A fictional [[flying boat]] in the [[Studio Ghibli]] movie and manga [[Kurenai no Buta]]. Based on the real-life "Macchi M.33":http://en.wikipedia.org/wiki/Macchi_M.33, it is a scarlet-red open-cockpit monoplane with a single overwing-mounted engine, a yellow underside and a fin flash that displays the Royal Italian Air Force [i]tricolore[/i] overlaid with the coat of arms of the city of Genoa.

There are three variations of the S.21. The original version can be seen in post #705377; post #740389 shows the version with the uprated engine and chin-type radiator. This also has provision for seating a single passenger in front. A third version with [[contra-rotating propellers]] was included with a discarded movie epilogue sequence. The S.21 was armed with two 7.92mm [[machine gun|machine guns]].
savoia s.21