The Caproni Ca.91 was a proposed Italian flying boat designed by Caproni.
Design and development Like the Caproni Ca.90, the Ca.91 had three tandem pairs of Isotta Fraschini Asso 1000 W-18 inline piston engines, but all three pairs were mounted on the lower wing.Gianni Caproni, Biplano Ca 90, in Gli Aeroplani Caproni - Projects Studies Realizations from 1908 to 1935, Milan, Edizioni d'arte Emilio Bestetti, 1937, pp. 229-45, ISBN not existing.
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