From Aero Digest, April, 1935
Granville, Miller & de Lackner, Springfield, Massachusetts
• Howell W. Miller and Donald deLackner, operating in partnership. Chief Pilot: Lee Gehlbach.
Two-place open low-wing monoplane. P. & W. Hornet engine, 675 horsepower.
Span 34 feet 3 inches. Length overall 27 feet 3 inches. Height overall 9 feet 3 inches. Wing area 211 square feet. Power loading 10.4 pounds per horsepower. Wing loading 33.2 pounds per square foot.
Empty weight 3812 pounds. Useful load 3188 pounds. Gross weight 7000 pounds. Fuel capacity 400 gallons. Oil capacity 20 gallons.
Maximum speed at 6000 feet 240 miles per hour. Cruising speed at 6000 feet 200 miles per hour. Landing speed 69 miles per hour. Service ceiling 25,000 feet. Rate of climb 2050 feet per minute. Cruising range 2000 miles.
Fuselage: fabric and aluminum covered; welded chrome molybdenum steel tubing, truss type; tandem seating arrangement with coupe sliding top for each cockpit; detachable engine mount; fuel tanks are slung in the fuselage by padded dural straps. Wing: spars solid spruce; ribs plywood web; plywood covering finished with fabric doped to surface; internally controlled ailerons; double stainless steel streamline braced wires to fuselage; internally controlled double hinged flaps with irreversable self locking control. Tail group: cantilever horizontal and vertical surfaces, skin stressed type, plywood construction; dynamically balanced elevators. Fixed divided-type landing gear equipped with streamline tires, Bendix wheels and brakes, Bendix shock absorbers. Fafnir bearings for plane controls.
Standard equipment includes landing lights, navigation lights, two-way radio, Exide battery, Hamilton Standard controllable-pitch propeller, generator, inertia starter, oxygen equipment, landing and signal flares.
Instruments: Sperry gyro-horizon, turn and bank indicator, sensitive altimeter, air speed indicator, manifold pressure gauge, tachometer, thermocouple, fuel pressure, air temperature and pressure gauges. Also see data in October, 1934, AERO DIGEST.