Abstract: A rocket in one example includes separate chambers for storing two thrust grains: an initial thrust grain and a boost thrust grain. The initial thrust grain is stored in a first chamber and the boost thrust grain is stored in a second chamber. The initial thrust grain is ignited separately from the boost thrust grain, such as in a two-stage process where the initial thrust grain is ignited before, or at the same time as, the boost thrust grain. The initial thrust grain has a large surface area (different burn pattern) relative to the boost thrust grain, which causes the initial thrust grain to have a shorter burn time than the boost thrust grain.

Abstract: A folding wrench cluster may include at least four wrenches of different sizes and/or configurations, each selectively extendible from a single body portion. The body portion comprises a flat plate with a wrench secured to a pivot point extending from each side at each end of the body. The pivot points are laterally offset from the longitudinal centerline of the body. A laterally offset stop pin also extends from each side at each end of the body, with the stop pins being opposite the wrench pivot points. The stop pins are positioned to limit the arcuate motion of the wrenches when they are unfolded, so each wrench is closely aligned with the elongate body plate when it is fully extended, with the body plate serving as an extension handle. Spacers are provided between adjacent body plates or retaining members, to allow for a relatively thick wrench head for greater durability for the tool.