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Technical Paper

DESIGN FOR FATIGUE

1954-01-01
540226
STEPS in fatigue design of aircraft lower wing surfaces, as presented here, are: 1. Selecting a structure that permits easy fatigue-crack detection. X-ray inspection of blind areas is suggested. 2. Setting a design quality standard. This is the important stress-concentration factor Kt, which is shown to have a lower practical limit. 3. Choosing a design gross area stress rather than net section stress to give the desired life. The gross area stress is also a better basis than the 1.0g operating stress level for comparing fatigue life in similar aircraft. 4. Step testing to check design quality. This preferred method of fatigue testing is discussed here.
Technical Paper

Deaerating Cold-Weather Oil Systems

1954-01-01
540228
AERATION and cold-temperature starting problems faced by aircraft-engine designers are said to be solved by use of the deaerating cold-weather oil system described in this paper. In this system, all the oil in the tank circulates through the engine rather than the small volume of oil circulated by the conventional system.
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