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Dutch Modelling and Aviation

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In Memoriam

Klaas Willem Jonker
(Wilko)
† April 30, 2018

On Monday 30 April 2018, Wilko Jonker died after a long illness at the age of 58. He leaves behind a wife and two children. The Dutch military aviation and plastic modeling were his hobby and on this website he shared all the knowledge he has collected over the years. His hobby has been able to distract him from the persistent disease in his body until the last week of his life. The contacts with other hobbyists were a major support for him.

This website will be maintained by different people for as long as possible, so that other enthusiasts can continue to benefit from extensive content.

Lockheed L-12a en 212

History

About a year after the Lockheed Electra was released in 1910, Lockheed began to develop a smaller version, the Lockheed Model 12 Electra Junior, which was fitted with the same engines.
The first flight was in June 1936.

U.S. Navy received seven aircraft and the USAAC bought a dozen examples under the designation under the Lockheed C-40 and C-40A.
Several businessmen inside and outside the U.S. bought the Lockheed 12A.
Ninety examples of the Lockheed 12A were eventually built.
In September 1937, the Lockheed Model 12B and 12-3 in 1941, both with stronger engines, were released.
A total of 130 Electra Juniors were built in five different versions.

Just before the war two aircraft were used for photo reconnaissance by Sydney Cotton, who had converted a number of aircraft and thus performed photo flights for the Intelligence Services at great height over Germany and Italy.

Versions

Model 12A:
70 examples of the original version equipped with two Pratt & Whitney R-985 Wasp Junior SB radial engines rated 450 hp each.
  • C-40: Three examples for USAAC for five passengers; From January 1943 and on designated as UC-40.
  • C-40A: Ten examples foor USAAC for transport of passengers and freight plus one converted C-40B; From January 1943 and on designated as UC-40A.
  • C-40B: One example for testing fixed undercarriage; later converted to C-40A
  • C-40D: Eleven impressed civil Model 12As. From January 1943 and on designated as UC-40D.
  • JO-1: One example built for US Navy for five passengers.
  • JO-2: Five examples built for US Navy and Marine Corps for six passengers.
  • XJO-3: One examples with fixed undercarriage built for US Navy for testing landings on aircraft carriers.
  • R3O-2: One Model 12A impressed by the US Navy.
Model 12B:
Two examples for the Argentine army equipped with two Wright R-975-E3 Whirlwind radial engines rated 440 hp each.
Model 12-25:
Two examples with two Pratt & Whitney R-985 Wasp Junior SB3 radial engines.
Model 212:
trainer with bomb racks, dorsal turret. Sixteen examples built plus one prototype, for NEIAF.
Model 12-26:
transport version of the Model 212; twenty examples built for NEIAF.

 

Technical information Lockheed 12A
Dimensions:
Length: 11,07 m Wingspan: 15,09 m
Height: 2,97 m Wing area: 32,7 m2
Weights:
Empty weight: 2615 kg Max. start weight: 3924 kg
Performances:
Max. speed: - km/hr Climbing speed: 427 m/min
Cruising speed: 362 km/hr    
Range: 1287 km Service ceiling: 6980 m
Miscellaneous:
Engine type: Two Pratt & Whitney R-985 AN-2 Wasp Jr rated 450 hp each
Crew: -
Armament: None

 

Technical information Lockheed 212
Dimensions:
Length: 11,07 m Wingspan: 15,09 m
Height: 2,97 m Wing area: 32,7 m2
Weights:
Empty weight: 2703 kg Max. start weight: 3883 kg
Performances:
Max. speed: - km/hr Climbing speed: 427 m/min
Cruising speed: 362 km/hr    
Range: 1287 km Service ceiling: 6980 m
Miscellaneous:
Engine type: Two Pratt & Whitney R-985 AN-2 Wasp Jr rated 450 hp each
Crew: -
Armament: Two fixed forward firing machine guns in the nose; on moveable machine gun in a turret