et ee wie eae ee el ew ee ee ee ee ee PREFACE The untiring efforts of Lt. Francis Williams, Assistant Project Officer of Project 5.3, in accomplishing seemingly #mpoesible assignments in a minimur of time contributed greatly to the suaress of the B~36D participation. Much credit is due the flight crews who take the risks involved in atomic testing, while relying for their safety upon the proficiency of the research engineers. Their cooperation and willimgness was most gratitying. In particular, the author wishes to express bis appreciation for outstanding ccoperation and assistance to Lt. Col. Jerry Hunt, Aircraft Commander; Lt. Col. Harold Upton, Radar CGperator; amt Maj. Samual Baker, Flight Engineer, all of the Strategic Air Command, The portion of this project using the point lmad method was supervised by Mr. J. C. Lehmkuhl of the Structures Brandn, Aircraft Laboratory, WADC, Mr. Lehmkuhl's interest in the point load metthod rendered possible the measurement of the B-26D horizontal tail loads ty this new and completely independent method. The assistance of the Cook Research Laboratories and the Consolie dated Vultee Aircraft Corporation in conducting the point load calibra~ tion was freatly appreciated. i" wee woe , > Data relative to method and conditions of exposure are included. Instrumentation details have been omitted, except where non~ standard equipment or procedures were employed. Analysis of the data has been limited to that required to establish the coherence of the data, The author wishes to take this opportunity to express his appreciation to the many individuals and organizations sho have contributed to the successful completion of this project. Speeifically acknowledged in the following paragraphs are a few of the individuals and organizations who provided the assiduous effort which is so necessary to the success of any operation. ot tion versus time. a are presented in this report. All usable response data have been presented as curves of the func- . The primary purpose of this report is the presentation of the re~ sponse data obtained by Project 5.3 on the exposure of a B~36D aircraft during Shot 9 of Operation UPSHOT-KNOTHOLE. The work was conducted to provide data to supplement similar measurements made during Operation IVY, Because of the direct relation between the work performed on the two operations and the desirability of having the composite data available in a single reference, the results of both IVY and UPSHOT=KNOTHOLE