reaching from the world’s smallest commercial reaction wheel RW 1 (10-4 Nms) to the RW 250 (4 Nms). The reaction wheels RW 90 and RW 1 are already flight proven. Four reaction wheels RW 90 come into operation at the small satellite TET-1 (launch in 2012).  State of the art feedback systems in combination with model based controller algorithms making smart reaction wheels the ideal solution for zero-momentum attitude control strategies because these reaction wheels will operate with high accuracy as well in the “low wheel speed region”. Astro- und Feinwerktechnik Adlershof GmbH