First S.IX for the Netherlands army. The naval version of the S.IX elementary trainer was powered by a Menasco Buccaneer inline engine, the army version by an Armstrong Siddeley Genet Major radial. Licence production of the Genet by the Kromhout company in Amsterdam proved troublesome and used engines had to be purchased in Britain for the first twelve aircraft. Photo from: Nederlands Instituut voor Militaire Historie
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