According to TsSKB-Progress press statements earlier this year the difference between Soyuz-2 and Soyuz-2-3 is the NK-33-1 (NK-33 with extendible nozzle) engine on the core stage.
Anatoly Zak was spot-on on his info about both PPTS and Rus-M. The crew Launch vehicle has capability of 23.8 tons to 200 km LEO. Boosters - 2 X RD-180 (Semi-Cryo)Core Stage - 1 X RD -180 (Semi-Cryo)Upper Stage - 4 X RD-0146 (Cryo) http://www.russianspaceweb.com/ppts_lv.html
Quote from: johnxx9 on 08/19/2009 10:24 amAnatoly Zak was spot-on on his info about both PPTS and Rus-M. The crew Launch vehicle has capability of 23.8 tons to 200 km LEO. Boosters - 2 X RD-180 (Semi-Cryo)Core Stage - 1 X RD -180 (Semi-Cryo)Upper Stage - 4 X RD-0146 (Cryo) http://www.russianspaceweb.com/ppts_lv.html No. First stage=3*RD -180 . Second stage=4 X RD-0146
It's the same! Eg. with Delta-IVH and Falcon-9H.
Three boosters separates as a uniform fragment.
Thus no need to throttle back the center engine or cross-feed propellants, eh? Also, does the open framework below the second stage imply "fire in the hole" style staging?