"weasel" wrote

My bad-

Yes, it's an R-2800, Pratt&Whitney 18 cylinder radial.
(It would've been nice if the second row was visible!!)

Indeed.

It looks like the view of the picture in question, with the angle given,
makes it difficult to get depth of the engine.

If it was a straight on view, the offset of a couple second row cylinders
could have been seen and made it easy to identify the engine.

If the view had been taken at a 90 degree angle from the shaft, then the
second row could have been identified from the offset of crank main throws.

It has always been my view that technical pictures should be taken with
straight views, like a 3 view drawing. It is much easier to take
measurements from a 3 view, if you are interested in taking measurements for
reproducing the object as a model, or whatever.
--
Jim in NC

Angles like the picture given are best left for artistic presentations, as
was probably intended.