Boeing 307
Technical Specifications

First Flight: December 31, 1938
Number Built: 10 for commercial service
Length: 74 feet  4 inches
Wing Span: 107 feet 3 inches
Height: N/A
Cabin Width: 12 Feet
Max Take-Off Wt.: 45,000 lbs. 
Max Landing Wt.: N/A
Empty Wt.: N/A
Max Cruising Speed: 246 mph   214 kts
Normal Cruising Speed: 220 mph   191 kts
Stall Speed: N/A
Service Ceiling: 26,200 feet
Fuel Capacity: 1700 gallons
Oil Capacity: 25 gallons per engine
Range: 2390 miles 
Fuel Type: 100/130 octane
Fuel Consumption: 39 GPH per engine
156 GPH total
Engines: 4 Wright Cyclone GR-1820-102A engines rated @ 1100 HP each
Seating: 33 Passengers 
Crew: 2 Pilots 
1 Flight Enginner
1 Radio Operator
1 Flight Attendent

Engine Specifications

 Wright Cyclone GR-1820

Type: 9 cylinder air cooled radial
3.2 reduction gearing
Length: 47.69 inches
Diameter: N/A
Bore: 6.125 inches
Stroke: 6.875 inches
Displacement: 1820 cubic inches
Compression Ratio: 6.8 to 1
Dry Weight: 1365 lbs.
Ignition: Dual Scintilla S9LU-5
Fuel Grade: 100/130 octane
Carburation: Stromberg PD12K14
Blower Ratio: 7.0 to 1 single stage
Performance: Rated @ 1100 HP each
Take-Off Power: 43.5" HG @ 2300 rpm (1 minute)