Quiz n° 21 E ora un quiz storico, di quelli interessanti (il file zip contiene lo schema dell'aereo):
Eh... che aiuto posso dare... vediamo... Dunque: è russo, progetto iniziato alla fine dei '30 e ha volato prima di Barbarossa, la particolarità sta negli abitacoli separati ma in comunicazione con interfono, uno dei pochi bombardieri russi progettati in questo modo, dovrebbe essersi fermato allo stadio di prototipo (almeno 4 esemplari) però ho trovato anche una citazione su una veloce costruzione in serie per 28 esemplari, cosa di cui dubito parecchio... Il resto è solo ricerca, io l'ho trovato su un'archivio di foto di aerei strani e mi ha incuriosito e prima di conoscere la denominazione ho dovuto sbattermi un bel po'...
Se ce lo dà come bombardiere.. Io son fermo col Tupolev.. Almeno è solo lì che ho visto quel tipo di elica e carenatura per il motore in stile "caccia americano anni '30" (era il mustang?) anche con la russia ci avevo preso. E con la cronologia ci avevo pure beccato.. ma non trovo una mazza..
Pensa che lo stesso Gy ha avuto difficoltà trovare notizie su questo velivolo per il quiz...figurati noi!!!!
eheheheheheheh, no no esiste esiste, o meglio è esistito, domani posto la soluzione Comunque seguendo un vecchio consiglio, se non lo trovi nei modelli normali allora è un progetto andato a male o un'arma segreta in questo caso è entrambi, un progetto di un arma segreta andato a male
Ricorda che noi non abbiamo "l'archivio universale dei sistemi d'arma dagli albori della civiltà a pochi secondi fa" e quindi ci mettiamo un pò più di tempo per risolvere i quiz...
Allora, si tratta del "Belyayev DB-LK" qui di seguito tutto quel che ho trovato su questo aereo, naturalmente in inglese, la fonte è "Russian secret planes" di Yefim Gordon: Purpose: The initials stood for 'long-range bomber, flying wing'. Design Bureau: Designer's own brigade at the Central Aerodynamics and Hydrodynamics Institute. Viktor Nikolayevich Belyayev, born in 1896, began his career as a stressman in the OMOS bureau in 1925. He subsequently worked in AGOS, KOSOS-CAH1 (TsAGl), the Tupolev OKB, AviAvnito and Aeroflot. He liked tailless aircraft, and had a fixation on a 'bat wing', with slight forward sweep and curved-back tips, which he considered not only gave such aircraft good longitudinal stability but also minimised induced drag. He tested such a wing in his BP-2 glider of 1933, which was towed by an R-5 from Koktebel (Crimea) to Moscow. In 1934 he entered an AviAvnito competition for a transport with a design having twin fuselages, each with a 750hp Wright Cyclone engine and ten passenger seats, but this was not built. From this he derived the DB-LK bomber. Designed in 1938, the single prototype was completed in November 1939, but (according to unofficial reports) pilots declined to do more than make fast taxi runs, the aircraft being dubbed Kuritsa (chicken) in consequence. In early 1940 this unacceptable situation was ended by the appointment by GK Nil WS (direction of the air force scientific test institute) of M A Nyukhtikov as test pilot, assisted by lead engineer TTSamarin and test observer N I Shaurov. Test flying began in early 1940, at which time Mark Gallai also joined the test team. Nyukhtikov complained that the flight-control system was inadequate and that the landing-gear shock absorbers were weak. In the investigation that followed, the Commission agreed with the first point, but the Head of Nil WS, AI Filin, thought the landing gear satisfactory. He then changed his mind when a leg collapsed with himself at the controls (see photo). Later the main legs were not only redesigned but were also inclined forward, to improve directional stability on the ground and avoid dangerous swing. Later in 1940 the Nil WS ordered the DB-LK to be abandoned, despite its outstanding performance, and the planned imminent installation of l,100hp M-88 engines. Belyayev had by this time designed a refined version with 1,700hp M-71 engines, but was told that the DB-3F (later