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From: "Al Gietzen" <ALVentures@cox.net>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: Tie Down Hardpoints
Date: Sat, 24 Jul 2010 18:22:52 -0800
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I know, an old thread, but; yes, the oxide layer that forms inhibits further
corrosion of the SS; but imbedding in epoxy (fiberglass) protects it even
better.

Al

>
> * *Thomas,
> Well that's a new one on me.  Sound to me you might be getting 
> confused with Anodized Aluminium. I know lower grade stainless can pit 
> because of electrolysis in extreme environments and because of that 
> they use 316 ( marine) grade. I know carbon grade stainless can rust
> However if anyone can confirm this I would appreciate hearing 
> further about it.
> George ( down under)
>
>     I think I want to stay away from the stainless because it will be
>     completely enclosed in fiberglas.
>     Stainless needs to be exposed to an oxygen environment in order to
>     for that protective layer (chrome oxide) that prevents further
>     oxidation.
>
>     At least that's what I've been told/read.
>
>
------------------------------------------------------------------------
>
>      Thomas,
>     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.
>     George (down under)
>
>         Hey Tony.
>         Now I'm looking for the tie down hardpoints (either parts or
>         specs) referenced on page 25 of the 'A' kit manual.
>
>         I have not found them in the drawings either.
>
>         They say thay are Cad plated steel. I can have them made but I
>         would be guessing.
>         Maybe .125  3" x 3.5" plate would suffice with a threaded
>         steel bushing welded to it and then plated.
>         I figure the bushing threaded/tapped 1/4" x 28 could be 5/8"
>         material ... maybe. ... or 3/4".
>
>         Any Ideas?
>
>         Thanks.
>
>         T Mann 
>
>
>


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