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8

The answer already posted is excellent. All I want to add is a follow-up question you might want to ask, and my answer to it. Q: OK, so those in particular aren't boosters. But would it ever make sense to use lots of tiny boosters instead of one big one? A: Yes, for two main reasons. One is the extreme expense of anything involved in space flight, and ...


33

Why would these be used instead of just using a larger first stage? Strapping on differently-sized boosters allows variance in payload mass without redesign of the first stage. The PSLV has flown with no (PSLV-CA), small as shown (PSLV-G), or big (PSLV-XL) solid boosters. PSLV-CA (no boosters) - can deliver 1100 kg to 622 km sun-synchronous orbit PSLV-G (...


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