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Single-seat fighter monoplane
The Koolhoven F.K.55 photographed prior to its single flight test.
The Koolhoven F.K.55 Single-seat Fighter Monoplane (1,000 h.p. Lorraine "Sterna" engine driving two airscrews in opposite directions).
The Koolhoven F.K.55 during ground trials at Welschap airfield.
The sensational Koolhoven fighter with its twin airscrews and Lorraine Petrel engine mounted behind the pilot.
The latest version of the Lorraine Sterna with extension shaft and oppositely rotating airscrews. This combination has been fitted in the Koolhoven F.K.55 fighter.
TWIN-SCREW. The Koolhoven single-seater fighter to be shown at the Paris Salon has two airscrews revolving in opposite directions.
The arrangement of the power plant and extension shaft of the F.K.55.
The method of driving the two airscrews of the Koolhoven (Lorraine Petrel).
A cooling "gill" on the New Koolhoven fighter.
The F.K.55 in its proposed definitive form with retractable undercarriage.