![]() Most engines are designed for optimal performance either at Sea Level (the big ones that drive your first stage and boosters, which have lots of thrust!) or Vacuum (where they won't burn as much propellant, but can be VERY efficient). Because this depends on the pressure of a rocket's surroundings, this can change between Sea Level and Vacuum (in space). Specific impulse measures the efficiency of a particular engine. Specific Impulse (I sp) → See also: Specific impulse Most rockets, straight off the launch pad, will utilize a TWR between 1.5 and 2.0. If TWR is significantly above, say, 2.0, your rocket will ZOOM! But it might ZOOM too hard for your poor Kerbalnauts. You will need more engines, or perhaps MOAR BOOSTERZ! ![]() If TWR is less than one, then your rocket will not be going into space. ![]()
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