The low-Earth orbital deployment of the composite boom solar sail is the main goal of the ACS3 technology demonstration. The ACS3 spacecraft will unfold its solar sail via four booms that span the square's diagonals and unspool to a length of 23 feet, or around 7 meters, when it has reached space and deployed its solar power arrays. When the solar sail is fully extended, it takes around 25 minutes. The square-shaped solar sail is about the size of a small apartment and measures about 30 feet (or 9 meters) on each side. In order to evaluate the sail's shape and alignment, a set of onboard digital cameras will take pictures of it both during and after deployment.