[AR] Re: Blank flare fittings
- From: George Herbert <george.herbert@xxxxxxxxx>
- To: "arocket@xxxxxxxxxxxxx" <arocket@xxxxxxxxxxxxx>
- Date: Mon, 14 Oct 2013 20:14:55 -0700
Found this - http://www.wipaire.com/pdf/service_manuals/1002552.pdf
Short summary - these floatplane floats are made out of 6061-T6 and
2024-T3, which are immersed. Alodined outside (chromate coating), plus
paint; just primed inside.
On Mon, Oct 14, 2013 at 8:10 PM, George Herbert <george.herbert@xxxxxxxxx>wrote:
> Looking around for more data on this, interested because Al is used
> extensively for seaplane and floatplane design without SCC issues. And
> they get scratched...
>
> (Amusingly - first ref I find on google, halfway through the paper, I stop
> and laugh, because they included (and cited) a diagram I did on Wikipedia
> describing Metacentric height on floating objects...).
>
>
> On Mon, Oct 14, 2013 at 4:21 PM, Ben Brockert <wikkit@xxxxxxxxx> wrote:
>
>> On Mon, Oct 14, 2013 at 5:01 PM, George Herbert
>> <george.herbert@xxxxxxxxx> wrote:
>> > 2024 is SCC sensitive? Or did you have another alloy in mind?
>>
>> "Alloys 7079-T6, 7075 -T6 and 2024 - T3 contributed to more than 90%
>> of the service failures of all high-strength aluminum alloys."
>>
>> http://www.keytometals.com/article17.htm
>>
>> Alcoa says it's much better in -T351 and -T851. Either way, anodizing
>> the parts after modifying them would be a fairly easy step to take if
>> you expect them to be in a corrosive environment. For the typical life
>> cycle of land-based amateur rocket projects it probably won't be an
>> issue.
>>
>> Elon: "First of all, it is important to appreciate that the
>> DARPA/SpaceX board finding – which was unanimous by the way, there was
>> no dissension – felt that the most PROBABLE cause was stress corrosion
>> cracking of an aluminum nut."
>>
>> Ben
>>
>>
>
>
> --
> -george william herbert
> george.herbert@xxxxxxxxx
>
--
-george william herbert
george.herbert@xxxxxxxxx
Other related posts:
