On Sat, 24 Jun 2006 22:51:05 +1000, "......... :-\)\)"
wrote:

Hi,

Can anyone tell me what alloy is used for the manufacture of aluminium nose
bowls on aircraft such as the Luscombe or C-140 or J-3 Cub ?

Also how are they made (hand beaten, drop hammer etc ??)

I assume they are formed in the 'O' condition ? If so are the heat treated
subsequent to forming or is the strain hardening as a result of the forming
process enough to harden and strengthen the metal ?

Thanks,

Steve




Not sure what alloy is used, but when working one, it is NECESSARY to
anneal it occaisionally or you will crack the metal, so definitely it
is a work hardening alloy, and is LIKELY not heat treated for
strength.
I have seen cowlings worked up from 6061 on an english
wheel/plannishing hammer.


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