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Seibel S-3

1947

 

 

Each of the two blades was attached to the rotor hub by means of a metal sheet bent so as to form an angle. Movements of this 'blade attaching angle', which could (as it were) be twisted, controlled pitch changes. There was thus no need for bearings, hinges, dampers, etc.

In addition, as stated above, lateral and longitudinal control were effected by changing the centre of gravity. By using a stick attached at its lower end to a swivel fitting to the fuselage structure, the pilot could displace his cabin, which was mounted on links, forwards, backwards or to either side.

This helicopter made its maiden flight on 20th September 1947.

Modificato 6 Gennaio 2009 da Blue Sky

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General Aircraft GAL47

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Hughes XH-28

1953 - project

 

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Ekonomov "Zhiroplan" 1936

 

Pavel Ivanovich Ekonomov, profesional aviation carpenter and joiner, was a prolific inventor and made various propositions while he was working at MAI in 1930s. In 1936 he constructed primitive but large rotary-wing craft with two contra-rotating sets of two-blade rotors (virtually large wings) of 22m diameter. Thick wing profile, each with aileron. Called Zhiroplan; never completed.

[Ospite Folgore88]

ricordo che c'era un elicottero USA copiato dal Mi24 negli anni 80 e dopo un incidente venne smantellato

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ricordo che c'era un elicottero USA copiato dal Mi24 negli anni 80 e dopo un incidente venne smantellato

 

 

Se riesci a trovarlo e a postarlo, sarebbe interessante, anche perché io, questo elicottero, non lo ricordo proprio.

[Blue Sky]

ricordo che c'era un elicottero USA copiato dal Mi24 negli anni 80 e dopo un incidente venne smantellato

Per caso ti riferisci a questo Puma taroccato tratto dal film Rambo 3???

 

 

 

Modificato 6 Gennaio 2009 da Blue Sky

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Per caso ti riferisci a questo Puma taroccato tratto dal film Rambo 3???

 

 

Credo di no, ma ho letto, e l'ho ricordato solo ora, che uno Hind della Opfor americana, precipitò nel deserto del Nevada durante una esercitazione. Chissà cos'hanno scritto i giornali italiani in proposito, scrivono ancora stazza invece di dislocamento...

Modificato 6 Gennaio 2009 da intruder

[Blue Sky]

Hunting Percival P.91

1954 - project

 

 

A model of the proposed 2-seat P.91 helicopter. This tip-powered machine may have been designed in 1954 to the Specification H.144T. Fairey Aviation Ltd built their Ultra-Light helicopter, but no production contract was ever placed.

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Farman F121 Jabiru bimotore (c'è anche trimotore, ed è, se possibile, ancora più orripilante)

[Blue Sky]

Kellett XR-10

1947

 

 

When it made its first nights in April 1947 this helicopter was the largest and most powerful designed for the United States Air Force at that time. Like the XR-8, it was of the "synchropter" type with contra-rotating and intermeshing rotors.

The rotors were driven by two engines mounted on nacelles on either side of the fuselage so as to leave the cargo space unobstructed, and cooling was by the flow of air induced through the nacelles. Rotor head linkage allowed the blades to pivot in the horizontal and vertical planes. In the horizontal plane, blade movements were damped by vibration dampers; the position of the blades was a function of the centrifugal force and the loading conditions, but there were, of course, stops to limit these movements. The rotors were synchronized through a cross drive between the upper transmissions.

One special feature of this XH-10 was its ability to fly on one engine with normal gross weight at altitudes of up to 1400 metres.

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Bratukhin B-10 1947

 

Also designated VNP (Vozdushni Nabludatyelnii Punkt - aerial observation point), this could have been AK-2 because its original role was to replace the AK in artillery spotting. In fact by this time the basic Bratukhin helicopter had become rather larger and potentially more capable and VNP was to be a multi-role machine able to fly recon, tactical supply and even casevac missions. Engines fully boosted AI-26 version, and dynamic parts essentially same as B-9. Wings of same plan and section as B-9 but with pair of bracing struts from bottom of two main-spar frames in fuselage to spar booms at 60% semi-span, and two further bracing struts from upper spar booms at same location to top of rotor masts. Fuselage entirely new: dural monocoque with glazed nose seating pilot on left and navigator on right under large observation dome; observer in tail again with large observation dome. New tail with variable-incidence tailplane mounted on fuselage carrying endplate fins(latter possibly rudders but not described as such in literature). Usual four-wheel landing gear. Central fuselage available for additional loads: three passengers, or two stretchers (room for more but weight-limited) or 200kg cargo or various radio or photographic equipment. Entrance door on left.

 

Single example built and flown 1947. Behaviour satisfactory, and complete performance measurements taken. Later fitted ShKAS at nose and tail. According to Shavrov 1947-48 saw general disillusionment with helicopters and especially with twin lateral rotor configuration.

 

 

 

Crew: 3, passengers: 2-3, engine: 2 x AI-26GRF pistone engine, rated at 575hp, rotor diameter: 10.0m, [b]take-off weight: 3900kg, empty weight: 3019kg, max speed: 218km/h, service ceiling: 6550m, hovering ceiling: 2200m,[/b] range: 440km

[Blue Sky]

Bell coaxial-rotor helicopter

1945

 

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Bratukhin G-3 1946

 

Third Bratukhin helicopter, based on G-2 but planned from outset for operational use by VVS as AK (Artilleriiskii Korrektirovshchik - artillery correction). No significant differences apart from more powerful engine. Two prototypes ordered 1944, flown 1945. On completion of State trials in 1945 batch of ten AK ordered. Soviet histories mention only original two prototypes as having flown. A single AK delivered to VVS with dual control for training helicopter pilots.