redesignated IL-4) would remain the standard long-range bomber. Belyayev left comprehensive aerodynamic details, showing that the strange wing was of CAHI (TsAGI) MV-6bis profile over the longchord centroplan (centre section) but Gottingen 387 profile over the supposed 'bat-like' outer panels. Overall aspect ratio was no less than 8.2, and the outer wings had a leadingedge sweep of minus 5° 42', with a taper ratio of 7. The airframe was almost entirely a modern light-alloy stressed-skin structure, the wing having five spars. There is evidence the structural design was modern, with most components pressed or even machined from sheet. The outer wings had flaps of the unusual Zapp type, extended to 45°, with Frise ailerons outboard, which even had miniature sections on the back-raked tips. Ahead of the ailerons were slats. At each end of the centroplan was a fuselage, of basically circular section. On the front of each was a Tumanskii (Mikulin KB) M-87B 14-cylinder radial engine (Gnome-Rhone ancestry) rated at 950hp, driving a VISh-23D three-blade variable-pitch propeller of 3.3m (10ft l0in) diameter weighing 152kg (335 Ib). The engines were housed in modern longchord cowlings, with pilot-operated cooling gills. Tanks in the wings and fuselages housed 3,444 litres (757.6 Imperial gallons, 910 US gallons) of fuel, with all tanks protected by nitrogen inerting. On the centreline at the rear was a large (7.0m2, 75.3ft2) single fin and a 1.94m2 (20.9ft2) rudder with a large trim tab. High on the fin, above the rudder, was fixed a small (0.85m2, 9.15ft2) tailplane to which were pivoted the enormous elevators of 4.8m2 (51.7ft2) total area, each with a large tab. Each fuselage was provided with a main landing gear, with a single oleo strut on the outer side of the axle for a single wheel with a 900 x 300mm tyre, with a hydraulic brake. Each unit retracted rearwards hydraulically. On the centreline at the rear was the fixed castoring tailwheel, with a 450 x 150 tyre. The intention was that the series (production) DB-LK should have a pilot in the front of the left fuselage, a navigator in front on the right, and gunners in each tailcone. The gunners, entering like the others via roof hatches, should manage the radio as well as pairs of ShKAS 7.62mm machine guns, with a ±10° field of fire in all directions. Two more ShKAS fired ahead on the centreline, aimed by the pilot, and for the six guns a total of 4,500 rounds were provided. Behind each maingear bay was a bomb bay, with powered doors (see underside view). Each could carry an FAB-1000 (2,205 Ib) bomb, or four FAB-250 (551 Ib) bombs, or many other smaller stores. Predictably, the full military equipment was never fitted, though radio was installed throughout the flight trials. Despite its strikingly unconventional appearance, the DB-LK appeared to be a practical bomber with outstanding flight performance. Compared with the established WS bomber it had the same number of similar engines, and even half the number of landing-gear oleos, despite having twice the number of fuselages and weapon bays. From today's distance, it might have been worth pursuing this formula a little further. Four views of DB-LK, one showing landing-gear failure. 24 Dimensions Span 21.6m 70 ft 1014 in Length 9.78 m 32 ft 1 in Wing area 56.87m2 612ft2 Note: various other figures for span (21.4 m) and wing area (59 m2) have appeared. Weights Empty (also given as 5,655 kg) 6,004 kg Normal loaded weight 9,061 kg Max loaded weight 10,672kg (also given as 9,285 kg) Performance Max speed at sea level, 395 km/h at 5,100m (16,730 ft) 488 km/h Take-off speed 1 45 km/h Max rate of climb 6.15m/s Time to climb to 3,000 m 8.2 min Time to climb to 5,000 m 1 3.6 min Service ceiling 8,500 m Range (with 1,000 kg bombload) at normal gross weight 1 ,270 km maximum 2,900 km Landing speed 1 50 km/h
"Belyayev" Va beh che in quanto a conoscenza della materia rasento lo zero e gooogle mi dà una mano grossa come una casa ma.. mai sentito.. mi fermo massimo a "Beriev".. :humm:
