Abstract
Deorbitsail is a Seventh Framework Program (FP7) mission to demonstrate drag deorbiting via deployable sail. Deorbitsail will be a small satellite with a complete communications bus and three-axis attitude control. The satellite is subject to the 3U Cubesat standard and uses four deployable booms to unfurl four triangular sail segments. These segments will form a 5-by-5-metre square, which will be used for drag deorbiting. Three-axis attitude control will keep Deorbitsail pointed in the direction that maximizes drag. Depending on orientation, the stowed Deorbitsail Cubesat will have a frontal area of between 0.01 and 0.07 m2. With the sail deployed, the area will increase to slightly less than 25 m2.