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| Title: | Aircraft Propeller Vibration Measurement System | ||||
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| Author: | Richard C. Dorshimer | ||||
| Abstract: | A slip ringless propeller-mounted data system has been designed, fabricated and tested for the measurement of propeller blade stain during flight and ground operation of an instrumented aircraft. This data system is self-powered through the rotary motion of the test propeller, employs a 16 channel constant bandwidth Freejuency Modulated (FM) Multiplex and signals are capacitively coupled from the propeller to the aircraft. The FM Multiplex consists of 17 channels of information including propeller rpm and 16 strain gage channels containing information from dc to 1 kHz. An environmentally protected strain gage installation has also been a consideration of this program. The FM Multiplex is split into four groups of signals with a frequency translation process in order to conserve bandwidth and/or recording time on an airborne tape recorder. Seven additional data channels are provided on board the aircraft for inclusion of parameters needed to define the aircraft operating conditions. The data system was demonstrated for a period of 50 hours on an engine test stand during which the demodulated signals were observed and additional data was obtained relative to the system stability. |
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| Report: | NA-69-23 | Pages: | 118 | Size: | 40.8 MB |
| Title: | Fire Growth And Flashover In Model Enclosures Simulating Airplane Cabins | ||||
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| Author: | D. Gross | ||||
| Abstract: | A previous report [1] described preliminary experiments on laboratory models of fire development in enclosed spaces. Using a 20 x 40 inch chamber it was found that within certain ventilation and physical property limits flaming ignition of a wall lining specimen by radiant heating would occur; and outside these limits flaming ignition would not occur. This report summarizes additional tests performed in this chamber using small cubes of polyurethane cushioning foam, similar to that used in seat cushions. A larger chamber, 24 x 24 x 192 inch long, propagate down a long chamber. The polyurethane foam was exposed in a variety of ways, viz. open flame ignition, radiant heating and internal heating using an embedded electrical heater. At this time only a summary of the experimental work is being presented. The analysis of the data and a projection of the findings will be presented in a later report. |
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| Report: | FSR-0168 | Pages: | 22 | Size: | 1.24 MB |
| Title: | Simulation Test Of The Arcata, California Diamond Runway Centerline | ||||
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| Author: | Gus Brown, Richard Sulzer | ||||
| Abstract: | The guidance value of the Arcata diamond rllnway centerline paint markings was tested by comparison with the U. S. standard centerline markings in the Dalto/P-3 visual simulation facility. Twenty experienced pilots participated in the testing. Results generally favored the U. S. standard centerline consisting of a 3-foot-wide interrupted stripe with l20-foot painted length and 80-foot gaps, as opposed to the lO-foot maximum width diamonds with 75-foot length and spacing. The only exception was that the diamonds were seen farther away prior to touchdown, a result that is attributed to the one-third larger total painted area. | ||||
| Report: | FAA-NA-69-9 | Pages: | 26 | Size: | 4.5 MB |
| Title: | Friction Effects Of Runway Grooves, Runway 4R-22L John F. Kennedy International Airport - Phase II | ||||
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| Author: | William A. Hiering, Charles R. Grisel | ||||
| Abstract: | Wet and dry runway friction tests were conducted in concrete Runway4R-22L at John F. Kennedy International Airport, New York City, using a Fixed Slip Runway Friction Tester. These tests were conducted to determine if significant friction increases or decreases were generated as a result of transversely grooving the runway surface with 3/8 inch wide, 45 degree, V-shaped grooves, having a 1 3/8 inch pitch. Data analysis indicates that at the test speeds of 50 and especially 60 mi/h, an appreciable increase in overall wet runway friction values due to grooving was obtained for these series of tests. In addition, the treatment of the runway surface by the cutting of uniformly spaced grooves markedly smoothed the resultant wet runway friction values. The chemical removal of rubber from the touchdown area of the 22 end of the ungrooved runway substantially improved the friction values of this end compared to those of the untreated 4 end. | ||||
| Report: | FAA-NA-69-8 | Pages: | 46 | Size: | 6.50 MB |
| Title: | Physio-Chemical Study of Fire Resistant Materials For Aircraft Cabins | ||||
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| Author: | C. Giori | ||||
| Abstract: | A multidisciplinary program is proposed to investigate the combustion and flame resistance of synthetic materials used in aircraft cabins. The physio-chemical properties of these materials and their thermal decomposition products (smoke, toxic vapor) will be studied by combined analytical methods such as thermal analysis and gas chromatography and thermal analysis and simultaneous mass spectrometry. The results will be correlated to the functional groups, structure and physio-chemical parameters of the polymers which are related to the release of smoke and toxic vapors during accidental combustion. This approach will permit the examination of many more materials than would be otherwise possible in a given time period. Improved formulations will be developed and tested under simulated infield conditions and compared to commercially available test materials. IITRI has had continuing programs in combustion and heat resistant materials as well as fire, which will undoubtedly contribute to the success of this project. | ||||
| Report: | FSR-0242 | Pages: | 25 | Size: | 4.16 MB |
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