Stipa-Caproni: The Flying Barrel With a Propeller Hidden Inside a Tube

The Stipa-Caproni of 1932 is one of the strangest aircraft ever built: a flying barrel with its engine and propeller sealed inside a hollow wooden tube. Italian engineer Luigi Stipa called it the "intubed propeller" — an early ducted fan built on Bernoulli's principle — and on 7 October 1932, with Caproni test pilot Domenico Antonini at the controls, the impossible actually flew. In this Impossible Aircraft documentary, we break down the Stipa-Caproni layer by layer: how the venturi duct was supposed to work, why Italy's Fascist government backed it for propaganda, why the Regia Aeronautica tested it at Guidonia Montecelio, why its top speed stalled at just 81 mph despite the theory working, and how its legacy lives on in the Kort nozzle and the modern turbofan engine. CHAPTERS: 00:00 The Aircraft With No Fuselage 00:35 What Is It? — A Barrel That Flies 02:37 Why Was It Built? — Stipa's Obsession 04:44 How Does It Work? — The Intubed Propeller 06:48 What Went Wrong? — The Drag That Killed It 09:11 Test Flights — 42 mph Landings 11:19 What Happened to It? — Scrapped in 1939 13:44 Final Verdict — Brilliant or Insane? SOURCES: Wikipedia, "Stipa-Caproni": http://en.wikipedia.org/wiki/Stipa-Caproni Wikipedia, "Luigi Stipa": https://en.wikipedia.org/wiki/Luigi_Stipa Vintage Aviation News, "Grounded Dreams: Stipa-Caproni — The Flying Barrel Prototype Left Behind": https://vintageaviationnews.com/warbird-ar... Vintage Aviation News, "Today in Aviation History: First Flight of the Stipa-Caproni": https://vintageaviationnews.com/warbird-ar... SimpleFlying, "Flying Cannoli: Why The Weird 1932 Stipa-Caproni Was Nearly The 1st Jet": https://Simpleflying.com/stipa-caproni-nea... PHOTOS: Wikimedia Commons, all public domain (historical Italian photographs, 1932): Stipa-Caproni.jpg, Stipa-Caproni 2.jpg, Stipa Caproni a terra.jpg, Stipa Caproni da dietro.jpg, Stipa Caproni profilo.jpg, Stipa-Caproni front quarter view.jpg, Stipa-Caproni side view.jpg, Caproni stipa in volo.jpg, Stipa Caproni in volo.jpg, Caproni Stipa on ground.jpg, Caproni Stipa from front.jpg, Fasi della costruzione della carlinga dello Stipa-Caproni 01/06.jpg. If you enjoyed this deep dive into aviation's strangest experiments, subscribe to Impossible Aircraft — new impossible machines every day. #StipaCaproni #WeirdAircraft #AviationHistory DISCLAIMER: This video contains AI-generated voiceover narration and AI-generated illustrative visuals (cinematic stills and diagrams) created to visualise a 1932 aircraft for which no motion-picture footage is known to survive. All historical claims are researched from the sources listed above. Altered content: YES.