NLL Verslagen en verhandelingen XVIII - 1953. A.1205. The field of flow through a helicopter rotor obtained from windtunnel smoke tests. NLL Verslagen en verhandelingen XVIII - 1953. V.1535. Airflow through helicopter-rotors in vertical flight. 4343D Electrical manual - Rotary consumer equipment (airborne) Vol. 1: General and technical information (deel 2 van 2) 4343D Electrical manual - Rotary consumer equipment (airborne) Vol. 6: Repair and reconditioning instructions (deel 2 van 3) 4343D Electrical manual - Rotary consumer equipment (airborne) Vol. 6: Repair and reconditioning instructions (deel 3 van 3) Algemene- en bouw-informatie; collectie Zevenbergen. Telex van LETS aan CLO d.d. 24-11-87 m.b.t. beschikkingstelling mainrotorhead wasp aan HTS Haarlem (1 pag.) Algemene- en bouw-informatie; collectie Zevenbergen. Overzicht begroting/betalingen aanmaak (delen) replica Fokker D.XXI Combat Aircraft Prototypes since 1945 Groten van het Luchtruim Wright brothers Windtunnels - vroeger en nu Airscrews (part II) : dealing with Rotol, Curtiss, Hamilton and Hele-Shawn Beacham Airscrews, with notes on Inspection and Maintenance