موضوعات
آموزش و پرورش
ادبیات و زبان
پزشکی، دندانپزشکی و داروسازی
تاریخ و جغرافیا
داستان و رمان
دیگر
دین و فلسفه
روانشناسی
ریاضیات و آمار
سلامتی، تناسب اندام و رژیم غذایی
شیمی و پلیمر
علوم اجتماعی و حقوق
علوم زیستی و بیوتکنولوژی
فیزیک و نجوم
کامپیوتر و اینترنت
کتابهای کودکان و داستان
کسب و کار و اقتصاد
کشاورزی و دامپزشکی و غذا
معماری
مهندسی و فناوری
هنر و تئاتر
محصولات
Facts about flying wings. A primer on all-wing aircraft - PDF
نویسندگان: خلاصه: For many years airplane designers have realized that by reducing parasite drag. that drag caused by the shape or form of the aireraft, its performance could be greatly inereased. Early steps in this direction were the changes from biplane to monoplane designs, the elimination of external struts and wires, the incorporation of retractable landing gears, ete. In spite of all these advaneements, the average conventional airplane of today has two to four times the drag that would be necessary if all its functions could be incorporated within its wing alone.
The radar game: Understanding stealth and aircraft survivability - Original PDF
نویسندگان: خلاصه: Precision weapons and rapid targeting information mean little if aircraft are unable to survive engagements with enemy air defenses. In addition to costing the lives of pilots, high levels of attrition can ultimately affect the outcome of the theater campaign. One of the most critical factors in determining the success of an air operation is survivability. In the last several decades, the term survivability has been associated with analysis of how low observables and electronic countermeasures can help aircraft carry out their missions in hostile airspace. Discussions of survivability immediately bring to mind stealth aircraft, radar jamming and debates about the latest SA-10 threats. Yet the quest for survivability is not a fad of the Cold War or the high-technology 1990s. Its roots, and its importance to combined arms operations, go back to the first use of military aircraft in World War I.
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