C-56/ C-57 / C-59 / C-60 / C-66 - Lockheed Model 18 Lodestar
| model | C-60 |
| Armament | None |
| Engines | Two Wright R-1820-87s of 1,200 hp each |
| Crew | Four (plus 17 passengers) |
| Maximum speed | 257 mph |
| Cruising speed | 232 mph |
| Range | 1,700 miles |
| Service ceiling | 25,000 ft. |
| Span | 65 ft. 6 in. |
| Length | 49 ft. 10 in. |
| Height | 11 ft. 1 in. |
| Weight | 18,500 lbs. maximum |
| Model Number | Engine Type | Standard Gross Weight 1b. | Weight Empty lb. | Useful Load (Standard) lb. |
| 18-10 | P & W S1C3-G | 17,500 | 12,216 | 5,284 |
| 18-14 | P & W S4C4-G | 17,500 | 12,291 | 5,209 |
| 18-40 | Wright G-102A | 17,500 | 11,633 | 5,867 |
| 18-50 | Wright G-202A | 17,500 | 11,830 | 5,664 |
| 18-56 | Wright G-205A | 17,500 | 11,846 | 5,654 |
| Variant: | |
| XR50-1 | The only aircraft with Wright R-1820 Cyclone with a power of 1200 HP, acquired to assess by the U.S. Coast Guard. |
| R50-1 | Designation of three headquarters aircraft: two in the United States Navy and one in the United States Coast Guard; equipped with Wright R-1820-97 cyclonn Power engines 1200 HP |
| R50-2 | The only U.S. Navy aircraft with Pratt & Whitney engines R-1690-25 Hornet with a power of 850 hp |
| R50-3 | Three aircraft purchased by the U.S. Navy as transport for "very important persons", with the Pratt & Whitney R-1830-34 A engines with a power of 1200 hp |
| R50-4 | Designation of 12 passenger aircraft, built for civilian buyers and requisitioned for the U.S. Navy; Equipped with Wright R-1820-40 engines with a power of 1200 hp |
| R50-5 | Designation for 41 aircraft, analog of the U.S. Air Force aircraft, but equipped as 14-seater passenger aircraft; intended for the U.S. Navy. |
| R50-6 | The designation of 35 aircraft, analog of the U.S. Air Force C-60A, but equipped as 18-seater transport for parachute-landing groups. |
| C-56 to C-56E | 36 commercial aircraft Lodestars, which were requisitioned for the U.S. Air Force. |
| C-57 / C-57B | 20 commercial Lodestar aircraft requisitioned for the US Air Force. |
| C-57C | Designation of three C-60a aircraft after re-equipping of the Pratt & Whitney R-1830-43 with a power of 1200 hp |
| C-57D | Redesignation of one aircraft C-57 and after re-equipping it with the engine for the second time. |
| C-59 | Designation of 10 requisitioned passenger aircraft Lodestar; Seven of them were transferred to the British Air Force on lend-Lease under the designation Lodestar Mk IA. |
| C-60 | Designation 36 requisitioned passenger aircraft Lodestar; 16 of them were transferred to the British Air Force on lend-Lease under the designation Lodestar Mk II. |
| C-60A | Under this designation, 324 new aircraft were built for the U.S. Air Force, equipped as an 18-seater transport for parachute troopers with Wright R-1820-87 engines with a power of 1200 hp. |
| XC-60B | The only experimental aircraft acquired by the U.S. Air Force to evaluate air-thermal de-icing system. |
| C-60C | Proposed as Transport for transportation of 21 persons of personnel; was not built. |
| C-66 | The only aircraft equipped as VIP Transport for the President of Brazil. |
| C-104 | Original designation for C-60C |
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