Glider airframes are designed with a fuselage, wings,  and empennage or tail section. Self-launching gliders are  equipped with an engine that enables them to launch without  assistance and return to an airport under engine power if  soaring conditions deteriorate. The fuselage is the portion of the airframe to which the  wings and empennage are attached. The fuselage houses  the cockpit and contains the controls for the glider, as well  as a seat for each occupant. Glider fuselages can be formed  from wood, fabric over steel tubing, aluminum, fiberglass,  Kevlar ® or other composites, or a combination of these  materials.  [Figure 2-7] Glider wings incorporate several components that help the  pilot maintain the attitude of the glider and control lift and  drag. These include ailerons and lift and drag devices, such  as spoilers, dive brakes, and flaps. Glider wings vary in size  and span from 12.2 meters (40 feet) to 30 meter (101.38 feet).  Wings and Components The Fuselage 7.  World class—the FAI Gliding Commission, which  is part of the FAI and an associated body called  Organization Scientifique et Technique du Vol à Voile  (OSTIV), announced a competition in 1989 for a low- cost glider that had moderate performance, was easy  to assemble and handle, and was safe for low-hours  pilots to fly. The winning design was announced in  1993 as the Warsaw Polytechnic PW-5. This allows  competitions to be run with only one type of glider.  Figure 2-5.  The Schempp-Hirth Nimbus-4 is a family of high- performance Fédération Aéronautique Internationale (FAI) open  class gliders. Figure 2-6.  The DG Flugzeugbau DG-1000 of the two-seater class. Figure 2-7.  Components of a glider. 2-4 Right aileron Left aileron Spoiler/Dive brake Empennage Fuselage Landing gear Left wing Right wing Cockpit