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In February, 1911, a 4-cylinder Elbridge engine was installed in Martin's exhibition plane for added power. By June, Day and Beall had a new plane ready, with an 8-cylinder, Vee-type 60 h.p. Hall-Scott engine, which Martin started using at once. The business began to grow, more people were added to the force, and by fall their shop proved to be too small so the business was moved to a larger building near Griffith Park in Los Angeles.

  In the spring of 1912 Day designed a float with which Martin began flying from the water and Martin decided to attempt a flight to Catalina Island and return a 75 h.p. Curtiss engine was installed in this plane. Day helped in all the preparations for the flight, which Martin made successfully on May 12th.

  Shortly after this Day left Martin to start his own company in Los Angeles. He helped Floyd Smith build a plane, then started to design a new and novel flight fuselage-type tractor biplane of 30 foot span, using a 4-cylinder, 40 h.p. Hall-Scott engine driving a large propeller at half-engine-speed by chain transmission. This single-place plane, called the "Day Tractor," had an unusually fine performance from the start and astounded everyone with its short takeoff, climb, and all-around good flying characteristics. 

   Day took this airplane to Cicero Field at Chicago, Illinois, in September, 1912, where Max Lillie and DeLloyd Thompson were so elated with its performance that Lillie took the midwestern agency for it, bought the machine, and started using it in his business. It was advertised and described in October. At Cicero, Thompson found he could carry a passenger with ease and Day rode with Thompson there on numerous flights.  At that time Day's shop in Los Angeles was busy working on three machines, a new Curtiss-type special hydro with an 80 h.p. Curtiss engine for Horace Kearney, and two additional Day Tractors, one with 40 h.p. and one with 60 h.p. Hall-Scott engines. Day was back in Los Angeles in November where he was kept busy with shop operations.