Standard Aircraft Corporation · Trainer · United States · Pioneer Age (pre-1919)
The Standard J.R. (Junior Reserve) was a refined Standard J-1 variant — Standard Aircraft Corporation's late-WWI development that improved on the J-1's reliability + handling. About 200 Standard J.R.s were built between 1918 and 1919 at Standard Aircraft Plainfield, NJ. The aircraft served U.S. Army Signal Corps + civilian operators in trainer + light-utility roles 1918-1923.
The Standard J.R. used the same Hall-Scott A-7a engine (100 hp) as the J-1 but with refined airframe + improved control surfaces. Maximum speed 124 km/h, range 380 km. The J.R. was Standard's attempt to address the J-1's accident-rate issues by adopting refined control linkages + reinforced airframe + improved engine cowling. The improvements were modest + the J.R. did not notably improve on the J-1's overall reliability.
Standard J.R. service was limited. Production was halted at Armistice (November 1918); surplus airframes were sold to civilian operators 1919-1922 at $200-400 each. Many J.R.s were re-engined with Curtiss OX-5 engines for civilian use. About 0 Standard J.R. airframes survive complete; partial reconstructions exist at a few American museums.
The J-1 is the original 1917-1918 production trainer. The J.R. (1918-1919) is the refined late-WWI development with improved control linkages + reinforced airframe + improved engine cowling. Same Hall-Scott A-7a engine; the J.R. addressed (but did not eliminate) the J-1's reliability issues. Production of both ended at Armistice.