[Blue Sky]

Sud-Est SE.700

1945

 

 

 

 

During the war, SNCASE worked on an autogyro known as the SE.700, which flew for the first time in 1945. This three-seater could take off from where it stood by changing the pitch of the rotor. The airscrew was also of the variable-pitch type

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Sorrell SNS4

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Gluhareff MEG-3X

1960

 

 

Eugene Gluhareff established a development company in 1952 to carry out research into pressure-jet powered light helicopters. He built the MEG-1X personal strap-on helicopter rig which used a single-blade rotor with a tip-mounted G8-2 engine and followed this with the MEG-2X which had a two-blade rotor. His final design was the MEG-3X which was based on a dish-shaped platform on which the pilot would stand and a two-blade rotor revolving underneath the platform. No commercial development was undertaken.

 

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Kamov AK 1943

 

Discouraged by atmosphere of fear at CAHI which stultified design, Kamov took job of chief designer in factory at Smolensk opened 1939 to make production autogyros (beginning with A-7-Za). Obtained permission to undertake side-by-side observation machine with side doors. Tricycle gear, single fin rudder on struts from rotor head and main gears, no wings. Delayed by evacuation July 1941 but work restarted at new facility in Lake Baikal region 1942. Abandoned 1943 because of termination of interest by VVS.

 

 

 

 

Engine: 1 x MV-6, rotor diameter: 13.5m, loaded weight: 1317kg, empty weight: 1026kg, max speed: 176km/h, ceiling: 4,700m

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Hiller X-2-235

1945

 

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Groen Revcon 6G

2001

 

 

TYPE: Utility autogyro.

 

PROGRAMME: Technology demonstrator development of Hawk 4. Will not be marketed. Announced late 2000 as Hawk 6G with an expected first flight (prototype N9112A) in January 2001; first flight eventually made 22 September 2001. Based around Cessna 337 fuselage with single 335kW Rolls-Royce 250-B17F2 turboprop in nose for propulsion, driving FC9684C-6RX three-blade propeller; Rolls-Royce 250-C18 above fuselage for rotation; inverted Cessna 337 tailplanes and shortened wing with spoilers and two-blade rotor system from Hawk 4. Estimated cruising speed 209 to 241km/h; useful load 907kg.

 

Aviastar

 

COSTS: US$950.000 (2003).

 

DESIGN FEATURES: Basically similar to Hawk 4.

 

FLYING CONTROLS: Broadly similar to Hawk 4.

 

STRUCTURE: Às Hawk 4.

 

POWER PLANT: Powered by a 335kW Rolls-Royce 250-C18 turboprop engine. Fuel capacity 416 litres. External tanks mounted at wingtips are modified Piper PA-24 Comanche wingtip units.

 

AVIONICS: Instrumentation: Full IFR.

[Blue Sky]

Jovair Sedan 4A

1963

 

 

Jovanovich persevered with the MC-4 design and after forming his own Jovair Corporation some years later produced N4071K in developed form as the prototype for a new 4-seat private or executive helicopter known as the Sedan 4E. The Franklin 6A-335 of 210hp was now installed and the fuselage offered comfortable accommodation and easy 4-door access to 3 passengers in addition to the pilot. A supercharged version, the Sedan 4ES, was offered with a 225hp Franklin 6AS-335. The Sedan 4E received type approval from the FAA in March 1963, and some two years later small-scale production of this version was begun; the current version, with a 235hp 6A-350 engine, is slightly heavier. In mid-1963 Jovair offered the stripped-fuselage Sedan 4A as an agricultural, training or utility cargo version, with provision for some 450kg of cargo or crop spraying equipment in place of the rear passenger compartment.

[Blue Sky]

Hoppicopter Model 103

1947

 

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Jovair Sedan 4A

1963

 

 

Jovanovich persevered with the MC-4 design and after forming his own Jovair Corporation some years later produced N4071K in developed form as the prototype for a new 4-seat private or executive helicopter known as the Sedan 4E. The Franklin 6A-335 of 210hp was now installed and the fuselage offered comfortable accommodation and easy 4-door access to 3 passengers in addition to the pilot. A supercharged version, the Sedan 4ES, was offered with a 225hp Franklin 6AS-335. The Sedan 4E received type approval from the FAA in March 1963, and some two years later small-scale production of this version was begun; the current version, with a 235hp 6A-350 engine, is slightly heavier. In mid-1963 Jovair offered the stripped-fuselage Sedan 4A as an agricultural, training or utility cargo version, with provision for some 450kg of cargo or crop spraying equipment in place of the rear passenger compartment.

 

Già postato #478, pagina 32

Modificato 7 Gennaio 2009 da intruder

[Blue Sky]

Kellett-Hughes XH-17 "Flying Crane"

1952

 

 

 

The XH-17 began as a ground test stand for a huge tip-jet-powered rotor system. In 1949, Hughes Aircraft got a contract to turn it into a flying machine. The giant rotors promised a huge lifting capacity, so they were attached to stilt-like legs and a box-like fuselage. Cargo such as radar vans could be driven underneath and lifted away. It was proposed that tanks could be carried this way, but as an operational aircraft the XH-17 was just too bulky and cumbersome to be practical and had a range of only 64km, well below the US Army's requirement. The rotor blades were subject to vibration stresses and the XH-17 was frequently grounded. After three years of sporadic testing, the whole programme came to an end when the one set of rotors reached the end of its design life.

[Blue Sky]

Bensen B-8 "Super Bug"

1956