My Mother\u27s Kitchen

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Accelerations in Flight

This work on accelerometry was done at McCook Field for the purpose of continuing the work done by other investigators and obtaining the accelerations which occur when a high-speed pursuit airplane is subjected to the more common maneuvers. The accelerations obtained in suddenly pulling out of a dive with well-balanced elevators are shown to be within 3 or 4 per cent of the theoretically possible accelerations. The maximum acceleration which a pilot can withstand depends upon the length of time the acceleration is continued. It is shown that he experiences no difficulty under the instantaneous accelerations as high as 7.8 G., but when under accelerations in excess of 4.5 G., continued for several seconds, he quickly loses his faculties

Upholstered household furniture in the United States: A survey of current ownership and purchasing plans

This report presents highlights of the results of a telephone survey of U.S. households concerning their ownership, purchasing plans, and preferences regarding upholstered household furniture. The survey was conducted in October and November 1989, by the Survey Research Unit of the Social Science Research Center of the Mississippi Agricultural and Forestry Experiment Station. The SUl\u27Vey also included Canadian households, and subsequent reports will present results for Canada as well as statistical analyses of specific results for both countries. The sUl\u27vey was intended to help identify market potential for various items of upholstered household furniture, and the results are therefore not dependent on short-term economic conditions. The economic recession in the United States since the 1989 survey does not affect the validity of results; market potential becomes sup· pressed demand in an economic downturn

Water Tunnel Tests of the 7.2 Chemical Rocket

This report covers tests of a 2" diameter model of the 7.2" Chemical Rocket to determine its performance and possible means of increasing stability and reducing dispersion. The rocket was tested with the two original tails, the ring tail designated herein as No. 61 and the ring tail with extended fins designated No. 62. Three other tail designs were tested designated No. 63, No. 67, and No. 68. Of these, No. 67 was the only one that produced results superior to the No. 61 and No. 62 designs. This No. 67 Tail has extended fins similar to Tail No. 62 and projects beyond the nozzle about one diameter. Details of these tails are given in Figure 12. Tail No. 62 gave a restoring moment 50% greater than Tail No. 61, and Tail No. 67 gave a restoring moment 45% greater than Tail No. 62, both values being for 5° yaw. It is believed that Tail No. 67 represents about the best that can be done in redesigning the tail, as it produced a fairly high moment, a very large center-of-pressure eccentricity, and only one of the five tails tested has a lower drag coefficient. In this connection it should be noted that all the tails tested gave, without exception, adequate stability to the projectile to insure satisfactory flight after burning is completed. Therefore, the only benefit to be obtained from an increase in the stability above that produced by the original ring tail (No. 61) must come from whatever reduction it might effect in the dispersion occurring during the burning of the propellent. Calculation of the period of oscillation of the projectile in flight, and the equivalent wave length, makes possible a comparison of projectile performance from the standpoint of dynamic stability It can be shown that, for rockets with long burning times, the shorter the wave length for a given projectile, the less will be the dispersion. Using this measure of dispersion, Tail No. 67 would be expected to produce 1S% less dispersion than Tail No. 62, and Tail No. 62, i8% less than Tail No 61. This investigation leads to the conclusion that the No. 61, No. 62, and No. 67 Tails will give a high degree of static stability and it is improbable that much more can be accomplished by a redesign of the tail. It is also a fact that the dynamic stability of the projectile cannot be materially improved if its present physical dimensions are to be retained. The conclusion must, therefore, be reached that the most effective means of lowering the dispersion of this rocket is by reducing the malalignment of the jet with the axis of the projectile and eliminating as far as possible asymmetry in the tail assembly

Water Tunnel Tests of the British "Squid" Projectile Type "C" with Two Alternate Flat Noses

This report covers tests to determine the performance of the "Squid" with three designs of nose, designated No. 42, No 45, and No 46. Practically the only difference in the three noses is in the diameter of the flat face, these diameters being 7.90", 8.93", and 9.95", respectivel

Creating Professional Learning Communities in a Traditional Educational Leadership Preparation Program

During its 50-year history, the University Council for Educational Administration (UCEA) has witnessed both the development and subsequent demise of innovations in leadership preparation programs

Discount Rates for Nonindustrial Private Forest Landowners in Mississippi: How High a Hurdle?

Mississippi forest landowners were surveyed to determine average discount rates or “hurdle rates”—the lowest rates of return they consider acceptable—for 3 nonforestry investments, and for 5, 15, and 25 yr forestry investments. The survey included 829 individuals who owned at least 20 ac of uncultivated land and had harvested timber during a recent 5 yr period; survey results are therefore oriented toward commercially active forest landowners. On average, the private nonindustrial forest landowners included in the survey expect timberland investments to earn higher rates of compound interest than relatively low-risk bank savings accounts and certificates of deposit. Relatively short-term (5 yr) timberland investments, however, have lower minimum rates of return than stocks, bonds, and mutual funds. With forestry investments, all else equal, Mississippi nonindustrial private forest landowners prefer shorter time periods—average hurdle rates in nominal terms before taxes were 8.0% for forestry investments lasting 5 yr, 11.3% for those lasting 15 yr, and 13.1% for those lasting 25 yr. Household income significantly influenced the lowest rate of return considered acceptable for 5 yr forestry investments—the rate was 9% for landowners with annual incomes above $50,000 and 7.4$50,000. On a hurdle rate basis, higher income private landowners in Mississippi generally find forestry investments lasting 15 yr to be competitive with stocks, bonds, and mutual funds. However, Mississippi landowners’ 13.1% required rate of return for 25 yr forestry investments was higher than the rate considered acceptable for the other investments included in the survey. Reforestation tax incentives, cost-shares, and related public policies that reduce the front-end costs incurred by NIPF landowners tend to increase the projected rate of return for relatively long-term reforestation investments. South. J. Appl. For. 26(1):26–31

Raw materials use by Mississippi furniture manufacturers, 1989

Mississippi\u27s furniture industry has grown rapidly in recent years and now ranks nationally in production of specific types of furniture. Furniture pmducers in the state use many types of wood and nonwood raw materials. Raw materials expenditures were almost $330 million for 92 firms that responded to a 1989 survey. The survey included upholstered and nonupholstered furniture producers as well as hardwood dimension and frame producers. Substantial amounts of these raw materials were obtained from suppliers within the state