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[Flying Pencil]

Originally Posted by robtek

Wright had the problem that the engines for the b29 (R-3350) should deliver 1hp/ibs.
To reach that goal they used magnesium in the engine housing.
The result were that a engine fire usually burned through the main spar of the wing,
with predictable results.

An exception becuase of the ill-conceived action to achieve a design goal (1hp per 1 Lb of engine weight, pressuring to cut corners)