Deployable boom

 

The deployable boom developed for the SEAM project is unique in that is simultaneously deploys two cantilevering booms with tips of approximately equal mass. The boom design is inspired by the SIMPLE boom developed by Thomas Murphey and uses two counter-rotating spools with coiled bi-stable tape springs. The tape springs are made of four layers of very thin glass fiber fabrics. The harness is accommodated on separate spools that deploys with the tape springs. The size of the complete stowed boom is 100x95x80 mm^3. A picture of an early prototype boom hanging in a gravity off-loading system is shown below.