Download or read book Full scale Drop Tests and Scaled Model Wind Tunnel Tests of Ribbon Parachutes written by William B. Pepper and published by . This book was released on 1961 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sandia Corporation has been working on parachute systems for vehicle recovery since 1954. Our general approach has been to treat the parachute as we would other aerodynamic problems such as vehicle stability. We have endeavored to conduct scaled parachute model tests in the wind tunnel to study forces, pressures, and dynamic stability of vehicle-parachute systems.

Download or read book A Parametric Wind Tunnel Study of Ribbon Parachutes written by D. F. McVey and published by . This book was released on 1975 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents the results of a series of wind tunnel tests conducted to define the effect of geometric porosity, reefing line length, and suspension line length on ribbon parachute drag. Twenty degree conical ribbon parachutes with nominal diameter of three feet, goemetric porosities from 15 to 30 percent and line lengths from 1.0 to 2.0 times the parachute nominal diameter were tested at dynamic pressures from 75 to 500 psf. Drag coefficients based on construction and average projected diameters are presented as a function of the independent variables. Data are also presented on parachute shape and inflated diameter. The wind tunnel drag coefficients are compared with data from free flight test of full scale parachutes and with othert wind tunnel data.

Download or read book Transonic Wind tunnel Tests of a Lifting Parachute Model written by and published by . This book was released on 1976 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Wind tunnel Tests of a Series of 18 foot diameter Parachutes with Extendable Flaps written by Berl Gamse and published by . This book was released on 1962 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Wind tunnel Investigation of Drag and Stabili Ty of Parachutes at Supersonic Speeds written by Nickolai Charczenko and published by . This book was released on 1964 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Transonic Wind tunnel Tests of a Lifting Parachute Model written by Jerome T. Foughner and published by . This book was released on 1976 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wind-tunnel tests have been made in the Langley transonic dynamics tunnel on a 0.25-scale model of Sandia Laboratories 3.96-meter (13-foot), slanted ribbon design, lifting parachute. The lifting parachute is the first stage of a proposed two-stage payload delivery system. The lifting parachute model was attached to a foerbody representing the payload. The forebody was designed and installed in the test section in a manner which allowed rotational freedom about the pitch and yaw axes. Values of parachute axial force coefficient, rolling moment coefficient, and payload trim angles in pitch and yaw are presented through the transonic speed range. Data are presented for the parachute in both the reefed and full open conditions. Time history records of lifting parachute deployment and disreefing tests are included.

Download or read book Wind tunnel Tests of Modified Cross Hemisflo and Disk gap band Parachutes with Emphasis in the Transonic Range written by James T. Foughner and published by . This book was released on 1974 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transonic wind-tunnel studies were conducted with modified cross, hemisflo, and disk-gap-band parachute models in the wake of a cone-cylinder shape forebody. The basic cross design was modified with the addition of a circumferential constraining band at the lower edge of the canopy panels. The tests covered a Mach number range of 0.3 to 1.2 and a dynamic pressure range from 479 Newtons per square meter to 5746 Newtons per square meter. The parachute models were flexible textile-type structures and were tethered to a rigid forebody with a single flexible riser. Different size models of the modified cross and disk-gap-band canopies were tested to evaluate scale effects. Model reference diameters were 0.30, 0.61, and 1.07 meters (1.0, 2.0, and 3.5 ft) for the modified cross; and nominal diameters of 0.25 and 0.52 meter (0.83 and 1.7 ft) for the disk-gap-band; and 0.55 meter (1.8 ft) for the hemisflo. Reefing information is presented for the 0.61-meter-diameter cross and the 0.52-meter-diameter disk-gap-band. Results are presented in the form of the variation of steady-state average drag coefficient with Mach number. General stability characteristics of each parachute are discussed. Included are comments on canopy coning, spinning, and fluttering motions.

