The principle of ducted fans is well understood now. They require a duct
with correct tapering at each end and a low drag but powerful engine at
its core. Multiple-bladed propellers, or a fan as on a modern high-bypass
turbofan are needed for efficiency. Placing a Tiger Moth engine inside a fat
tube doesn't cut it. An Italian government engineer, Luigi Stipa, convinced
the Caproni Company to build an aircraft to test his theory that a tubular
fuselage gave significant extra thrust to a conventional engine and propeller.
The resulting Caproni-Stipa aircraft had a corpulent annular fuselage, which
concealed a Gipsy engine and two-bladed propeller. All this achieved was
high drag and low noise, although the landing speed was reduced to 68km/h. Performance was otherwise lower than a conventional airframe
with the same powerplant.
| ENGINE||1 x 120hp de Havilland Gipsy III inline piston engine|
| Take-off weight||800 kg||1764 lb|
| Wingspan||14.28 m||47 ft 10 in|
| Length||5.88 m||19 ft 3 in|
| Height||3.00 m||10 ft 10 in|
| Max. speed||131 km/h||81 mph|
|Gerardo Laguna, gerardolaguna=hotmail.com, 21.07.2010|
Digno de admirar... Yo construyo y vuelo aviones RC, y estos son los modelos que prefiero en honor a los pioneros de la aviacion y como tributo a su obra ademas de la curiosidad por comprobar sus logros.Ya construi y vole un Burnelli cpy3 (donde el fuselaje ayuda a la sustentacion, que genios!!!!) por eso mi siguiente proyecto sera este precioso avion. Felicitaciones.
Gerardo Laguna. Maracay, Venezuela.
Do you have any comments about this aircraft ?
FACTS AND FIGURES
© Stipa claimed that the outer fuselage
was profiled to generate lift. It was
said that this contributed 37% of the total.
© The Stipa's pilot and passenger had to
sit in cockpits perched atop the fuselage.
An inherent flaw in the design is that
there is little room for any payload.
© Humped surfaces around the
cockpits would have seriously
impeded the view of pilot and
passenger unless they leaned to one
side, which would have been
essential during take-off and landing.