Lockheed Model 18 Lodestar
|Model 18 Lodestar
C-56 / C-57 / C-60 / R5O
|National origin||United States|
|First flight||September 21, 1939|
|Introduction||March 30, 1940|
|Primary user||United States Army Air Corps|
|Developed from||Lockheed Model 14 Super Electra|
The Lockheed Model 18 Lodestar was a passenger transport aircraft of the World War II era.
Design and development 
Sales of the 10–14 passenger Lockheed Model 14 Super Electra, which first flew in 1937, had proved disappointing, despite the aircraft's excellent performance, as it was more expensive to operate than the larger Douglas DC-3, already in widespread use. In order to improve the type's economics, Lockheed decided to stretch the aircraft's fuselage by 5 feet 6 inches (1.68 m), allowing an extra two rows of seats to be fitted.
The prototype for the revised airliner, designed Model 18 by Lockheed, was converted from the fourth Model 14, one of a batch which had been returned to the manufacturer by Northwest Airlines after a series of crashes. The modified aircraft first flew in this form on September 21, 1939, with another two prototypes being converted from Model 14s, and the first Model 18 built from new flying on February 2, 1940.
A total of 625 Lodestars of all variants were built.
Operational history 
The Lodestar received its Type certificate on March 30, 1940, allowing it to enter service with the first customer, Mid-Continent Airlines that month. As hoped, the extra seats greatly improved the Model 18's economics, reducing its seat-mile costs to a similar level to that of the DC-3, while retaining superior performance. Despite this, sales to US domestic customers were relatively slow as most US airlines were already committed to the DC-3, with only 31 Lodestars going to US airlines. Overseas sales were a little better, with 29 bought by the government of the Netherlands East Indies. South African Airways (21), New Zealand National Airways Corporation (13), Trans-Canada Air Lines (12) and BOAC (9) were the biggest airline customers. Various Pratt & Whitney and Wright Cyclone powerplants were installed.
When the United States started to build up its military air strength in 1940–41, many American operated Lodestars were impressed as the C-56. This was followed by the construction of many new-build Lodestars which were flown by the Army Air Force as the C-60 and U.S. Navy as the R5O. Lend-lease aircraft were used by the RNZAF as transports.
One bought in 1942 to serve as Brazilian President Getúlio Vargas' personal aircraft. This aircraft was specially designed for that purpose and had 11 seats.
After the war many Lodestars were overhauled and returned to civilian service, mostly as executive transports such as Dallas Aero Service's DAS Dalaero conversion, Bill Lear's Learstar (produced by PacAero), and Howard Aero's Howard 250. A few of the latter were even converted to tricycle undercarriage.
A number of skydiving operations in the United States used Lodestars during the 1970s and 1980s.
Around 10-15 are still airworthy in the USA alone. An example of a Lodestar converted for commercial use exists at the 1940 Air Terminal Museum in Houston, Texas. A lodestar Cn2026 ZS-ASN of South African Airways is preserved and on display at the South African Airways Museum Rand Airport Johannesburg, South Africa.
- New Zealand:
- Lockheed Lodestar c/n 2020. 1939 United Airlines, USAAF 1941 BOAC, Spanish Airforce, US civil market as 1954 N9933F, converted for Agricultural topdressing, registered to Fieldair 1957. to Museum of Transport and Technology 1970.
- Lockheed Lodestar c/n 2152. USAAF, RAF, Spanish Airforce,US civil market as N9930F 1955, Fieldair 1957 as ZK-BUV. Gate Guardian Gisborne from 1973. Removed 1998 and now with the Gisborne Aviation Society.
- Powered by two 875 hp Pratt & Whitney Hornet S1E2-G engines; 25 built plus two prototypes.
- Powered by two 1,200 hp Pratt & Whitney Twin Wasp S1C3-G engines; 33 built.
- Powered by two 1,200 hp Pratt & Whitney Twin Wasp S1C3-G engines; 39 built.
- Powered by two 1,200 hp Pratt & Whitney Twin Wasp S4C4-G engines; four built.
- Powered by two 1,200 hp Wright Cyclone G-1820-G104A engines; 26 built.
- Powered by two 1200hp Wright Cyclone G-1820-G202A engines; 13 built.
US Army Lodestars 
- Powered by 1,200 hp Wright 1820-89 engines, one Model 18-50 for evaluation.
- One impressed Model 18-07 with two Pratt & Whitney R-1690-54 engines.
- Thirteen impressed Model 18-40s with two Wright 1820-97 engines.
- Twelve impressed Model 18-07.
- Seven impressed Model 18-08.
- Two Model 18-40s impressed in 1943.
- As Model 18-14 powered by two 1,200 hp Pratt & Whitney R-1830-53 engines.
- Allocated for impressed aircraft, not used.
- Based on Model 18-08 fitted for trooping; seven aircraft built.
- Repowered C-60A with Pratt & Whitney R-1830-51 engines; three aircraft converted.
- Repowered C-57C with Pratt & Whitney R-1830-92 engines; one aircraft converted.
- Based on Model 18-07 powered by Pratt & Whitney R-1690-25 Hornet engines; 10 aircraft built, transferred to Royal Air Force as Lodestar IA.
- Model 18-56 powered by Wright R-1820-87 engines; 36 aircraft built, some transferred to RAF as Lodestar II.
- As the C-60 but fitted out as a paratroop transport powered by Pratt & Whitney R-1830 Twin Wasp engines; 325 aircraft built.
- One C-60A fitted with experimental de-icing equipment.
- Proposed 21-seat troop transport aircraft, never built.
- Powered by Wright R-1820-87 engines; one aircraft built, 11-passenger interior for transfer to the Brazilian Air Force.
