Montblack wrote:
BECAUSE of its design, the Cri-Cri flies quite well (control wise) on one
engine.

The Cri-Cri ...IS A REAL TWIN!+!


OK then I stand corrected.

But the question still remains: if there was a twin that happened to
have 2 engine, but absolutely could not be controlled with one engine,
should it be considered a twin?

Come to think of it, I don't think it would even matter. Any plane a
company wants to bring to market need to be certified and tested by the
FAA. I don't think the FAA would allow a twin to be sold in the US if
it couldn't be flown with one engine inoperative. An ultralight could
exist with this condition, but the FAA doesn't certify them (AFAIK),
but you don't need a certificate either. Are there any planes out
there that have two engine, but can't be flown on one?