enginehistory.org

[szielinski]

http://www.ww2guide.com/engines.shtml

Looking at raw data like this made me think about a parameter that might be discussed in the ultimate engine thread, namely kw/m2 (hp/sq. inch).
It would affect airframe design considerably.
(apologies if this is a common parameter to consider, I haven't seen it)

Displacement vs. frontal area isn't as useful as kW/m2.

eg just making a radial into a two-row doesn't double the result, nor making a flat 6 into a 12. Some designs simply won't accomodate row multiplication (like crank-cam barrel engines with non-sinusoidal piston motion).

...another $0.02 worth
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“Make everything as simple as possible - but not simpler” – Einstein.