A number of model aeroplane builders in America have developed distinctive designs which have come to be accepted as standard types. Among thousands of boy amateurs these models are looked upon much as, in the larger field of aeronautics, the Wrights, Curtiss, or Bleriot are accepted as authoritative. Like the famous designers and pilots of man-carrying craft this younger generation of designers give their names to their machines. Our young designers, as a rule, confine themselves to developing a particular type of machine. A comparison of the models of the same builder for a year or more will usually show that the same general form and arrangement of the planes remain the same. The Percy Pierce model, which borrows the name of its designer, is probably the best known of these model aeroplanes. The designer is a New York schoolboy seventeen years of age, who has won distance records both for indoor and outdoor flying. His machines rise from the ground under their own power. The Pierce model of 1911 is equipped with wings much narrower than those used last year, spaced well apart on a four-foot frame. The planes, which are slightly flexed, are covered with silk, or bamboo paper drawn taut and varnished. Twin propellers of high pitch are used and the motors are carried above the planes. They are wound more than five hundred times. The planes are carried beneath the main frame. Directional stability is obtained by carrying back the edges of the rear plane and by a vertical rudder placed beneath. The model is mounted on skids of bent reed and is elevated very slightly above the horizontal. It starts off very fast, often leaving the ground within five feet. The model reaches its maximum altitude, traveling at an angle equivalent to its position at starting, and maintains its height throughout its flights. The later Pierce machines, while preserving the same general lines, are considerably lighter and have developed surprising distance qualities. The planes are made of light lath or bamboo covered with specially prepared paper, while the pitch of the propellers has been increased as has the power. The latest models have flown for 1,600 feet. Another prize-winning model which has attracted considerable attention of late is the aeroplane designed and built by Cecil Peoli. It shows an intelligent appreciation of the principles involved and excellent workmanship. It is a monoplane, flying with the smaller plane forward, and has recently flown for nearly 1700 feet. Planes are used with both silk or paper covering. The success of the model is largely due, no doubt, to the careful workmanship and finish of the planes.