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First stop would have too be the "Osprey Encyclopedia of Russian Aircraft 1875-1995" by Bill Gunston. According to it, the Tsybin LL gliders were flown with one PRD-1500 rocket motor. The PRD-1500 was a solid fueled rocket engine by I.I.Kartukov in time period 1945-49. Rated at 1.5 Tonnes at sealevel for 10 secs. The LL-1 had straight wings, reached 1050 KPH, the LL-2 had swept wings but was not completed, the LL-3 had 40 degree forward swept wings, reached a max speed of 1200 kph Mach 0.97.
One programme began in 1947 was the LL-3 rocket-powered glider, which was built with an FSW that had a 40 sweep. This provided an enormous amount of data on how FSWs performed. However, while several designs experimented with FSWs from the 1940s, all of these projects encountered problems due to wing divergence caused by the greater speeds made possible by the jet engine's arrival. Wing divergence is associated with loads on the wing of an FSW-designed aircraft encountered at speeds exceeding 0.9 Mach. Whereas an aft swept wing bends under a load and twists the leading edge downward, resulting in a reduction in the angle of attack capability and wing load, an FSW twists its leading edge upward, increasing its angle of attack and load. Depending on a number of factors, including speed and the sweep degree of the forward wing, the wing will fail and twist off the aircraft.
One of the strangest Luftwaffe aircraft to ever claw it's way into the air was the Junkers Ju 287. Begun in early 1943, the Ju 287 incorporated many advanced aerodynamic concepts, the most striking being the swept forward wings. This design feature was deemed radical enough to warrent the construction of a testbed aircraft, pictured above. This testbed flew on August 16, 1944. The aircraft was a Frankenstien's monster, pieced together from several diffent aircraft. Included were the nosewheels from two B-24 Liberators, the fuselage of an He 177, mainwheels off a Ju 352, and the tail was constructed of Ju 388 parts. 17 test flights proved the concept to have excellent handling characteristics and would have proven a problem had not the allies overrun the testing airfield, capturing the the V1 and the nearly complete V2. The V2 was flown by the Soviet Union in 1947. The V3 failed to get off the drawing board and would have had several improvements.