نتایج جستجو برای: sail sign
تعداد نتایج: 56813 فیلتر نتایج به سال:
There may be differences between this version and the published version. You are advised to consult the publisher's version if you wish to cite from it. The oscillating sail is a novel solar sail configuration where a triangular sail is released at a deflected angle with respect to the Sun-direction. As a result, the sail will conduct an undamped oscillating motion around the Sun-line due to th...
Solar sails employ a unique form of propulsion, gaining momentum from incident and reflected photons. However, the momentum transferred by an individual photon is extremely small. Consequently, a solar sail must have an extremely large surface area and also be extremely light. The flexibility of the sail then must be considered when designing or evaluating control laws. In this paper, solar sai...
The electric solar wind sail (E-sail) is a new type of propellantless propulsion system for Solar System transportation, which uses the natural solar wind for producing spacecraft propulsion. This paper discusses a mass breakdown and a performance model for 5 an E-sail spacecraft that hosts a scientific payload of prescribed mass. In particular, the model is able to estimate the total spacecraf...
NASA has been considering a solar sail that would accelerate a craft to a high velocity (∼14 AU/yr) by the time it reached 5 AU. Then the sail would be dropped and the craft would coast alone to deep space. We propose that the sail be retained longer. Then the density of the interplanetary medium could be determined by measuring the drag force on the huge sail using radiometric navigational dat...
This paper presents results from a Computational Fluid Dynamics (CFD) based parametric design study of two-dimensional downwind sail sections. By varying draft and camber a range of sail shapes are generated that cover the typical range of an America’s Cup Class (ACC) downwind sail inventory. In order to reduce simulation times only a solitary downwind sail is used, i.e., the influence of the m...
An assessment is presented of a Solar Polar Orbiter mission as a Technology Reference Study. The goal is to focus the development of strategically important technologies of potential relevance to future science missions. The technology is solar sailing, and so the use of solar sail propulsion is, thus, defined a priori. The primary mission architecture utilizes maximum Soyuz Fregat 2-1b launch ...
T the time of the Great European Excursion in the sixteenth century, the sail known as the lateen was in use in three different regions of the world. In the orthodox view, its existence and distribu-tion are a matter of importance for several reasons. First, sails as an artifact have not demonstrated very great human inventiveness, and since the lateen requires some ingenuity to conceive, its d...
Spacecraft kinematics, peak perihelion temperature and space environment effects during solar-radiation-pressure acceleration for a beryllium hollow-body interstellar solar sail inflated with hydrogen fill gas are investigated. We demonstrate that diffusion is alleviated by an on-board fill gas reserve and electrostatic pressure can be alleviated by increasing perihelion distance. For a 0.1 AU ...
The electric solar wind sail (E-sail) is a space propulsion concept that uses the natural solar wind dynamic pressure for producing spacecraft thrust. In its baseline form, the E-sail consists of a number of long, thin, conducting, and centrifugally stretched tethers, which are kept in a high positive potential by an onboard electron gun. The concept gains its efficiency from the fact that the ...
Solar sailing is an enabling technology for many mission applications. One potential application is the use of a sail as a communications relay for a base at the lunar south pole. A survey of the design space for a solar sail spacecraft that orbits in view of the lunar south pole at all times demonstrates that trajectory options are available for sails with characteristic acceleration values of...
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