Study of fluidic roll control for sounding rocket applications
Fluidic roll control for Aerobee rocket vehicle
Keltz, W. L.↗
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Roll-control effectiveness, of several spoiler configurations on an airplane model with wing sweep of 55 deg and 75 deg at supersonic Mach numbers
Roll-control effectiveness of spoiler configurations on aircraft model with variable sweep wings at supersonic speeds
Hayes, C.↗
Effect of contact angle on rolling-element fatigue life with a fluorinated ether lubricant at a cryogenic temperature of 170 K /305 deg R/
Test of rolling element fatigue life with fluorinated ether lubricant at cryogenic temperature using five ball fatigue tester
Dietrich, M. W.↗
Elastohydrodynamic film thickness between rolling disks with a synthetic paraffinic oil to 589 K /600 F/
Elastohydrodynamic film thickness between rolling disks with synthetic paraffinic oil at temperatures from 339 to 589 K
Kannel, J. W.↗
Analysis of a coupled roll spiral mode, pilot induced oscillation experienced with the M-2F2 lifting body
Analysis of coupled roll-spiral-mode, pilot induced oscillation occurring with M-2F2 lifting body
Kempel, R. W.↗
Single-degree-of-freedom roll response due to two-dimensional vertical gusts
Single degree of freedom roll response due to vertical random two dimensional vertical gusts
Houbolt, J. C.↗
Rolling-element fatigue and lubrication with fluorinated polyethers at cryogenic temperatures
Rolling ball fatigue and lubrication with fluorinated polyethers at cryogenic temperatures compared to superfined mineral oil
Dietrich, M. W.↗
A statistical analysis of the roll rate of a launch vehicle under the influence of random fin misalinements
Launch vehicle under influence of random fin misalignments, predicting roll rate by statistical analysis
Madden, R. B.↗
Evaluation of otolith organ function by means of ocular counter-rolling measurements
Ocular counter-rolling as otolith organ function indicator
Miller, E. F., II↗
An exploratory study of the roll behavior of ablating cones
Cone roll dynamics-ablation patterns coupling in hypersonic wind tunnels
Mcdevitt, J. B.↗
Roll function in a flight simulator
Method introduces roll into the flying-spot scanner by modifying the scanning waveforms.
Brain, A. E.↗
The development, design and test of a 66 W/kg (30-W/lb) roll-up solar array
A program to develop a 250 square foot roll-up solar array with a power-to-weight ratio exceeding 30 watts per pound is described. The system design and fabrication of a full scale engineering development model are discussed. The system and development test program results are presented. Special test equipment and test procedures are included, together with comparisons of experimental and analytical results.
Hasbach, W. A.↗
Roll-modulated lifting entry optimization.
Equations of lifting entry are considered for fixed-angle-of-attack vehicular motion with path control for roll modulation of lift. Attention is directed to relocation and its consequences for the fixed-angle-of-attack atmospheric entry problem. Two reduced-order methods for working with the resulting system of equations are briefly examined. The methods are deemed to warrant further study.
Kelley, H. J.↗
Improved diffusion welding and roll welding of titanium alloys
Auto-vacuum cleaning technique was applied to titanium parts prior to welding. This provides oxide-free welding surfaces. Diffusion welding can be accomplished in as little as five minutes of hot pressing. Roll welding can be accomplished with only ten percent deformation.
Holko, K. H.↗
Carbide factor predicts rolling-element bearing fatigue life
Analysis was made to determine correlation between number and size of carbide particles and rolling-element fatigue. Correlation was established, and carbide factor was derived that can be used to predict fatigue life more effectively than such variables as heat treatment, chemical composition, and hardening mechanism.
Chevalier, J. L.↗
Analysis of electrical contact occurrences between rolling surface with application to elastohydrodynamic lubrication
A mathematical model enabling the relation of electrical contact occurrences between rolling surfaces to the mean thickness of an elastohydrodynamic lubricant film is discussed. A previous development by other authors is shown to contain an error invalidating their results. Some potentially useful approximations are developed for the case when the lubricant film is large with respect to the surface roughness. Complete solutions that are valid for all film thicknesses are not yet available.
Sidik, S. M.↗
On the inviscid rolled-up structure of lift generated vortices
A simple form is presented of the relationships for the inviscid, fully developed structure of lift-generated vortices behind aircraft wings. The method is then extended to arbitrary span-load distributions by inferring guidelines for the selection of rollup centers for the vortex sheet, along with rules for calculating the fully developed structure of the resulting multiple vortices. These techniques yield realistic estimates of the rolled-up structure of vortices produced by a wider variety of span-load distributions than possible with the original form of the theory.
Rossow, V. J.↗
Design and development of LH2 cooled rolling element radial bearings for the NERVA engine turbopump. Volume 3: Phase 2: Tests on build-ups 16, 17, and 18 at NRDS, Jackass Flats, Nevada, December 1971 - March 1972
The use of liquid hydrogen to cool the rolling element radial bearings in the nuclear engine for rocket vehicles is discussed. The fifteen hour service life goal was obtained during the tests. The increase in bearing life was also considered to be produced by: (1) improvements in bearing material, (2) bearing retainer configuration and manufacturing changes, and (3) better control of operating parameters.
Accinelli, J. B.↗