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I'm using a lighter materials to rebuild plane, to cut down plane weight to 56kg and a 1.2m 3blades propeller.

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    – Zeiss Ikon
    Commented Apr 9, 2021 at 13:24
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    $\begingroup$ Are you asking about only having one engine on one side? That seems like a very bad idea... $\endgroup$
    – Ron Beyer
    Commented Apr 9, 2021 at 13:57

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With half the horsepower of the original, it will fly, but just barely, even allowing for a bit more thrust efficiency using a larger slower turning propeller. Your airplane may be 15 kg lighter, but the pilot's carcass is as much or more as a share of the total weight.

So figure on maybe, at best, 55 percent of the original's available thrust with a better prop, which like with most light twins, removes probably 70-80% of the thrust available for climb. The original could climb 1300 fpm, so the 15 hp version might manage 300-500 fpm, depending on how hot and high you were and how heavy the pilot is. Gain a little weight from excess beer and your climb margin might disappear completely if the weather is hot and you have a fun 3-wheel go-kart.

In any case, you wouldn't get me in a 15 hp Cri-Cri.

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Having flown paramotors with around 15hp on tap, you may find that a max rate of climb in the tens of feet per minute might be ok on paper but it makes for an awful flying experience.

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