The Koolhoven F.K.50 ten passenger airliner of 1935 was a more powerful F.K.48. The first was used by Alpair until about 1962.
The type was first built with single fin & rudder, later with twin vertical surfaces.
Engines; 2 x P&W Wasp Junior 303kw(406 hp)
Max. speed 295 km/h