- Original designation for C-60C
- One Model 18-07 acquired for evaluation powered by 1,200 hp (895 kW) Wright R-1820-40 engines.
- Staff transport powered by 1,200 hp (895 kW) Wright R-1820-97 engines; three aircraft built, two for the USN and one for the United States Coast Guard.
- Navy version of the C-59 powered by 850 hp (634 kW) Pratt & Whitney R-1690-25 engines; one aircraft built.
- Powered by 1,200 hp (895 kW) Pratt & Whitney R-1830-34A engines. Originally 4-seater VIP transports; three aircraft built.
- Powered by 1,200 hp (895 kW) Wright R-1820-40 engines. Impressed. 7-seater staff transports; 12 aircraft built.
- Navy version of the C-60 powered by 1,200 hp (895 kW) Wright R-1820-40 engines. Similar to the R5O-4 but had 14-seats; 38 aircraft built and three former NEIAF aircraft.
- Navy version of the C-60A for the US Marine Corps, equipped with 18 paratroop seats; 35 built.
Civil operators 
- Trans-Australia Airlines (TAA) (two, operated 1952–1953)
- SABENA (mainly in Africa)
- Lloyd Aéreo Boliviano (LAB)
- Linhas Aéreas Wright
- NAB – Navegação Aérea Brasileira
- Panair do Brasil (6 Model 18-10s delivered new)
- SAVAG (Sociedade Anônima Viação Aérea Gaúcha) (two Model 18-10s bought from Panair do Brasil)
- Transportes Aéreos Universal
- Viação Aérea Bahiana
- Trans-Canada Air Lines (12 Model 18-10s delivered new)
- Yukon Southern Air Transport (Two Model 18-10s delivered new)
- Canadian Pacific Air Lines (purchased Yukon Southern Air Transport in 1941)
- Air Afrique (the prewar airline, unrelated to the postwar airline of the same name) (Five Model 18-07s delivered new)
- Air France (Three Model 18-07s delivered new)
- Aero Africaine (part of Société Africaine des Transports Tropicaux (SATT), based in Algeria)
- South African Airways (21 Model 18-08s delivered new)
- Commercial Air Services operated two aircraft.
- Continental Air Lines (Five Model 18-08s delivered new)
- Mid-Continent Airlines (Four Model 18-07s delivered new)
- National Airlines (Three Model 18-50s delivered new)
- Pan American Airways (Alaska Division only) (Six Model 18-10s delivered new)
- United Air Lines (Four Model 18-10s delivered new)
- Inland Air Lines (One Model 18-08 delivered new)
- Western Air Lines (purchased Inland Air Lines in 1944 and operated it as a separate division)
- Alaska Star Airlines (renamed to Alaska Airlines in 1944) (one Model 18-56)
- Caribbean-Atlantic Airlines (in Puerto Rico and the U.S. Virgin Islands)
Military operators 
- Colombian Air Force (C-60 as VIP transport)
- United States Army Air Corps
- United States Navy
- United States Marine Corps
- United States Coast Guard
Accidents and incidents 
In 1949, a Lockheed Lodestar in airline service in Australia crashed immediately after takeoff. All 21 occupants died in the crash or the ensuing conflagration. The cause of the accident was determined to be that the center of gravity was behind the rear limit. It is also likely the elevator trim tab was set for landing rather than takeoff.
Specifications (C-60A-5) 
Data from Lockheed Aircraft since 1913
- Crew: 3
- Capacity: 18 passengers
- Length: 49 ft 10 in (15.19 m)
- Wingspan: 65 ft 6 in (19.96 m)
- Height: 11 ft 10 in (3.6 m)
- Wing area: 551 ft² (51.2 m²)
- Empty weight: 12,500 lb (5,670 kg)
- Loaded weight: 17,500 lb (7,938 kg)
- Max. takeoff weight: 21,000 lb (9,825 kg)
- Powerplant: 2 × Wright R-1820-87 nine-cylinder air-cooled radial engines, 1,200 hp (895 kW) each
- Maximum speed: 266 mph (231 knots, 428 km/h) at 17,150 ft (5,230 m)
- Cruise speed: 200 mph (174 knots, 322 km/h)
- Range: 2,500 mi (2,174 nmi, 4,025 km)
- Service ceiling: 25,400 ft (7,740 m)
- Climb to 10,000 ft (3,050 m): 6.6 minutes
See also 
- Related development
- Related lists
- List of aircraft of World War II
- List of airliners
- List of Lockheed aircraft
- List of military aircraft of the United States
- List of military aircraft of the United States (naval)
- List of Royal New Zealand Air Force Aircraft
- Francillon 1982, pp. 185–194, 488–489.
- Francillon 1982, p. 135.
- Francillon 1982, pp. 185–186.
- Francillon 1982, pp. 139, 186.
- Francillon 1982, p. 186.
- Francillon 1982, p. 187.
- Taylor 1965, p. 244.
- Andrade 1979, pp. 77–78.
- Job, Macarthur. "Horror at Coolangatta." Flight Safety Australia, via casa.gov.au, November–December 1999, p. 47. Retrieved: December 5, 2011.
- Francillon 1982, p. 194.
- Andrade, John. U.S. Military Aircraft Designations and Serials since 1909. Hersham, Surrey, UK: Midland Counties Publications, 1979. ISBN ISBN 0-904597-22-9.
- Francillon, René J. Lockheed Aircraft since 1913. London: Putnam & Company, 1982. ISBN 0-370-30329-6.
- Stanaway, John C. Vega Ventura: The Operational Story of Lockheed's Lucky Star. Atglen, PA: Schiffer Publishing, 2000. ISBN 0-7643-0087-3.
- Taylor, John W. R. Jane's All The World's Aircraft 1965-66. London: Sampson Low, Marston, 1965.
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