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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.
The RD-1 was a liquid-fuelled rocket developed from the ORM-65 by L.S.Dushkin and V.P.Glushko. Normal rating on RFNA/petrol was 300kg at sea level and more at height. In RD-1/KhZ (chemical ignition) form, extensively tested on fighters from 1943, eg the Su-7 (original version), Yak-3RD etc.