Avro Canada VZ-9 Avrocar | |
|---|---|
| Pays | Usa |
| Rôle | Véhicule expérimental VTOL |
| Premier vol | 12 novembre 1959 |
| Construit | 2 |
L’Avro Canada VZ-9 Avrocar était un avion VTOL développé par Avro Canada dans le cadre d’un projet militaire secret américain mené dans les premières années de la guerre froide. L’Avrocar avait l’intention d’exploiter l’effet Coandă pour fournir une portance et une poussée à partir d’un seul « turborotor » blowing exhaust out the rim of the disk-shaped aircraft. In the air, it would have resembled a flying saucer. Originally designed as a fighter-like aircraft capable of very high speeds and altitudes, the project was repeatedly scaled back over time and the U.S. Air Force eventually abandoned it. Development was then taken up by the U.S. Army for a tactical combat aircraft requirement, a sort of high-performance helicopter. In flight testing, the Avrocar proved to have unresolved thrust and stability problems that limited it to a degraded, low-performance flight envelope; subsequently, the project was cancelled in September 1961.
| Avro Canada VZ-9AV Avrocar Walk Around | |
|---|---|
| Photographer | Vladimir Yakubov |
| Localisation | National Museum of the USAF, Dayton |
| Photos | 39 |
Voir aussi :
Lla « Jeep of the Air »
Lla Avro Canada VZ-9AV Avrocar was a secret VTOL (Vertical Take-Off and Landing) project developed during the late 1950s. Funded by the U.S. Army and Air Force, the goal was to create a « flying jeep » that could hover over rough terrain and then transition into high-speed supersonic flight. It utilized a circular « flying wing » design that leveraged the Coandă effect to generate lift. Despite its futuristic appearance, the project faced massive stability issues and never managed to fly more than a few feet off the ground.
| Attribute | Technical Specification (VZ-9AV) |
|---|---|
| Rôle | Experimental VTOL Research Aircraft |
| Crew | 2 (Pilot and Observer in separate cockpits) |
| First Flight | November 12, 1959 |
| Groupe motopropulseur | 3 × Continental J69-T-9 Turbojets |
| Lift Source | 1 × Central 5-foot (1.5m) diameter Turbo-Rotor |
| Vitesse maximale | 56 km/h (35 mph) reached / 480 km/h (300 mph) goal |
| Diameter | 18 feet (5.5 meters) |
| Service Ceiling | 3 feet (0.91 meters) reached / 10,000 ft goal |
The Engineering of a Flying Disk
- The Turbo-Rotor: Instead of traditional propellers, the Avrocar used a large central fan driven by the exhaust of three jet engines. This fan pushed air out through a series of vents around the circular rim of the craft.
- The Coandă Effect: The aircraft was designed to stay aloft by blowing high-velocity air over the curved upper surface of the disk. This creates a low-pressure area that generates lift, similar to a standard wing but in 360 degrees.
- Vane Control System: Steering was accomplished by moving flexible shutters or « shut-off vanes » along the outer edge of the saucer. By blocking or directing the airflow in specific directions, the pilot could theoretically tilt or rotate the craft.
- Stability Challenges: The Avrocar suffered from « hubcapping »—it was inherently unstable once it moved out of the « ground effect » (the cushion of air beneath it). Without a tail or traditional control surfaces, it tended to oscillate wildly like a spinning hubcap on a floor.
A Failed Revolution
- High-Altitude Dream: The military originally hoped the Avrocar would be a Mach 3 interceptor. When testing showed it couldn’t even reach 40 mph, the project was scaled back to a tactical reconnaissance vehicle before being canceled in 1961.
- Noise and Heat: The three jet engines and the massive central fan made the Avrocar incredibly loud and kicked up massive amounts of dust and heat, making it impractical for battlefield use as a « jeep. »
- Survivors: Only two prototypes were built. One is currently at the National Museum of the United States Air Force in Dayton, Ohio, and the other is at the U.S. Army Transportation Museum at Fort Eustis, Virginia.
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