Hi Paul

Long time follower of what goes on at your site, and only once or twice a
contributor--thought I'd throw in my views on displacement--As you folks
know, the displacement of a piston engine is the volume of the combustion
area of one cylinder without including the volume of the cylinder head (or
the volume of the area where the combustion occurs as with flat cylinder
heads, the combustion chamber volume in the piston).  This times the number
of cylinders gives the displacement.

I feel the Rotary should be sized by
the max volume of the combustion area on the intake just before compression
starts, times the number of rotors.

It makes no difference how many power
strokes ocurr per revolution or how much air/fuel mixture you can stuff in
before compression/combustion happens---you are just telling how much volume
is avail to make power!

Using that as a basis, the Rotary engine will have
a very small figure to represent displacement---Kinda goes along with the
external dimensions--The Rotary for it's size and weight makes a bunch 'o
power    John Pletting




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