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Why Are Airplanes Riveted Instead Of Welded?

Anyone who is interested in aviation has noticed that most commercially produced aircraft have a very similar architecture. Although powered flight has been through many extraordinary changes in the past century, many of the basic structural characteristics remain...

Why Is 29.92 The Standard Altimeter Setting?

Standard pressure is 1013.25 hectopascals (hPa) which is equivalent to 29.92 inches of mercury (Hg). This setting is equivalent to the atmospheric pressure at mean sea level (MSL). Pressure altitude is primarily used in aircraft-performance calculations and in...