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The book American Secret Projects: US Airlifters Since 1962 describes on pages 36-38 two Boeing LFC design studies, the Model 741-6 and Model 748B-28A. Specifications for both proposals are as follows:Boeing Model 741-6Powerplant: four Pratt & Whitney J57 turbojets (13,750 lb thrust each)Length: 128 feet 10 inWingspan: 134 feet 5.5 inHeight: 38 feet 4 inMax TOW: 297,000 lbMax payload: 82,000 lbRange: 5,400 nm with 80,000 lb payload; 6,600 nm with 40,000 lb payload; 7,300 nm with 20,000 lbBoeing Model 748B-28APowerplant: four Pratt & Whitney JT3D turbofans (23,000 lb thrust each)Length: 187 feetWingspan: 206 feetHeight: 55 feetMax TOW: 438,000 lbCargo bay: 100 feet long x 16 feet wide x 14 feet high
The book American Secret Projects: US Airlifters Since 1962 describes on pages 36-38 two Boeing LFC design studies, the Model 741-6 and Model 748B-28A. Specifications for both proposals are as follows:
Boeing Model 741-6
Powerplant: four Pratt & Whitney J57 turbojets (13,750 lb thrust each)
Length: 128 feet 10 in
Wingspan: 134 feet 5.5 in
Height: 38 feet 4 in
Max TOW: 297,000 lb
Max payload: 82,000 lb
Range: 5,400 nm with 80,000 lb payload; 6,600 nm with 40,000 lb payload; 7,300 nm with 20,000 lb
Boeing Model 748B-28A
Powerplant: four Pratt & Whitney JT3D turbofans (23,000 lb thrust each)
Length: 187 feet
Wingspan: 206 feet
Height: 55 feet
Max TOW: 438,000 lb
Cargo bay: 100 feet long x 16 feet wide x 14 feet high
