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  • Other Sources  (2)
  • AERODYNAMICS  (1)
  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE  (1)
  • Chemistry
  • 1
    facet.materialart.
    Unknown
    Mutual downwash interference effects on the normal force and roll driving coefficients of multi-stage rockets (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: For several years, the TAD2 computer program has been used to calculate the aerodynamic properties of sounding rockets. This program was limited, however, in that a maximum of two fin sets could be accommodated analytically. In addition, the roll moment coefficients did not consider downwash effects. Techniques are developed and equations derived for the expansion of capability to include three fin sets. The effects of downwash on the roll moment coefficients are also treated analytically for two and three stage rockets.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 86-2528
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    Development of a reaction wheel attitude control system for sounding rocket experiments and small Shuttle-based free flyers (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A three-axis reaction wheel control system is currently under development. Initial emphasis is on a magnetic field reference, although the system is easily adaptable to other positional references, e.g., the gyroscopic. The system is housed in a skin section 17.25 inches in diameter and approximately 10 inches long. Current weight estimate is 75 pounds. An orthogonal triad of dc motors forms the basis of the system. Power is provided by silver-zinc cells and controlled by an 8-bit microprocessor. The control law is presented and the dynamical equations derived. Simulation results show that a payload with a roll MOI of 4.1 sl/sq ft and a transverse MOI of 20.3 sl/sq ft can typically be reoriented 90 degrees in 20-35 seconds, depending upon the initial body rates.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AIAA PAPER 86-2521
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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