Report presenting performance tests of thermal ice-prevention equipment designed and installed in the XB-24F airplane in icing and non-icing conditions. The recorded temperature and air-flow data, and the calculated quantities of heat flow throughout the system are presented in tabular form.

General formulas are given for propellers for the rate of change of side-force coefficient with angle of yaw and for the rate of change of pitching-moment coefficient with angle of yaw. Charts of the side-force derivative are given for two propellers of different plan form. The charts cover solidities of two to six blades and single and dual rotation. The blade angle ranges from 15 degrees or 20 degrees to 60 degrees.

Front: Text describes action on various war fronts: China, Air Offensive, Aleutians, Russia, North Africa, Southwest Pacific. Maps: Global map of war fronts; China, Burma, Mongolia, Japan. Photographs: Nazi sub sank after charged by The U.S. Coast Guard Cutter Spencer; The enterprise "Workhorse of War"; Yanks in India; Six B-24's of the U.S. Army Eighth Air Force attacking the port at Kiel in northern Germany. Back: "Secret" weapons are the little drops of information that you could give away! [Illustrations of the importance of keeping a military secret.]