The primary objective of this report is to present data concerning the structural and aerodynamic loads as measured on various types of aircraft, in flight, in the vicinity of an atomic explosion. A secondary objective is to describe the instrumentation (installation, calibration, and operation) in order to provide for the future planning and conduct of similar tests. The data presented herein were obtained on Dog, Easy, and George shots of Operation Greenhouse. The airplanes used to collect these data were B-17's, T-33's, B-50D's and one XB-47. These instrumented airplanes were arrayed at preassigned locations in the air space above the explosions. A total of approximately 250 channels of information were obtained which essentially consisted in wing bending, torsion, and shear at the root, mid-span, and outer panel; horizontal stabilizer bending at the root; normal accelerations at the nose, c.g., and tail; aerodynamic pressures at various locations on the airplanes; and temperatures experienced by various critical components of the airplane. The positions of the airplanes at the time of shock arrival were accurately determined by means of radar tracking. The measured data were correlated by means of time signals, every second, from a land based radio transmitter station, and with reference to time zero, by means of a photoelectric cell. The recorded data show that the loads produced by the shock wave were in general accord with theory. The loading experienced by an airplane while passing through the 'puff' of the atomic cloud is shown to be considerably higher than that caused by the shock wave. For this reason the penetration of the puff should be avoided even by 'sampling' drones.
Operation Greenhouse. Scientific Director's Report of Atomic Weapon Tests at Eniwetok, 1951. Annex 8.1. Blast Effects on Aircraft in Flight. Nuclear Explosion
1951
312 pages
Report
No indication
English
Nuclear Warfare , Aircraft , Blast loads , Nuclear explosion damage , Bending stress , Shear properties , Nuclear explosions , Position(Location) , Structural properties , High temperature , Shock waves , Radar tracking , Surveys , Shock , Fabrics , Aerodynamic loading , Sampling , Pressure , Inflight , Instrumentation , Nuclear clouds , Calibration , Wings , Torsion , Thermal shock , Horizontal stabilizers , Aerodynamic control surfaces , Photoelectricity , Aircraft noses , Charring , Greenhouse operation