Abstract
The Solar Sail “IKAROS” (Interplanetary Kite-craft Accelerated by Radiation Of the Sun) , which is the first solar sail on orbit, consists of 20m diagonal length square membrane made of 7.5μm thickness polyimide film. The sail membrane is deployed by centrifugal force due to spinning motion of the spacecraft. The wrapping fold is applied to realize stable deployment property. The manufacturing process of the large membrane with the folding techniques are described in detail.
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