This aircraft was the production version of the H-2 model and the last in the development sequence of ram-jet powered rotorcraft beginning with the NHI H-1. All the aircraft in this family were built upon patents held by Jan Meijer Drees. The aircraft was certified (in the Netherlands) in March 1958.
The aircraft had a 1-bladed tail rotor to provide directional stability (no anti-torque capability was needed as the rotor was directly driven by the ram-jets at the tip of the blades).
Note: In some references the aircraft is named as 'Kolibri'. The name 'Kolibrie' is assumed to be correct as this is the name shown on the aircraft in various images.
VTOL type: Helicopter
Lift configuration: Single main rotor
Dedicated control device: Tail rotor
Crew required: 1
Crew seating: Side-by-side
Landing gear: Skids
Total number of engines: 2