SIGNOR L. STIPA, of the Italian Air Ministry, started in 1927 an examination of a Venturi tube fuselage with an air‐screw placed at the mouth of the tube, which was so shaped internally as to conform exactly to the slipstream of the airscrew (Fig. 1). The slipstream, issuing from the rear part of the Venturi tube, should, according to his theory, supply an additional thrust (reaction) along the tube, thus increasing the airscrew thrust.
Giacomelli, R. (1933), "The Stipa‐Caproni Monoplane: Data from Model Experiments and Full‐Scale Tests of the Tubular‐Fuselage Aeroplane", Aircraft Engineering and Aerospace Technology, Vol. 5 No. 8, pp. 175-176. https://doi.org/10.1108/eb029704
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