Some RW D.XXI variations from Secret Projects ...
Fokker D.XXII series concepts
Ontwerp 150 - 1375 hp Bristol
Hercules, inward-retracting u/c, 525 km/h
Ontwerp 151 - 1030 hp RR
Merlin (chin rad), inward-retracting u/c, 530-535 km/h
Ontwerp 152 - 1090 hp DB 600H (belly rad), inward-retracting u/c, 535 km/h
http://www.secretprojects.co.uk/forum/index.php/topic,3514.0.htmlFokker D.XXIV concept
Ontwerp 192 - [??] hp Bristol
Perseus, inward-retracting u/c, June 1939
- While the the D.XXII variants were evolutions of the the D.XXI, the D.XXIV was more straightforward - essentially just a
Perseus-powered D.XXI with Fokker's preferred retractable undercarriage.
http://www.nederlandseluchtvaart.nl/forums/f13-fokker/fokker-d-xxiv-20769/Ontwerp 197 - 425 hp Wright
Whirlwind, 2-seat trainer D.XXI deriv., Sept 1939
- NB: Competition won by the Koolhoven FK-56 (already flying in June 1938).
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Ontwerp 197 perhaps something akin to the D.XXI-derived Hispano HS-42 trainer?