This paper explores the application of the inside access concept to rear-entry upper torsos for surface EVA. The concept allows one arm to retract inside the suit, for hand access to head and for other purposes. Throughout the history of EVAs there has been some desire to be able to bring a hand inside; this has been possible only in the Russian Orlan suits since 1977 under some conditions. There are also examples of inside access in other settings such as underwater in atmospheric diving suits. With surface EVAs planned to be longer, more complex, and riskier there is a need for more in-suit capability. Taking advantage of the rear entry features, the concept modifies the backpack to create volume behind the hatch and torso on one side. One shoulder can move back to retract the arm and hand inside the torso. This allows hand access inside the helmet and in the volume in front of the shoulder and torso on that side. The basic design involves minimal changes to the main torso/scyes/sleeves or main suit systems. The inside access enables the wearer to deal with a variety of needs and problems inside the helmet; it may also open up possibilities for in-suit hand access for controls, adjustments and storage. The project includes development of a simple mockup to enable exploration of the design space. The paper presents a preliminary review of the concept application, with opportunities, concerns and limitations. It also explores sub-problems and possible solutions such as the best way to add in the new volume.
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