Why is the word "block" used to indicate a rocket's version? Based on usage, I sort of understand what is meant, but I am confused why the word "Block" is used.
Examples:
- Falcon 9 Block 5
- SLS Block I
Why is the word "block" used to indicate a rocket's version? Based on usage, I sort of understand what is meant, but I am confused why the word "Block" is used.
Examples:
Essentially it just means "version". Example: the Apollo Command Module.
Sometimes in Europe they use "tranche". Example : the Eurofighter.
Other places sometimes use "Mark". Examples here.
Why is "version" not just good enough? Can't give definitive answer, it's probably rooted in corporate/industry history on a case-by-case basis.
It's just nomenclature the manufacturers chose, it doesn't mean anything in and of itself.