Abstract: In a tillage device having first and second plow assemblies mounted in parallel relation on a main frame to thereby cut furrows in the soil creating soil strips in so doing and depositing the soil strips on a berm between the furrows created by the plow assemblies and having a rearwardly located plow assembly for moving the soil under the berm outwardly into the first and second furrows thereby creating a middle furrow and allowing the soil on the berm to fall into the middle furrow.

Abstract: A moldboard plow apparatus having alternate and cooperating moldboards or so-called "scoops". The first of the moldboards digs out and lifts a first soil section from a ground surface thereby forming a first furrow or so-called "cut". The second moldboard or so-called "scoop" cuts and lifts a second soil section thereby forming a second furrow, parallel to and usually adjacent to the first furrow. The moldboards are shaped such that a rearward movement of the soil sections on the respective moldboards causes the soil sections to be inverted and thrown from the moldboards into the opposite furrow in an upside-down condition. Thus the first soil section is thrown into the section furrow and the second soil section is thrown into the first furrow.

Abstract: A propeller or impeller construction having a plurality of blades mounted on a hub section. The blades are essentially triangular in cross section and are hollow to achieve light-weight and permit center air flow. In addition, the blades may be tapered in such manner that accelerated internal air movement with compression toward the tip ends is enabled. The tip portions of the blades may be vented to provide for air flow through the center and out of the tips, and also the rear structural plate may be vented to the low pressure side of the blades. Blade construction may provide for variations in the pitch angle. The blades are mounted on the hub section by a unique construction which may provide both commonality and interchangeability of parts. This construction also enables the use of shims to facilitate balancing and to change and/or adjust thrust characteristics without changing blades.