Montag, 26. August 2013

Jodel DR-400 Robin - papermodel 1/72

The Robin DR400 is a wooden sport monoplane, conceived by Pierre Robin and Jean Délémontez. The Robin DR400 first flew in 1972 and was still in production in 2008. It has a tricycle undercarriage, and can carry four people. The DR400 aircraft have the 'cranked wing' configuration, in which the dihedral angle of the outer wing is much greater than the inboard, a configuration which they share with Jodel aircraft. This model is considered easy to fly by many and quiet during flight due to its wooden frame.

The Robin DR300 series were developments of the earlier DR.221 Dauphin and DR.250 Capitaine with a tricycle landing gear. The first variant was the DR340 Major, a tricycle landing gear version of the DR250 Capitaine which first flew on 27 February 1968, followed on 21 March 1968 by the DR315 Petit Prince, a tricycle landing gear version of the DR221 Dauphin. The DR315 was later replaced by the DR300. In 1972 an improved version, the DR400 was introduced with a forward-sliding canopy.

The wing is a distinctive feature of the Robin DR400, and is what immediately separates this aircraft visually from other similar light aircraft. It is a derivative of the earlier Jodel designs, is light, stiff and strong, with the dihedral of the outer panels imparting substantial lateral stability in flight. Being fabric covered, it presents a smooth surface to aid airflow, unhindered by the typical overlapping panels or rivets found on metal aircraft. The secret to the DR400's relatively high performance lies in the pronounced washout in the outer panels. Since they have a lower angle of attack to the airflow than the centre section, they create less drag in cruise flight. This characteristic also imbues rather benign stall behavior and the DR400 consequently does not suffer from the need to install retro-fixes like leading edge stall strips.

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Payen Pa-49 Katy - resin 1/72

The Payen Pa 49 Katy was a small experimental French turbojet powered tailless aircraft, first flown in 1954, was the first French aircraft of this kind and the smallest jet aircraft of its day.

The first flight of what was now the Pa 49A took place on 22 January 1954 at Melun-Villaroche flown by Tony Ochsenbein, a comparatively inexperienced pilot, who had previously logged only 30 minutes on jets. Ten hours of manufacturer's testing was followed, in April 1954, by assessment at the Centre d'Essais en Vol (CEV), Brétigny-sur-Orge. The aerobatic ability of the Pa 49 was established. At the CEV it was fitted with a split rudder airbrake; the two surfaces of the rudder separated from just below the tip, driven via faired external links near the bottom, into a V at the hinge for braking, rotating together for yaw control. This airbrake was designed by Fléchair SA, a company founded by Payen. At the time of its appearance at the 12th Salon International d'Aeronautique at Paris, in 1957, the undercarriage legs were faired and the main wheels enclosed in spats and the aircraft renamed the Pa 49B. For a time the nosewheel was also spatted. There were plans for a version with a retractable undercarriage, but this did not come about.
When the flight testing programme ended in 1958 Payen gave the aircraft to the Musée de l'Air et de l'Espace at Paris - Le Bourget Airport. He continued to design delta winged aircraft and the Payen Pa 71 and Pa 149 projects of the 1970s were direct developments of the Katy.

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Freitag, 23. August 2013

Vickers Wellesley Mk.I - Matchbox 1/72

The Vickers Wellesley was a British 1930s light bomber built by Vickers-Armstrongs at Brooklands near Weybridge, Surrey, for the Royal Air Force. While it was obsolete by the start of the Second World War, and unsuited to the European air war, the Wellesley was successfully used in the desert theatres of East Africa, Egypt and the Middle East.

