Suchergebnisse

Design of the wing planform depended on some geometry key factors such as aspect ratio, sweep angle, taper ratio, and angle of incidence. The search for optimum fl ight characteristic could be observed from aerody-namic coeffi cients, fl ight stability, fl ight dynamic, fl ight performance, and fl ight quality. To examine the design of the wing planform, this paper presented an experiment that modify few factors of wing geometry and simulated it concerning the launching phase of the unmanned air-vehicle or UAV using rocket as booster. The optimal design of the wing is a prerequisite for the UAV to achieve its main mission as a national defense missile. Using X-Plane v 8.6 as a fl ight simulation tool, the experimental results showed that a hybrid wing could produce an intermediate grade fl ight characteristic between rectangular wing and delta wing. Rectangular wing tended to produce a highly pitch-up trajectory when catapulted by a rocket booster, while delta wing produced a more stable pitch attitude and more better fl ight performance. This experiment showed that hybrid wing was the appropriate choice for subsonic jet UAV that had to be launched by rocket.

Defense and security are serious business, as they represent the integrity and dignity of a nation. It is understandable to assess military power and facilities as crucial to a nation's defense, shown in the use of fighter airplanes. A fighter airplane serves as a window to represent nation's values, philosophy and ideology; appeared through its design form and defense ability. The presented paper explores and compares 2 (two) types of fighter airplane, F-16 of US and SU-27 of Russia, in order to observe and characterize their design forms. Having acknowledged the characteristic of their design forms as tangible aspect of analysis, it is identified that this characteristic can be split into form design and numerical design. Comparative assessment of both fighter airplanes indicates that F-16 fighter airplane of US appears smaller than the SU-27 of Russia. The smaller size of F-16 form was meant to have superior maneuver-ability for air-to-air combat, while the size of SU-27 was meant to accommodate multi-tasking aspects of fighter airplane (air-to-air combat and interceptive act). As results, both airplane forms express different views and ideological perspectives. The F-16 of US shows great and superior ability to carry special task of becoming combat airplane (thrive to perfection), coming with a hefty price and catered for great quality. On the other hand, SU-27 of Russia shows a wider purpose and not necessarily has superior ability in order to carry diverse tasks of an airplane (multi-tasking), coming with a cheaper price and catered in a great quantity. Thus, it can be deduced that the American designer of fighter airplane tends to acknowledge specialization of military purpose compare to the Russian's generalization of military purpose.