Albert wrote:
Hi all
just a question that has probably been answered before in regards to the WAF...
Has anyone used stainless steel in say marine grade stainless. I'm guessing
that the stainless would be strong enough or would it need to be re-sized to
give the same strength as the 4130 steel.
Albert.
Albert & Netters,
Marine grade stainless steel in generally commercial grade 304 which has a
tensile strength allowable of 75KSI and a density of .286 pounds per cubic inch.
4130 has a tensile strength allowable of 180 KSI and a density .283 pounds
per cubic inch.
Why on earth would you want to fabricate such a critical, highly loaded
part of your aircraft with a material that weighs more and isn't as strong?
There is also no real practical reason to use stainless steel for this
application other than for the corrosion resistance properties. But of course
that has already been addressed in the 4130 WAF's by painting them before you
install.
If you are that concerned about corrosion resistance, then you could use
CRES PH15-7Mo which has a tensile strength allowable of 190 KSI and has a
density of .277 pounds per cubic inch.
CRES (Corrosion REsistant Steel) PH15-7Mo of course costs significantly more,
is harder to find and is a real bear to work with. But it is actually lighter
than 4130...
My recommendation is not to stray from plans in this area and utilize what is
proven to work. If memory serves, I believe that you can purchase your WAF's
directly from Rand-Robinson.
And as usual, your results may vary,
Scott
Scott Cable
Jamestown, ND
s2cab...@yahoo.com
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