public boolean isFusion(){
  if ((engineType == COMBUSTION_ENGINE) || (engineType == FISSION) || (engineType == FUEL_CELL)|| (engineType == NONE)|| (engineType == BATTERY)|| (engineType == SOLAR)|| (engineType == STEAM)|| (engineType == MAGLEV)) {
    return false;
  }
  return true;
}

public boolean isFusion ( ) { if ( ( engineType == COMBUSTION_ENGINE ) || ( engineType == FISSION ) || ( engineType == FUEL_CELL ) || ( engineType == NONE ) || ( engineType == BATTERY ) || ( engineType == SOLAR ) || ( engineType == STEAM ) || ( engineType == MAGLEV ) ) { return false ; } return true ; }
returns true if and only if this engine is a fusion engine