The RAF received its first Wellesleys in April 1937, serving with No.76 Squadron at Finningley, and eventually equipped six RAF Bomber Command squadrons in the UK. Five aircraft with provisions for three crew members were modified for long-range work with the RAF Long-Range Development Flight. Additional modifications included the fitting of Pegasus XXII engines and extra fuel tanks. On 5 November 1938, three of them under command of Squadron Leader Richard Kellett flew non-stop for two days from Ismailia, Egypt to Darwin, Australia (7,162 mi/11,525 km) setting a world distance record. All three aircraft succeeded in breaking the existing record, but No. 2 aircraft landed in West Timor, 500 mi (800 km) short of the final objective. The Wellesley's record remained unbroken until November 1945. To this day, though, this flight remains the longest by a single engined aircraft.
By the outbreak of the Second World War, the Wellesley had been phased out from home based squadrons, with only four examples remaining in Britain, but remained in service with three squadrons based in the Middle East. Following the Italian declaration of war on 10 June 1940, the remaining Wellesley squadrons became involved in the East African Campaign against Italian forces in Eritrea, Ethiopia, and Somaliland.
Sudan-based Wellesleys carried out their first bombing mission on 11 June 1940 against Asmara in Eritrea. Although obsolete, the Wellesley formed a major part of the British Commonwealth's available bomber forces, mainly carrying out raids against Eritrea and Northern Ethiopia. In the early part of the campaign, fighter escort was not available, and when caught by Fiat CR.42s, proved vulnerable to the Italian biplane fighter. Despite this, the Wellesley continued to be used for bombing raids, bombing Addis Ababa from Aden on 18 August. The Wellesley continued in use against the Italians over East Africa until November 1941, when Gondar, the last Italian-held town, fell to Commonwealth and Ethiopian forces. The final Wellesley equipped unit, 47 Squadron was then switched to carrying out maritime reconnaissance duties over the Red Sea, continuing in this role until September 1942.
While the Wellesley was not a significant combat aircraft, the design principles that were tested in its construction were put to good use with the Wellington medium bomber that became one of the main types of Bomber Command in the early years of the European war.
In February 1940, three Wellesleys (K7728, K7735 and K8531) were sold to Egypt to serve in the Royal Egyptian Air Force.

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Freitag, 9. August 2013

Kawanishi E15K1 Shiun (Norm) - resin 1/72

Die Kawanishi E15K Shiun (紫雲, "Violette Wolke") war ein einmotoriges japanisches Aufklärungsflugzeug des Zweiten Weltkrieges. Der alliierte Codename für den Typ war "Norm" nach dem Squadron Leader Norman O. Clappison der RAAF, ein Mitglied der Allied Technical Air Intelligence Unit (ATAIU).



Im Jahr 1939 beauftragte die Imperial Japanese Navy die Kawanishi Aircraft Company ein zweisitziges High-Speed-Aufklärungsflugzeug zu entwickeln, das in der Lage sein sollte, den schnellen landgestützten Jagdflugzeugen zu entkommen. Es war geplant eine neue Klasse von Kreuzern auszustatten, die als Flaggschiff für Gruppen von U-Booten dienen sollte und sechs der neuen Flugzeuge betrieb, um Ziele zu finden. Der erste der neuen Kreuzer, Ōyodo, wurde ebenfalls 1939 bestellt.
Kawanishi entwarf einen einmotorigen flachen Eindecker, angetrieben von einem 1.420 PS (1490 PS) Mitsubishi MK4D Kasei 14 14-Zylinder-Sternmotor mit zwei gegenläufigen zweiflügeligen Propellern; die erste Installation von gegenläufigen Propellern in Japan. Es wurde ein laminares Tragflächenprofil gewählt, um den Luftwiderstand zu reduzieren. Es hatte einen einzigen Hauptschwimmer unter dem Rumpf und zwei
einziehbare stabilisierende Schwimmer unter den Flügeln. Der zentrale Schwimmer sollte im Notfall abgeworfen werden können, was eine ausreichende Geschwindigkeitszunahme (ca. 90 km/h) ermöglichen sollte, um feindlichen Jägern zu entkommen.
Der erste Prototyp des Entwurfs von Kawanishi, benannt E15K1 im Navy-Kurzbezeichnungssystem, machte seinen Erstflug am 5. Dezember 1941. Fünf weitere Prototypen folgten während der Jahre 1941-42. Bei den einziehbaren Stabilisierungsschwimmern traten Schwierigkeiten auf, was zu mehreren Unfällen führte, wenn die Schwimmer nicht für die Landung abgesenkt werden konnten. So mußte das System schließlich aufgegeben werden, wobei die stabilisierenden Schwimmer starr befestigt wurden und ein leistungsfähigerer Mitsubishi MK4S Kasei 24 Motor eingebaut wurde, um den erhöhten Luftwiderstand zu kompensieren.

Trotz dieser Probleme wurde die E15K1 als schiffstationiertes Bordflugzeug des Marine Typ 2 High-Speed Reconnaissance Seaplane Shiun 11 bestellt. Sechs wurden nach Palau im Südpazifik geschickt, aber diese wurden schnell von alliierten Kämpfern abgeschossen, da der abwerfbare Hauptschwimmer ständig versagte. Bei Windtunneluntersuchungen wurde das Schwimmer-Trennsystem nie an dem eigentlichen Flugzeug getestet. Dies führte zur Einstellung der Produktion im Februar 1944, mit nur 15 gebauten Shiuns, einschließlich der sechs Prototypen.

Quelle : https://en.wikipedia.org/wiki/Kawanishi_E15K