Thomas Starr King Middle School - Echoes Yearbook (Los Angeles, CA)

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few seconds, it is true, those 'being filled with anguished anxiety, and wrought with danger, but it flew! Twenty years later! In twenty years youthful science has developed in the subject of aviation with astounding rapidity, and today aviation has be- come an industry. Flights of hours and hours, oceans spanned by glorious flights, and the earth spanned innumerable times. Perhaps the most important item in connection with the airplane--in fact, the heart-is the power plant. The comparative efficiency of the modern power plant 1ieS in the perfected four-cycle explosion motor, using gasoline as fuel. Of this type of engine We have two types-the water-cooled and air-cooled. Of the two, however, the general trend of usage is toward the latter. VVhy? This is explained by the elimination of the water-cooling system-fre- quently a source of motor trouble in water-cooled motors-which saves the necessity of having bulky cowlings, resulting in the increase of the all-around performance of the plane. It may cause some wonder as to the reasons that cause the army to maintain the usage of water-cooled motors. One is this: Water-cooled motors have the ability to stand a greater amount of rough usage. This usage may consist of high altitude or hedge-hopping, but it is a terrible strain on the motor. Another reason is that more power can be built into a water-cooled engine without disturbing the streamline structure of the plane. The air- cooled power plant is more adapted to a steady climate, since it depends on the temperature of the air for cooling. Frederic Singer, A 9. Model Builders Seventy-nine