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On my first game using civ2/3 rules, and reached the point of being able to launch my spaceship. However, although the odds are 100%, it's short of 4 modules. The time it will take is 11.9 years.
What to do? Launch, or build the missing 4 modules to get a swifter journey?
I chose to build the 4 modules.
Mistake.
The spaceship (complete) will now take 15 years. Still 100%.
This has to be a mistake. Surely, a complete spaceship should be making the fastest journey? Am I missing something?

It's heavier with the additional modules, so it's slower if you have the same number of engines to provide the thrust.

Lighter, yes, but also riskier. The chance of success should not be 100%.