User blog comment:Emilieanne.verhaegen/Eligius III in cryosleep?/@comment-35538378-20190523172525/@comment-40193977-20190806075758

Two engines does NOT mean double the speed! In space the engines are used to accelerate in a specific direction - engine OFF = acceleration OFF - but the movement continues (endless without resistence).

More math and more knownledge is required to understand space travel.