Plasma Drive - Notable Plasma Drive Variants: Jovian Pattern Class 8.1 Drive - The Class 8 drives produced by the Jovian orbital shipyards are constructed from an incomplete STC discovered less than a millennia ago. Although they burn cooler than other Jovian drives, they are far more robust, able to absorb crippling damage without performance loss. These engines are typically reserved for military vessels, and the 8.1 is designed specifically for frigates.Jovian Pattern Class 8.2 Drive - Second in the Class 8 series of drives produced by the Jovian shipyards, the 8.2 is designed for light cruisers.Jovian Pattern Class 8.3 Drive - Third in the Class 8 series of drives produced by the Jovian shipyards, the 8.3 is designed for cruisers.Jovian Pattern class 8.4 Drive - Fourth in the Class 8 series of drives produced by the Jovian shipyards, the 8.4 is designed for grand cruisers. It is rarely produced due to the lack of new grand cruisers constructed by Imperial shipyards.Mezoa Pattern Theta-7 Drive - A logical progression of the trend towards ultra-fast clipper style engines, the Theta-7 is a massively powerful and hugely space-intensive civilian plasma drive designed purely for speed. The Theta-7 is constructed using potentially unsafe techniques that involve shoehorning deliberately semi-unstable plasma chambers into the cramped confines of existing transport vessels.Saturnine Pattern Class 4a "Ultra" Drive - The popularity of the battlecruiser concept led to a general acceptance that it was theoretically possible to overload the hulls of existing cruisers with weaponry capable of challenging the grand cruisers of previous millennia. The existing power-generating systems of most cruisers were simply not capable of supporting the immense demands of such upgraded systems, so cunningly redesigned plasma drives capable of being mounted within the confines of existing cruiser hulls were created by the Tech-adepts of Mars. These engines are now revered by many magi as the pinnacle of Human technological achievement in the realm of void propulsion.Saturnine Pattern Class 5 Drive - For over 10,000 standard years, the grand cruisers of the Imperial Navy have traversed the stars in stately majesty, huge and powerful vessels lined with banks of heavy weapons capable of destroying small moons. The power demands of these regal voidcraft are immense, necessitating gigantic engine rooms larger than whole transport ships. These drives are not space-efficient, but generate more pure power than anything save the engines of the mighty battleships.Voss Pattern Plasma Drive - On the Forge World of Voss, knowledge of the ancient technologies of magnetic containment fields, which are used to keep the vast energies of a plasma reactor in check, are almost a lost art. Thus, the Voss Pattern Plasma Drive separates the plasma reactor and the engine rooms from the main gundecks to provide more protection from a potential containment failure of the reactor. The result has been a loss of some efficiency compared to other drive patterns. For instance, the engines of the Endeavour-class Light Cruiser, which make use of this Voss Pattern drive, have been downgraded in power throughput to avoid extra stress and strain placed on the plasma reactor when the starship is travelling at maximum speed in realspace. The result is that the Endeavour-class Light Cruiser and its similar ilk using this pattern drive are considered slow for their class.