X-11, X-12, Atlas missile forerunners

[archipeppe]

Archipeppe: I love your drawings but I think you got the X-11 and X-12 wrong.

Thanks for appreciation but I don't guess so, as usual I exploited solid reference to realize my artworks.

'd suggest you draw the following way
- X-11, 1 engine
- X-12, 3 engines
- Big Atlas, 5 engines

Nope.
The original "Big" X-11 had only one engine (1 sustainer), while the X-12 had the full five engines stack (1 sustanier and 4 boosters).
The "real" X-11 had only the 2 booster engines (no sustainer) while the X-12 had the full engines stack (1 sustanier and 2 boosters).