Download or read book Model Parachutes Comparison Tests of Various Types written by T. W. Knacke and published by . This book was released on 1949 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wind tunnel and drop tests were made on model parachutes of various types, to study the influence o[n] performance of such factors as design, shape, size, load, porosity, and line length. All the unstable parachutes which were tested, such as solid flat, solid conical, and solid spherical types, have a pronounced increase in the drag coefficient C[subscript]D with decreasing rate of descent in the range of 35 to 8[0 fps]. The stable prarachutes, including the high porosity, pseudo-ribbon, guided surface, and ribbon, have a practically constant C[subscript]D. Square and triangular parachutes have higher drag than round parachutes o[f the] same area. Thirty-degree-conical and quarter-spherical parachutes have higher drag than flat and hemispherical parachutes. The Airfoil parachute has higher drag than the standard flat parachute an[d] is fairly stable. The length of the suspension lines influences the drag.

Download or read book Experiments on the Thermal Performance of Ribbon Parachutes written by C. J. Scott and published by . This book was released on 1965 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental heat transfer studies were conducted on full scale ribbons of flat circular type parachutes having a geometric porosity of 20.5 percent. A pressurized subsonic wind tunnel served as the flow facility. The average approach flow velocity was 134 feet per second. The measurements were made in the Reynolds number range of one million to ten million, where the Reynolds number is based on the ribbon width of 2.1 inches and on the velocity and temperature of the flow in the slots between the ribbons. The pressure ratio applied to the ribbon was varied from 1.4 to 26.3. Using a transient energy balance, local and average heat transfer data were obtained and compared with available analyses.

Download or read book Wind tunnel Investigation of the Static Aerodynamic Characteristics of a Multilobe Gliding Parachute written by George M. Ware and published by . This book was released on 1968 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comparison of Tail and Wing tip Spin recovery Parachutes as Determined by Tests in the Langley 20 foot Free spinning Tunnel written by Robert William Kamm and published by . This book was released on 1946 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summary: Tests of spin-recovery parachutes on six models of typical fighter and trainer airplanes were conducted in the Langley 20-foot free-spinning tunnel to obtain data for correlating model and full-scale results. Parachutes attached to the tail of the models, to the out wing tip (left wing tip for a right spin), to the inner wing tip, and to both wing tips were tested. The results indicated that parachutes of the same size and type were more effective as spin-recovery devices when they were attached to the outer wing tip in the spin than when they were attached to the tail. The diameter of the outer wing-tip parachute required for a 2-turn recovery by parachute action alone varied from 4 to 7 feet. Parachutes attached to the inner wing tip would not effect recovery. When parachutes attached to both wing tips were used for recovery, the parachute diameters required were of the same order as for tail parachutes. The diameter of the tail parachute required for a 2-turn recovery by parachute action alone varied from 6.5 to 12.5 feet for the airplane designs used.

Download or read book Space Shuttle Technical Conference Part 1 written by and published by . This book was released on 1985 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Wind Tunnel Testing of Small Scale Parachute Models and Comparison with Theory written by Sonia Gulbankian and published by . This book was released on 1994 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Technical Report on Vortex Ring Parachute Wind Tunnel Tests at United Aircraft Corporation written by David T. Barish and published by . This book was released on 1959 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt: The program consisted of testing of full scale parachutes in the 33 foot square settling section, and the measurement of the deployments of deceleration chutes in the 18 foot octagonal test section. Drag measurements on two versions of the Vortex Ring Chute 21.7 feet and 32.5 feet in diameter gave values of drag coefficient, more than 1.8 times that measured with a 28' diameter flat circular chute in the same test section. Correlations with small scale wind tunnel tests are also included. A large number of deployments of the 260" diameter drag chutes were conducted in the test section at speeds from 50 mph to 187 mph. Dynamic force measurements indicated rapid deployment, low shock factor and stable operation. A new pilot chute installation gave good deployment characteristics and stable operation.

Download or read book Dynamic Model Tests at Low Subsonic Speeds of Project Mercury Capsule Configurations with and Without Drogue Parachutes written by James S. Bowman and published by . This book was released on 1961 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1997 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Experimental Investigation of Personnel Parachute Designs Using Scale Model Wind Tunnel Testing written by Justin Barber and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: