Just a minor correction, SC460 and SC800 are stages (like L110) that will be using the underdevelopment 2000 kn semi-cryo engine/s. RLV-TSTO will be using SC420 stage with probably 3 2000 kn semi cryo engines. ISRO will only think about lunar rocket once it completes development of semi-cryo...
The cryogenic engine cycles (see figure) normally used are gas generator cycle, staged combustion cycle and expander mode cycle.
Particular cycle is chosen based on consideration like engine thrust, duration, state of art available in the organization etc.
In the gas generator cycle...
Only slightly less efficient but far more efficient compared to other propellants.
India is developing both complex staged cycle (for GSLV MK2) and slightly less efficient but simpler gas generator cycle (for LVM3-X). Only Russia so far has been successfully using staged cycle engines. USA...
LVM3's payload projection under current configuration is: 10 ton (10,000 kg) to LEO and 4-5 ton (4000-5000 kg) to GTO
Now possible modifications and corresponding payload gain:
1) cryo stage twice restart capability, 500 kg gain
2) composite S200 boosters (currently marginal steel is used)...
subsystem level tests, like turbo pumps, thrust chamber etc done. hopefully by end of this year engine integration and cold & hot tests will be completed.
just making a correction: the LVM3-X mission that is supposed to take place in jan 2014, ISRO will be using a passive cryo engine with liquid nitrogen to simulate real engine weight. The experimenter wont involve testing the CE20 engine. it is only to collect data of LVM3 journey through the...