Indian Space News and Discussion

[Arun_S]

Now that all Russian Cryo motors are expended, all future flights of GSLV will be Mk-II with Indian CUSP.



Communication failure between mission computer (located below the payload section (atop CUSP)) and first stage actuator will force ISRO to also plan for communication redundancy. While data cables entail weight penalty, and it is time to transition PHY layer from [url="http://en.wikipedia.org/wiki/MIL-STD-1553"]MIL-STD-1553[/url] to fiber optic based MIL-STD-1773. that has much smaller weight penalty; other electronics and upper layer firmware/software remain unchanged



Also note that first stage flight control is by using strap on L40 (liquid stage) nozzle. The Solid Core S128 stage has no control element.



BTW each stage actuator electrical power is sourced by a battery located on the stage (usually thermal battery), the hydraulic power is similarly local.





The next major milestone for ISRO is GSLV-Mk-III, the sooner they shift gear better they will serve Indian interest. Its a brand new rocket and does not carry the baggage of failures of GSLV Mk-I and Mk-II