Why not just simply link 2 engines together ? Using the right linking &
clutching/declutching
system you can get exactly what you are talking about, without getting
into special design
in the engines, the 2 engines together would be longer but it should be
simpler to create.
You may wind-up with a slight weight penalty, compared to doing it in a
single engine,
however if the engine/s are all alloy then it should not be too much.
This is not a new idea
and has been used before in things such as generator/s. Thanks to
computer technology
the ability to control this is much better than it would have been in
the past.

Regards David

One could also mix and match an RX8 with one of the smaller Midwest or so
engines, to get the small size and the low consumption on cruising.

Rolf


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