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fuel tank which can be placed in the front cockpit instead of a passenger without affecting the plane’s total weight or balance. This tank can be installed or removed quickly, and when used allows more baggage space. For use with this installation, a removable cockpit cover which hinges open for baggage is avail-able.

The installation of the additional fuel tank increases range from 400 to 650 miles.

Engine cowling, fillets, fairing, pants, and almost every part formerly made of aluminum are now made of 17-ST and 24-ST Alcald, giving stronger and more durable parts. Among other improvements in the new series is an improved engine baffling which has lowered cylinder head and oil temperatures. A new fuel tank construction incorporates twice the normal number of baffles, reducing surging and increasing strength and durability, and an improvement in the fuel gauge increases floatation and eliminates any tendency to stick or bind.

Performance is enhanced by the use of a new propeller design. The propeller on the S-T, and S-T-A has a diameter of 77 in., while an SO-in. diameter propeller is used on the S-T-A Special. Propeller clearance level is 23.75 and 22.25 ins. respectively, and the ground angle is12 degree 3 8 minutes . The Ryan fuselage has thick gauge Al-clad skin which eliminates internal stiffeners and provides strong and durable construction and aerodynamically clean lines. It is elliptical in cross-section, giving good visibility from either cockpit.

Pilot and passenger cockpits are equipped with metal seats designed for seat type parachutes or Kapok-filled cushions. Seat backs are upholstered and pilot’s cockpit is now longer and equipped with a form fitting seat back. Upholstering is red leatherette. A 40-lb. baggage compartment equipped with a Sesame combination lock, and of 2.5 cu. ft. capacity, is located between the cockpits, almost over the center of gravity, with the back of the front seat hinging forward as door.

Dual controls are standard with front cockpit controls quickly removable. A torque tube mounted in aluminum alloy bearings connects the two sticks for aileron control and a push-pull tube in-side the torque tube provides the elevator connection. Brake pedals, heel operated, are mounted on both sets of rudder pedals.

Aluminum alloy ribs, steel compression members and spruce spars with fabric covering are used in the Ryan wing which is an NACA 2412 section with a 3degree incidence, and a 4degree 30 minute dihedral.

The nose of the wing is covered with 17-ST aluminum alloy carried well back of the front spar, giving a true contour of the airfoil, and fittings are oversized and designed to eliminate eccentricities. Either front or rear spar may be replaced without damage to any rib or fitting.

Aileron construction incorporates a steel tube spar with aluminum alloy ribs, and ailerons are balanced by locating the hinges behind the leading edge, which is covered with 17-ST alloy. Differential action is utilized and ailerons are actuated by a short push-pull tube with ball-bearing connections to a bell crank with flexible cable to control stick arm. No pulleys are used.

Flaps are constructed similarly to the aileron with heavier members throughout. They lower to a 30degree angle and are effective in braking action and in increasing lift at low speed. Bracing is by stream-lined tie rods and double flying wires and single landing wires are used.

Tail surfaces are built up from aluminum alloy tubes and stamped ribs, covered with fabric. Large hinges are employed with removable bronze bushings. Trimming tabs on both elevators provide for longitudinal balance. and Wing flaps or air brakes can be lowered about 30 degrees.

Tabs on elevators eliminate stabilizer adjustment control may be operated from either cockpit. Any desired adjustment setting is obtainable.

Landing gear is the treadle type with 18 X 8 X 3 airwheels, mechanical brakes (operated from either cockpit), and long stroke oleo shock absorbers. As illustrated on the front cover of this issue, complete fairing, which may be readily removed for inspection or adjustment, is provided.

Moving parts incorporate large bronze bearings that are replaceable, and the oleo cylinder is designed to eliminate possibility of oil leakage. An 8 in. streamlined pneumatic full swiveling tail wheel is mounted on a trombone type rubber shock absorber. Large bearing blocks are bolted to the fuselage and are replaceable.

The welded steel tube engine mount is bolted to the fuselage and may be easily removed. Rubber mountings are used on the engine and a stainless steel firewall separates the engine compartment from the fuselage.

Specifications and Performance Wing span . . . . . . . . . .  .29 feet 11 inches Length overall . . . . . . . . .21 feet 8 inches Height overall . . . . . . . . . 6 feet 11 inches Wing area . . . . . . . . . . . . 124 square feet Wing loading . . . . . . . . . . 12.7 lbs./sq. ft. Empty weight . . . . . . . . . .1027 pounds Useful load . . . . . . . . . . . .539 pounds Gross weight (max.) . . . .  .1575 pounds