Samuel V. Zinn, Jr

Tests were performed to determine acceptance and/or operational limitation of a laboratory device designed to detect dynamite by odor. The function of the machine is to combat bombing sabotage of aircraft by sampling air vapors within an aircraft prior to takeoff and signaling the presence of dynamite. The tests proved that the machine was very reliable in detecting exposed sticks of dynamite in an enclosed room, but detection was questionable when the dynamite was confined in a container. The conclusion indicate that the Chemosensor represents a substantial step in the direction of a workable production device, but considerable further research will still be required to attain that goal.

Richard G. Hill

To evaluate the capability of the Edison-Ultraviolet Surveillance Fire Warning system in detecting fore from burner-can failures.

Fire detectors in service have detected burner-can failures, but also some have gone undetected and often undiscovered until routine ground inspection. A burn-through impinging on a vital aircraft structure could endanger the entire aircraft if an early detection is not obtained.

Gerald Slusher

An accelerated test procedure was developed for possible use to enhance and demonstrate the airworthiness of exhaust systems of single engine aircraft incorporating exhaust gas-to-air heat exchangers. The exhaust systems of seven aircraft were endurance tested on engine stands to determine if the types of failures occurring during the tests were similar to failure occurring in aircraft and to identify design features for minimizing hazards. Evaluation of an exhaust system fabricated of a more corrosion resistant material was included. Testing was conducted either until failure occurred or 600 test hours were accumulated.

The accelerated test schedule and procedure produced failures comparable to those occurring in aircraft with 1 hour of testing equivalent on the average to 3.8 hours of operation in aircraft. It was concluded that the utilization of more corrosion-resistant, nickel iron chromium material would significantly reduce or eliminate those exhaust system failures resulting from high temperature oxidation or corrosion, and that muffler failures and related carbon monoxide hazards could be minimized by the design and construction of airtight cabin ventilating systems in conjunction with the incorporation of muffler designs of the axial flow through type fabricated of a more corrosion-resistant materials.

James W. Gauntner

Flow characteristics of single jets impinging on flat surfaces have been studied by many investigators. The results of some of the numerous studies are summarized herein. Suggested methods for determining velocities and pressures on which to base heat transfer correlations for use in impingement cooling design are presented.

B. Belason, G. Castle, D. Crowley

The people who did much of he test work in the search for suitable heat shield material for the Apollo spacecraft have turned their attention toward fire protection through materials. The authors are part of a thermodynmics laboratory term that is studying the thermal behavior of newly developed materials.