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The Koolhoven F.K.42 was a parasol-wing, two-seat training monoplane manufactured by Koolhoven in the Netherlands. Only one was built.
The Parnall Parasol was an experimental parasol winged aircraft design to measure the aerodynamic forces on wings in flight. Two were built and flown in the early 1930s in the UK.
The Junkers T 19, originally known as the J 19, was a single-engined parasol winged all-metal 2/3-seat aircraft built in Germany in the early 1920s for training and touring. Its construction was too expensive for commercial success and only three were built, one later finding use as an engine test-bed.
The Junkers T 23 was a two-seat, single-engined experimental training aircraft, built in Germany in the early 1920s. It could be configured either as a parasol winged monoplane or as a biplane to compare handling characteristics. 4 were constructed.
The Farman F.280 was a three engine, cantilever wing monoplane designed in France as a mail carrier in the early 1930s. Underpowered and slow, only two were built and briefly used.
The Morane-Saulnier MS.341 was a single engine parasol wing training and touring aircraft built in France in the mid-1930s. It had two open cockpits in tandem and was sold to private owners, clubs and the Armée de l'Air.
The Tachihi R-53 was amongst the first aircraft built in Japan after the relaxation of the ban imposed at the end of World War II. It is a parasol-wing, two seat, training aircraft powered by a British engine. Only one was produced.
The Carley C.12 was a small Dutch single seat sporting monoplane from the 1920s. There were several developments but only small numbers were produced.
The Pander D was a small Dutch single-seat sport monoplane, an evolution of the Carley C.12 of 1923. Ten were built.
The Pander E was the first indigenous Dutch training aircraft, used by clubs and also privately owned. A two-seat, single-engine biplane, 17 were built in the Netherlands from 1926 with engines of increasing power.
The Pander P-1 and P-2 were close to-identical single engine Dutch sports aircraft with tandem seats and a parasol wing, first flying in 1929. Only two were built.
The Pander Multipro was a two/three seat light monoplane aircraft with a high, braced wing, designed in the Netherlands in the early 1930s. Powered by a Pobjoy radial engine, three were built.
The Koolhoven F.K.47 was a 1930s one-off two seat biplane designed and built in the Netherlands for an individual customer as a sport and touring aircraft.
The Koolhoven F.K.44 was a two-seat, single engine sport monoplane designed and built in the Netherlands in the early 1930s. It was built to order, but only one was completed.
The Koolhoven F.K.45 was an aerobatic biplane built to the requirements of one pilot who flew it at airshows in the mid-1930s. Only one was built.
The Koolhoven F.K.54 was a Dutch single-engine, three-seat touring aircraft with a retractable undercarriage. It flew shortly before the start of World War II and its development was abandoned after its first flight as attention turned to military aircraft.
The NVI F.K.35 or Koolhoven F.K.35 was a two-seat fighter aircraft built in the Netherlands during 1926. It was completed and exhibited but, through a combination of ground accident and financial problems, never flown.
The LFG Roland D.XV was a World War I German single seat fighter aircraft, ordered as a test-bed for engine comparisons. It was distinguished from earlier Roland biplane designs by the elimination of flying wires. Two later aircraft, also called LFG Roland D.XV, were completely different designs with slab sided fuselages.
The LFG Roland D.XVII was a single-seat, single-engine, parasol wing German fighter aircraft flown close to the end of World War I. Only one was built.
The Bloch MB.90 was the first all-metal French light aircraft. Only two aircraft were completed, making their first flights in 1932, though there were several variants.
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