The new airplane's propulsion wasn't as good because it crashed during the process.

Propulsion

Some synonyms for propulsion are drive, energy, momentum, power, speed, or thrust.

Propulsion is a noun, there is no antonym except 'no propulsion'.

The aircraft's propulsion comes from its engines.

A dog trots by means of propulsion with its four legs. Usually dogs walk with three legs on the ground at a time; dogs have two legs on the ground to save time while leaping.