Singha wrote:Gslv mk3 has matched the ariane4 figure to gto and by attaching 4 boosters to first stage will it improve?
Sats are getting bigger for tv and internet but 7t to leo and 4t to gto should cover a lot of the addressable market
Some of the heavy sats are mil payloads and not launched outside of home country
Is there a mk4 being planned to match the arian5 gto?
An oversimplification type answer - with an existing set of engines/motors (developed after lots of years and expenses), it is not by increasing the size of lower stages or adding boosters alone
that increase the payload. It is usually done by increasing the upperstage's fuel load. If the fuel load goes up, the upper stage gets more burn time to accelerate a larger payload to orbital velocity. Once that part is settled, you add extra boosters to push up that heavier upperstage through the dense lower atmosphere at a structurally safe speed.
MKIII's CE stage's fuel loading is probably not full tank as of now and the upcoming semi-cryo stage will add more kick during the post-SRB phase, once it punches through the clouds. Stretching the cryo tanks is another option.
This is a young but really energetic puppy. Remember how PSLV evolved its payload to SSO from 900kgs to its current max payload of 1800kg? Good times ahead