ORIGINAL: Bish Wheeler
I need to cobble together a radial engine for a 1/4 scale Curtiss Goshawk (picture attached). I needs to be about 13 inches in diameter. Is there anything out there that I don't know about. The biggest I have been able to find is considerably smaller.
I did some reading after thinking about this, it was interesting to me as I am also into precise scale and want things to look "right". This is what I came up with:
P&W had three basic 9 cyl single row engines-
1-the Wasp Jr, at 985 c.i. and a diameter of 46.75 inches (comes out to about 11.7 inches in 1/4 scale)
2- the Wasp, at 1344 c.i. and a diameter of 51.375 inches (about 12.9 inches in 1/4 scale)
3- the Hornet, at 1690 c.i. and a diameter of 54.375 inches (about 13.6 inches in 1/4 scale)
They all had both geared and direct drive versions, the geared ones being about 300 pounds heavier than the direct drives, but with more horsepower.
the B-17 used Wright Cyclone engines, the single row 9 cylinder model R-1820.
I guess when Wms Bros and others make their scale dummy engines, they use a generic looking engine, or just chose one or the other models to go by, hence the disparity in the size you have found vs. the size you need for your model.