The M.Sc. thesis aims at the design and analysis of an innovative, ultrathin, low-cost reaction wheel prototype integrated in the primary structure of a 1U CubeSat. The wheel exceeds performances of present state-of-the-art and commercial reaction wheels for CubeSats, in terms of mass and volume, retaining competitive saturation momentum. The reaction wheel is integrated in one face of a 1U primary structure (termed “tile”) and thus the tile must satisfy CubeSat mechanical requirements (CubeSat Design Specification Rev. 13, 2014), which impose a maximum thickness of 6.5 mm above structure ribs, hence the ultrathinness requirement. The tile is composed of a stack of seven FR4 printed circuit boards, soldered together.