From Italy comes word that an engineer named Secondo Campini has invented and tested a propellerless airplane driven by a jet of air. The plane draws air into a large duct in its nose, compresses and heats it in a tunnel.in the fuselage, and expels the air with great force from a jet in the tail. Thisshould not be confused with the rocket plane, in which tHe propblling force is created by the rush of gases from combustion of the fuel itself. In a test flight, the jet-propelled ship is reported to have flown from Milan to Rome in two and a quarter hours, averaging about 130 miles an hour.