Whether equipped with floats as a seaplane or with a landing gear, the Standard twin- motored seaplane is of a size that is commonly termed a battle plane. It has a total weight of 2 1/2 tons fully loaded and, at an economical speed, has a cruising range of 450 miles. The fuel tanks, carried in the body, have a capacity of 154 gallons, which at the maximum speed of 80 m.p.h. gives the machine an endurance of slightly over 2 ½ hours at full speed. The landing speed is 45 m.p.h.
Top Speed: 80 m.p.h.
Engine: two 140 h.p. Hall-Scott inlines
Wingspan: 69 feet, 2 inches
Weight: 5,000 pounds
Specifications from “Practical Aviation,” by Charles Hayward, 1919
Planes
The span of the upper plane is 69 feet 2 inches and that of the lower 54 feet 1 inch, the chord of both planes and the gap all being 7 feet. The machine measures 33 feet 4 inches over all and stands 12 feet 5 inches high. The supporting surface of the main planes is 816 square feet, this including the ailerons, which are 16 feet long and have an area of 43 square feet each. They are used on the upper plane only. The wing curve of the upper plane is the R.A.K. No. 6 (Royal Aircraft Factory, Great Britain), while that of the lower is one of the new American standard curves, known as the U.S.A. No. 2.
The upper plane is built in five sections, the central section measuring 15 feet, each main section, 15 feet 6 inches, awA. overhanging sections, each 11 feet 6 inches. A. gap CÄ \\\ allowed between the sections. The lower wings are built in four sections, the inner sections projecting 6 feet from the fuselage und the outer sections each measuring 20 feet, the fuselage being 32 inches wide at the point of attachment of the lower planes.
The area of the upper wings, including the ailerons, is 467 square feet and that of the lower, 349 square feet. The planes are set at an angle of incidence of 5 degrees and a dihedral of ‘.Ì degrees, while the tips are raked at an angle of 10 degrees, but there is no sweep back nor stagger. Tubular steel struts arc used on either side of the twin motors, forming a continuation of the tubular structure supporting the machine on its Moats, while two pairs of interplane struts of streamlined spruce are used on cither side of these, with tubular braces miming from the sockets of the outboard interplane struts to the overhanging panels.
Tail Unit
The horizontal stabilizer is approximately rectangular in plan and lias an area of 6l’ square feet, while the elevator has an area of x square feet. Two rudders are employed and are completely surrounded by the elevator, in which openings are cut to allow for the movement of the rudders. The vertical stabilizing surface is built in four sections, two above and two below the horizontal stabilizer, and has a total area of Hi square feet.
Fuselage
The over-all length is 33 feet 4 inches, the body having a maximum width of 32 inches and a maximum height of 3 feet, the nose extending 7 feet 4 inches forward of the centers of the front wing struts. The observer’s seat is thus brought well forward of the planes in a location to give an all around range of vision, while the pilot’s cockpit is just below the trailing edge of the upper plane, a portion of the latter being cut away at this point to permit a clear view upward as well ¡is to facilitate access to the scat. Two pairs of inverted V steel tube struts support the upper plane above the body and to the apex of this construction a sling is attached for hoisting the machine aboard a man-of-war. This sling is shown in the extended position, as in hoisting, Fig. 31. The control is of the single Deperdussin type, though dual control may be fitted.
Power Plant
The Standard machine is driven by two Hall-Scott six-cylinder vertical water-cooled engines, rated at 140 h.p. each at 1350 r.p.m. Each of these motors weighs 605 pounds a consumes 30 gallons of gasoline per hour. Five gallons of oil ai carried in the crankcase of each motor. The propellers measure 8 feet 6 inches in diameter and are driven direct. Viewed from the pilot’s seat, the left-hand propeller rotates in a clockwise direction and the right-hand, in an anti-clockwise direction. Each motor unit is independent, a vertical radiator extending upward through the upper plane being mounted directly over the motor, and either one of the motors is capable of propelling the machine alone.
Floats
The twin floats are 3 feet wide, 10 feet 4 inches long, and 2 feet in depth, and they are centered 12 feet apart, beins attached to the body by steel supports with a streamline fairing of spruce. A step is placed 5 feet from the after end of each float. A tail float is attached to the under side of the after extremity of the fuselage.