down under)</fo=
nt></div>=0D=0A<blockquote style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; =
MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">I thin=
k I want to stay away from the stainless because it will be completely encl=
osed in fiberglas.<br>Stainless needs to be exposed to an oxygen environmen=
t in order to for that protective layer (chrome oxide) that prevents furthe=
r oxidation.<br><br>At least that's what I've been told/read.<br><br><font =
face=3D"Tahoma, Arial, Sans-Serif" size=3D2>=0D=0A<hr align=3Dcenter width=
=3D"100%" SIZE=3D2>=0D=0A</font><br>=0D=0A<style></style>=0D=0A=0D=0A<div><=
font face=3DArial size=3D2>&nbsp;Thomas,</font></div>=0D=0A<div><font face=
=3DArial size=3D2>I agree with Tony, use something that won't rust, nothing=
 looks worse on the exterior of a plane. Maybe consider stainless steel, I =
use it on everything.</font></div>=0D=0A<div><font face=3DArial size=3D2>Ge=
orge (down under)</font></div>=0D=0A<blockquote style=3D"PADDING-RIGHT: 0px=
; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARG=
IN-RIGHT: 0px">Hey Tony.<br>Now I'm looking for the tie down hardpoints (ei=
ther parts or specs) referenced on page 25 of the 'A' kit manual.<br><br>I =
have not found them in the drawings either.<br><br>They say thay are Cad pl=
ated steel. I can have them made but I would be guessing. <br>Maybe .125&nb=
sp; 3" x 3.5" plate would suffice with a threaded steel bushing welded to i=
t and then plated.<br>I figure the bushing threaded/tapped 1/4" x 28 could =
be 5/8" material ... maybe. ... or 3/4".<br><br>Any Ideas?<br><br>Thanks.<b=
r><br>T Mann </blockquote><br></blockquote><br>

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