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By virtue of the Airone's robustness, Stelio Frati has already produced definite designs for a jet-propelled version powered by two Turbomeca Palas. The only structural modification would be the use of a slightly thicker plywood skin on the wing which would bring the maximum permissible diving speed up to 340 m.p.h. Mr. Frati of course already has the Palas-powered Caproni F.5 design to his credit. Since the Airone has no pressure cabin it would probably cruise at 13,000ft to 16,400ft using one engine only. With a pressurized cabin it would of course be faster and more economical to cruise at higher altitudes.

Source : Flight 13 July 1956