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Spacecraft kinematics, peak perihelion temperature and space environmenteffects during solar-radiation-pressure acceleration for a berylliumhollow-body interstellar solar sail inflated with hydrogen fill gas areinvestigated. We demonstrate that diffusion is alleviated by an on-board fillgas reserve and electrostatic pressure can be alleviated by increasingperihelion distance. For a 0.1 AU perihelion, a 937 m radius sail with a sailmass of 150 kg and a payload mass of 150 kg, perihelion sail temperature isabout 1000 K, peak acceleration is about 0.6 g, and solar-system exit velocityis about 400 km/s. After sail deployments, the craft reaches the 200 AUheliopause in 2.5 years, the Sun's inner gravitational focus at 550 AU in about6.5 years and 2,550 AU in 30 years. The Be hollow-body sail could be applied inthe post 2040 time frame to verify general relativity predictions regarding theSun's inner gravitational focus and to explore particles and fields in theSun's inner Oort Comet Cloud.

The beryllium hollow-body solar sail: exploration of the Sun's gravitational focus and the inner Oort Cloud