Spartan C4
Role	Four-seat cabin monoplane Type of aircraft
National origin	United States
Manufacturer	Spartan Aircraft Company
First flight	1930
Number built	7
Developed into	Spartan C5

The Spartan C4 was an American four-seat cabin monoplane designed and built by the Spartan Aircraft Company.^[1]

Design and development

The first model was the C4-225 a high-wing braced monoplane powered by a 225 hp (168 kW) Wright J-6 radial engine.^[1] Only five C4-235 aircraft were built and they were followed by one C4-300 with a 300 hp (220 kW) Wright R-975 radial engine, and the C4-301 with a 300 hp (220 kW) Pratt & Whitney Wasp Junior.^[1]

Variants

C4-225

Production aircraft powered by a 225 hp (168 kW) Wright J-6 radial engine, five built.^[1]

C4-300

Variant with a 300 hp (220 kW) Wright R-975 radial engine, one built.^[1]

C4-301

Variant with a 300 hp (220 kW) Pratt & Whitney Wasp Junior radial engine, one built.^[1]

Specifications (C4-225)

Data from Jane's all the World's Aircraft 1931^[2]

General characteristics

• Crew: One or Two
• Capacity: 2 or 3 passengers, (four seats total)
• Length: 50 ft (15 m)
• Wingspan: 32 ft 3.75 in (9.8489 m)
• Height: 9 ft (2.7 m)
• Wing area: 299 sq ft (27.8 m²)
• Empty weight: 2,325 lb (1,055 kg)
• Gross weight: 3,515 lb (1,594 kg)
• Fuel capacity: 85 US gal (320 L; 71 imp gal) in two wing tanks;
  
• Oil capacity: 6 US gal (23 L; 5.0 imp gal)
• Powerplant: 1 × Wright J-6 9-cylinder air-cooled radial piston engine, 240 hp (180 kW)
• Propellers: 2-bladed fixed pitch steel propeller

Performance

• Maximum speed: 129.7 mph (208.7 km/h, 112.7 kn)
• Cruise speed: 109 mph (175 km/h, 95 kn)
  
• Landing speed: 51 mph (82 km/h)
• Service ceiling: 15,000 ft (4,600 m) service
• Rate of climb: 905 ft/min (4.60 m/s) initial
• Wing loading: 11.7 lb/sq ft (57 kg/m²)
• Power/mass: 14.65 lb/hp (8.91 kg/kW)