The principal dimensions and specifications of the S-7 are: Span, both planes 32′ 0″ Over-all length 21′ 6″ THE UNITED AIRCRAFT ENGINEERING CORPORATION This company is showing a Canadian-Curtiss training-plane, such as used by the Royal Flying Corps for instruction in Canada and England. A number of Curtiss OX-5 100 horse-power engines are also on display, together with other equipment, which the company has purchased from the Imperial Munitions Board of Canada. UNITED STATES ARMY _Langley Experimental Flying-Machine_ The model of the Langley aeroplane is a copy of the original Langley Flying-Machine which is now in the United States National Museum at Washington, D. C. This machine made the first successful flight by heavier-than-air machine driven by its own power. The machine was launched May 6, 1896, at Quantico, Va. It rose to a height of 70 to 100 feet, and travelled half a mile at 20 to 25 M. P. H., with propellers revolving at 1,500 R. P. M. The total weight of the machine is 26 pounds. It is driven by a single-cylinder engine, using gasoline as fuel. _Foreign Aeroplanes_ Among the foreign aeroplanes sent to the aero show by the War Department are the French Spad, French Nieuport, British SEV, and a German Albatross D11. The Spad is a single-seater scout, with a Hispano-Suiza engine. The Nieuport Single-Seater is equipped with a rotary Gnome engine. The SEV, which was put into limited production in the United States, has a Hispano-Suiza engine. The Albatross Scout was one of Germany’s best fighters. It has a Mercedes engine. UNITED STATES NAVY DEPARTMENT The F-5-L constructed by the Naval Aircraft Factory at Philadelphia has a span of 107 feet wing, chord of 8 feet, and an over-all length of 50 feet. Two 400 horse-power Liberty engines are used, connected to tractor propellers 10 feet 6 inches in diameter. Five hundred gallons of gasoline are carried, sufficient for a duration of 10 hours at full speed, near sea-level, and a speed of 102 M. P. H. is maintained. Fully loaded the machine weighs 14,000 pounds. This weight included a crew of 5 men, 1 Davis and 4 Lewis machine-guns, 4,230 pounds bombs, radio apparatus, telephone system with 6 stations, carrier-pigeons, and 500 gallons of gasoline. The machine is exhibited with one half covered and the other half exposed to show the interior construction. In the making of this machine there are 6,000 distinct pieces of wood, 50,000 wood screws, 46,000 nails, braces, and tacks, and 4,500 square feet of cotton fabric. The hull requires 600 square feet of veneer. The 250 pieces of steel tubing total 1,000 feet in length; 5,000 feet of wire and cable, 500 turnbuckles, 1,500 each of bolts, nuts, and washers, and 1,000 metal fittings are necessary in the construction of this flying-boat. _Navy M-2 Baby Seaplane_