Abstract: A portable ice fishing shelter for providing an enclosed and expandable structure for ice fishing within. The ice fishing shelter generally includes a rigid primary enclosure having sidewalls, a roof, and a base to form a first interior space, wherein the base forms an inverted U-shaped raised center portion to accommodate a seat within and allow for smoother pulling below. The primary enclosure also has a side opening extending through at least one of the sidewalls for a rigid extendable enclosure. The extendable enclosure includes an open bottom and extends from a perimeter of the side opening and is movably connected thereto. The extendable enclosure is adapted to move between a refracted position during storage or transport and an extended position during use, wherein a second interior space is formed to accommodate one or more angling holes. A tow hitch and glide members may also extend from the primary enclosure.

Abstract: The invention relates to a method for, in a hydrostatic transmission having a preferably variable displacement hydraulic pump (P) feeding a number of hydraulic motors (M1, M2, M3, M4) provided in association with respective drive wheels, drive tracks or corresponding drive apparatus, mutually balancing the flow of hydraulic fluid through the different hydraulic motors (M1-M4) by individually controlling of the flow from and/or to the same, whereby the individual flows of hydraulic fluid through the respective hydraulic motors (M1-M4) are detected and compared across respective restrictions (14, 15) being variable dependent on the total flow but being of mutually equal size and whereby, for optimum control or balancing, the detected differences in flow through the different hydraulic motors are in themselves used directly for the balancing.