Douglas DC 7

When Lockheed developed the L1049 Super Constellation, TWA enjoyed an advantage over other airlines, since the plane had non-stop transcontinental range, and was faster than the DC-6 (TWA marketing people didn't think people would sit still for a non-stop trip, however, and insisted on a stop until American announced upcoming non-stop service with their new DC-7's!). To counter this threat from the Super Conny, American requested that Douglas develop a plane with the L1049's engines (Wright R-3350's). Douglas was doubtful that a plane like that would sell, so American ordered 25 for $40 million, to provide an incentive. American ended up owning 34 DC-7's, and sales were made exclusively to domestic US operators which used them on transcontinental routes, since the DC-7 didn't have the range for trans-ocean non-stops and thus would not be much improvement over the DC-6B. However, they were very successful in transcontinental service, since they were faster than the Super Constellations, and allowed American to advertise 8 hour non-stop service.

D4E-535466 DC-7 (Douglas 1953)

Sales eventually totalled 105, with the owners being United (57), American (34), Delta (10), and National (4). However, Douglas went on to modify the DC-7 (with more fuel) to the DC-7B, and (with a lengthened fuselage and wings) to the DC-7C Seven Seas, and eventually sold a total of 338 of the DC-7 series, at a substantial profit. The DC-7's proved to be less reliable than the fabled DC-6B, and less economical as well. Thus, the DC-7's had a short stay in service with the major airlines, and were sold soon after the arrival of the jets. They worked for many years for 2nd tier airlines and as freighters or fire bombers, but most have been scrapped - suffering in comparison to arguably the best propliner ever, the DC-6B.

Description

Role Civil air transport
Crew 3 or 4
Passengers 99 to 105
First Flight 1953
Entered Service  
Manufacturer Douglas Aircraft Company Long Beach, California

Dimensions

Length 112 ft 3 in 37 m
Wingspan 127 ft 6 in 42 m
Height 31 ft 10 in 10.5 m
Wing area 1,637 ft 152 m

Weights

Empty 72,763 lb 33,005 kg
Loaded lb kg
Maximum takeoff 143,000 lb 65,000 kg
Capacity  

Powerplant

Engines Four Wright R-3350 radial piston engines
Power 13,600 hp 10,140 kW

Performance

Cruising speed 355 mph 570 km/h
Maximum speed 406 mph 650 km/h
Range (DC-7A) 4,605 miles 7,410 km
Range (DC-7C) 5,635 miles 9,070 km
Ferry range miles km
Service ceiling 25,000 ft 7,600 m
Rate of climb 1,043 ft/min 318 m/min
Wing loading 87.4 lb/ft 427.6 kg/m
Power/Mass 0.10 hp/lb 160 W/kg