Inlet technology for powered-lift aircraft

The concepts, analytical tools, and experimental data available for designing inlets for powered lift aircraft are discussed. It is shown that inlets can be designed to meet noise, distortion, and cruise drag requirements at the flight and engine operating conditions of a powered lift aircraft. The penalty in pressure recovery for achieving the required noise suppression was 0.3 percent

Exploring in aerospace rocketry. 9 - Rocket trajectories, drag, and stability

Mathematical model of rocket trajectories, drag, and positive static stabilit

Incidence angle bounds for lip flow separation of three 13.97-centimeter-diameter inlets

Low speed wind tunnel tests were conducted to establish a procedure for determining inlet-lip flow separation and to make preliminary examination of the incidence angle bounds for lip flow separation on inlets intended for the nacelles of STOL (short takeoff and landing) aircraft. Three inlets were tested. Two of the inlets had short centerbodies with lower lip area contraction ratios of 1.30 and 1.44. The third inlet had a cylindrical centerbody extended forward into the inlet throat with a lower lip area contraction ratio of 1.44. The inlets were sized to fit a 13.97 centimeter-diameter fan. For inlet throat Mach numbers less than about 0.43, the lip flow separation angle was increased by either increasing the ratio of throat velocity to freestream velocity (Vt/Vo) or by increasing the lower lip area contraction ratio. For throat Mach numbers greater than a certain value (ranging from 0.43 to 0.52), increasing throat Mach number in some cases resulted in a decrease in the lip flow separation angle. Extending a cylindrical centerbody into the inlet throat increased the flow separation angle for nearly all values of Vt/Vo

Measurement of model propulsion system noise in a low-speed wind tunnel

Methods are presented for making overall and directional acoustic measurements with forward velocity in the Lewis 9 x 15 V/STOL wind tunnel. Overall acoustic measurements are discussed; the acoustic calibration methods, instrumentation features, and types of experiments are presented. Selected data are presented as examples of the various types of overall measurements that are possible. The method of making directional acoustic measurements is presented, and the necessary alterations to the tunnel, specialized acoustic instrumentation, and calibration details are described. The results indicate that relative overall acoustic measurements can be made successfully and that directional acoustic measurements are feasible

How to be Human

http://deepblue.lib.umich.edu/bitstream/2027.42/108410/1/lyzz_1366857850.pd

A Letter of E. Ravenshorst, Ommen, to Rev. Albertus C. Van Raalte

A letter of E. Ravenshorst, Ommen, to Rev. Albertus C. Van Raalte, about many people and news items which he considers would be of interest to A.C.V.R.. Two people mentioned are Blikman and Bolckel. Ravenshorst is reporting on a Mr. Mansier, Van Raalte\u27s brother-in-law. The letter is a mine of information about family and business matters.https://digitalcommons.hope.edu/vrp_1860s/1027/thumbnail.jp

Supersonic STOVL aircraft with turbine bypass/turbo-compressor engines

Three propulsion systems for a Mach 2 STOVL fighter were compared. The three propulsion systems are: (1) turbine bypass engine with a turbocompressor used for STOVL only; (2) turbine bypass engine with a turbocompressor for both STOVL and thrust during forward flight; and (3) mixed flow afterburning turbofan with a remote burner lift system. In the first system, the main engines have afterburners and the turbocompressors use after burning during STOVL. In the second system, the turbine bypass engines are dry and the turbocompressors have afterburners. The mission used in the study is a deck launched intercept mission. It is indicated that large improvements in combat time are possible when the turbocompressors are used for both left and thrust for forward flight

Religion, Science, and Truth in the Human Experience: Poetry as Living Synthesis in Walt Whitman’s Leaves of Grass

Walt Whitman’s great masterpiece Leaves of Grass stands out in the canon of nineteenth-century American poetry for both its innovations in form and its bold ventures into controversial subjects. One such subject is the role of science as opposed to religion in shaping the modern worldview. Whitman’s poetry alternately and at times simultaneously expresses both materialistic and metaphysical cosmologies, criticizing and casting away ancient traditions as often as he calls on them for inspiration. In this paper I explore the influence of contemporary science on Whitman’s worldview, analyze how its theories shape the cosmology presented by his poetry, and discuss the complex relationship between Leaves of Grass and the legacy of Western religion and literature out of which it grew—and continues to “grow” with each new reading. Ultimately I argue that Whitman seeks to discover and express truth in all its forms, which means engaging directly with the natural world, then embracing both the objective hard data we draw from it as well as our own subjective, even spiritual, experiences. Since neither religion alone nor science alone allows for this complex and often cognitively dissonant relationship to the world, he preaches a new way forward: poetry will offer the grand transcendent synthesis of the two, encompassing all truth and continuing to evolve as a living entity within humanity generation by generation going forward

Efficient planetary parking orbits with examples for Mars

Planetary parking orbits with examples for Mar

Performance Analysis of Application of Rocket Engines to Interceptor Airplanes

Missions for which a rocket interceptor is suited and the effect of rocket-engine performance on interceptor performance are discussed. Flight missions for interceptors having rocket and turbojet engines are compared, and circumstances under which a combination of rocket and turbojet may be advantageous are discussed