Bell XV-3

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

Galeria de fotos de um Bell XV-3, O Sino XV-3 (Bell 200) foi uma aeronave tiltrotor desenvolvida pela Bell Helicopter para um programa de pesquisa conjunta entre a Força Aérea dos Estados Unidos e o Exército dos Estados Unidos, a fim de explorar tecnologias de convertiplane. O XV-3 apresentava um motor montado na fuselagem com eixos de transmissão que transferiam energia para conjuntos de rotores de duas pás montados nas pontas das asas. Os conjuntos de rotores de ponta de asa foram montados para inclinar 90 graus da vertical para a horizontal, o que foi projetado para permitir que o XV-3 decolasse e pousasse como um helicóptero, mas voasse a velocidades mais rápidas, semelhante a uma aeronave convencional de asa fixa.

Fonte: Sino XV-3

Sino XV-3
Fotógrafos	Desconhecido
Localização	Desconhecido
Fotos	45

Click on a photo and use the mouse scroll to view all photos

Espere, Pesquisando Bell XV-3 fotos para você ...

Bell helicóptero Textron XV-3 andar ao redor
Fotógrafos	Vladimir Yakubov
Localização	Museu Nacional do Ar e do Espaço, Washington DC
Fotos	69

Sino-Helicóptero-Textron-XV-3-00001

Sino-Helicóptero-Textron-XV-3-00002

Sino-helicóptero-Textron-XV-3-00003

Sino-Helicóptero-Textron-XV-3-00004

Sino-helicóptero-Textron-XV-3-00005

Sino-Helicóptero-Textron-XV-3-00006

Sino-helicóptero-Textron-XV-3-00007

Sino-helicóptero-Textron-XV-3-00008

Sino-helicóptero-Textron-XV-3-00009

Carregar mais...

Compre-me um café

Veja também:

The Missing Link Between Helicopter and Plane

O Sino 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 o V-280 Valor, owes its existence to the data gathered by this fragile-looking machine.

Attribute	Technical Specification (XV-3)
Papel	Experimental V/STOL Tiltrotor
tripulação	1 (Pilot)
Motor	1 × Pratt & Whitney R-985-AN-1 Wasp Junior radial (450 hp)
Maximum Speed	291 km/h (181 mph)
Service Ceiling	4,570 m (15,000 ft)
Rotor Diameter	7.01 meters (23 ft) each
Envergadura	9.54 meters (31 ft 3 in)
estado	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.