SD Deluxe (Apocalypse)
A more high-powered version of the Superdynamics standard, but still small enough for a Hoverbike.
Source: X-COM Apocalypse Ufopedia
A performance-level engine sold by Superdynamics that is suited to very small airborne vehicles only. It does not come as standard on any vehicle.
The power of this engine is upgraded over the SD Standard, but it is only useful if one cannot source enough of the better SD Sports engines. Its use should be restricted to the Hoverbike, as it is under powered for larger vehicles.