Rich,

That's the conclusion I came to. I debated whether to mount my Wren SS in the tail or conventionally. I weighed the various components and measured their distance from the CG for both conditions. After a few simple calculations it told me that the plane would come out slightly heavier if I mounted the engine in the tail.

A P-60 or Super Bee are about 4 oz. lighter than my engine, so with one of those it might come out a wash or possibly slightly lighter in the tail.

Joe