![]() Twin booms have also been adopted for twin-engined designs where the engine system includes bulky additional items such as turbochargers and heat exchangers, taking up a large volume of space. The Scaled Composites SpaceShipOne and SpaceShipTwo sub-orbital spaceplanes adopted twin booms with outboard tails or outboard horizontal stabilizers (OHS) to keep the airframe clear of the more widely-spreading rocket engine exhaust. In these designs, the tailplane (horizontal stabilizer) is typically high-mounted on twin tail fins to keep it clear of the engine wake. The Saab 21 was originally built as a pusher type and was later adapted to jet power as the 21R. The twin-boom configuration allows a much shorter and more efficient installation. It has been adopted to resolve various design problems with the conventional empennage for aircraft in different roles.įor a single engine with a propeller in the pusher configuration or a jet engine, a conventional tail requires the propeller or exhaust to be moved far aft, requiring either a very long driveshaft or jet pipe and thus reducing propulsive efficiency. The twin-boom configuration is distinct from the twin fuselage type in having a separate, short fuselage housing the pilot and payload. ![]()
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