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Hmmm... Didn't even know Kellett Aircraft still existed in the 1960s. Apparently they served as a subcontractor on VTOL research. Check these too:EFFECTS OF AIRFRAME GEOMETRY ON DOWNWASH PROBLEMS OF TANDEM DUCTED-PROPELLER VTOL AIRCRAFTHELICOPTER STATIC ELECTRICITY DISCHARGING DEVICEON THE AERODYNAMIC DESIGN OF PROPELLERS AND DUCT SYSTEMS FOR GROUND EFFECT VEHICLESDETERMINATION OF OPTIMIZED PROPELLERS FOR GROUND EFFECT MACHINESHELICOPTER STATIC-ELECTRICITY MEASUREMENTSHELICOPTER STATIC-ELECTRICITY MEASUREMENTS (different)
Hmmm... Didn't even know Kellett Aircraft still existed in the 1960s. Apparently they served as a subcontractor on VTOL research. Check these too:
EFFECTS OF AIRFRAME GEOMETRY ON DOWNWASH PROBLEMS OF TANDEM DUCTED-PROPELLER VTOL AIRCRAFT
HELICOPTER STATIC ELECTRICITY DISCHARGING DEVICE
ON THE AERODYNAMIC DESIGN OF PROPELLERS AND DUCT SYSTEMS FOR GROUND EFFECT VEHICLES
DETERMINATION OF OPTIMIZED PROPELLERS FOR GROUND EFFECT MACHINES
HELICOPTER STATIC-ELECTRICITY MEASUREMENTS
HELICOPTER STATIC-ELECTRICITY MEASUREMENTS (different)
