Bell XV-3

Bell XV-3
Country	USA
Type	Experimental VTOL aircraft
First flight	1955
Built	2

Galleria fotografica di un Bell XV-3, The Campana XV-3 (Bell 200) era un convertiplano sviluppato dalla Bell Helicopter per un programma di ricerca congiunto tra la United States Air Force e l'esercito degli Stati Uniti al fine di esplorare le tecnologie dei convertiplani. L'XV-3 era caratterizzato da un motore montato nella fusoliera con alberi di trasmissione che trasferivano potenza ai gruppi rotore a due pale montati sulle estremità alari. I gruppi del rotore alare sono stati montati per inclinarsi di 90 gradi da verticale a orizzontale, che è stato progettato per consentire all'XV-3 di decollare e atterrare come un elicottero ma volare a velocità più elevate, simile a un aereo convenzionale ad ala fissa.

fonte: Campana XV-3

Campana XV-3
Fotografi	Inconsapevole
Localizzazione	Inconsapevole
Foto	45

Bell XV-3 01

Bell XV-3 02

Bell XV-3 03

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Bell Helicopter Textron XV-3 Walk Around
Fotografi	Vladimir Jakubov
Localizzazione	National Air & Space Museum, Washington DC
Foto	69

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The Missing Link Between Helicopter and Plane

Le Campana XV-3 was a pioneering experimental aircraft that proved the concept of the tiltrotor. Developed in the 1950s for a joint Army and Air Force program, it sought to combine the vertical takeoff capability of a helicopter with the high-speed cruise of a fixed-wing airplane. While it never entered mass production, it successfully completed the world’s first full-scale conversion from vertical to horizontal flight in 1958. Every modern tiltrotor, including the V-22 Osprey E la V-280 Valor, owes its existence to the data gathered by this fragile-looking machine.

Attribute	Technical Specification (XV-3)
Ruolo	Experimental V/STOL Tiltrotor
Equipaggio	1 (Pilot)
Motore	1 × Pratt & Whitney R-985-AN-1 Wasp Junior radial (450 hp)
Velocità massima	291 km/h (181 mph)
Service Ceiling	4,570 m (15,000 ft)
Rotor Diameter	7.01 meters (23 ft) each
Apertura alare	9.54 meters (31 ft 3 in)
Stato	Experimental / Research

Design Engineering: Tilting the Paradigm

The Tilting Mast: Unlike the V-22 Osprey, which tilts its entire engine nacelle, the XV-3 featured an engine buried in the fuselage. A complex series of driveshafts and gearboxes transmitted power to the wingtips, where only the rotor masts tilted from 0 to 90 degrees.
The Radial Heart: Surprisingly, this futuristic concept was powered by a classic World War II-era 450-hp radial engine. The engine was mounted in the fuselage behind the pilot, which helped maintain a stable center of gravity during the transition between flight modes.
Evolution of Rotors: The XV-3 originally used three-bladed rotors, but they were found to be highly unstable due to “aeroelastic” vibrations (flutter). Engineers replaced them with two-bladed “semirigid” rotors, which allowed the aircraft to successfully complete its conversion tests.
High Disk Loading: Because the rotors had to act as propellers in forward flight, they were smaller than typical helicopter rotors. This meant the XV-3 required much more power to hover and had a very “sinky” feel during vertical landings.

Operational History: Proving the Impossible

The First Conversion: On December 18, 1958, pilot Bill Quinlan successfully moved the masts from the vertical to the horizontal position for the first time in history. This proved that a tiltrotor could actually transition between flight modes without falling out of the sky.
NASA Wind Tunnel Tests: After its flight test program ended in 1962, the XV-3 spent years being tested in the massive wind tunnels at NASA Ames. This research identified “proprotor whirl flutter,” a dangerous vibration that engineers had to solve before the next generation of tiltrotors (the XV-15) could be built.
A Brush with Disaster: During a 1965 wind tunnel test, a rotor failed and ripped off the wing, nearly destroying the aircraft and the tunnel. This failure provided the critical data needed to design the much stronger wings found on modern tiltrotors.
Where it is Today: The original XV-3 was painstakingly restored and now resides at the National Museum of the United States Air Force in Dayton, Ohio.