SD Sports (Apocalypse)
The top of the line engine for very small airbourne vehicles. Sold by Super Dynamics. The power of this engine is extreme over the SD Standard. Performance is excellent, acceleration is excellent when used for its intended purpose - to power Hoverbikes.
This engine comes standard on Phoenix Hovercars. It is a very capable engine which should be used up until the usefulness of Hoverbikes becomes useless. If there is a shortage of SD Sport engines for purchase, then buy up the Phoenix Hovercar and rip out the engine. Sell the Hovercar afterwards.
The size of this engine is 2x2. It is in the small category.
This engine can power a Hawk Air Warrior (the largest terran airborne vehicle), but at reasonable acceleration.