OK. The current 2 MN thrust semi-cryo engine that ISRO is planning to develop will according to me very very closely match the
RD-191 of Russia. The RD-191 is the basis of the Angara family and by seeing at this family of rockets we can imagine where ISRO's 2 MN rated engine goes---
First of all, specifications of RD-191
Dry weight : 2,200 kg
ISP (vacuum) : 337 sec
Thrust (vacuum) : 2,090 kN
Thrust (SL) : 1,920 kN
ISRO's 2 MN thrust engine could have very similar performance to RD-191.
Here are some of the Angara family launchers -----------------
Angara 3A
Boosters - 2 boosters each with one RD-191 (1,40,000 kg each)
Core Stage Engine - 1 X RD-191 (Mass of whole stage - 1,40,000 kg)
Upper Stage Engine- 1 X RD-124 (CE) (Mass of whole stage -25,200 kg)
LEO payload - 14 tons
Angara 5A
Boosters - 4 boosters each with one RD-191 (1,40,000 kg each)
Core Stage Engine - 1 X RD-191 (Mass of whole stage - 1,40,000 kg)
Upper Stage Engine - 1 X RD-56M (CE) (Mass of whole stage -25,200 kg) (Similar thrust rating to ISRO's CUS engine going on the present GSLV)
LEO payload - 28.5 tons
Therefore I am pretty confident that UMLV will have a configuration similar to Angara-5A
UMLV can be the following (Speculated figures)--------
Boosters - 4 boosters each with one Indigenous 2 MN thrust engines
Core Stage Engine - 1 X Indigenous 2 MN thrust engine
Upper Stage Engine - 1 X ICE
LEO payload - approximately
25 tons
NOTE: Only speculated figures