The oft discussed outboard extra ballast revealed

[ebb]

For the record,
A-338 came with a form-fitted 120# pig with an iron ring in it exactly like the rings I cutoff that were sticking out of the 'encapsulated' ballast. It is shaped like Mike's (post 37) to fit right behind the end of the glassed-in ballast in the bilge.

Somebody must have really hated this little piggy because there are a bunch of hammer marks embedded in the S.O.B. top!
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The pig is 9" long - 7" tall - and 6" wide at the wide end.
Bathroom scale weight - 120#
A cubic foot of lead comes in at 708#
A cubic inch at .40969# at room temp.
Getting an estimate of the weight of the added pigs doesn't help with the curve of the bilge, does it? But maybe you could ballpark a guesstimate by averaging the angle at 45 degrees.....?