VKS-O

Russian winged orbital launch vehicle. Vertical takeoff, ballistic re-entry, single-stage-to-orbit, LOx/Kerosene/LH2 tripropellant rocket engine powered, reusable launch vehicle. 550 metric ton and 770 metric ton gross lift-off mass versions considered.

For the 550 metric ton version, dry mass of the launch vehicle would have to be 68,700 kg / 18 percent of the gross, with payload 8,500 kg / 1.5 percent of the growth. Payload would range from 2000 to 10,000 kg depending on the uncertainties in weight growth of the design during development. As in other vertically-launched SSTO designs, this was considered too great a risk, and the air-launched MAKS was selected instead. Velocity loss during ascent estimated at 1665 m/s compared to 1168 m/s for MAKS (payload 3.1% of gross).

LEO Payload: 8,500 kg (18,700 lb) to a 200 km orbit at 51.00 degrees.