fig4 an angular piece of sheet metal indicated at 57 and having a first leg and a second or lower leg is welded to a flat plate 58 to form a triangular cross section the flat plane extends somewhat beyond its junction with the angular plate 57 as shown at 59 and the lower leg of the angular member 57 as shown in fig4 extends beyond the plate 58 to form a flange 60 to which the angular extension 61 is secured by bolts and nuts as indicated at 62 as can be seen from fig2 and 3 the upper end of each blade is affixed to the outer periphery of the ring 50 with the first leg of the angular member 57 adjacent the ring and the body of the blade projecting outwardly therefrom at the lower end of each blade the angular plate 57 intersects the circular plate 39 with the extension 61 projecting outwardly beyond the periphery thereof in operation it is preferable that the rotor be turned at the rate of approximately three hundred revolutions per minute with a rotor of about five feet in axial length and an average diameter of approximately six feet this rate of rotation will require seventy five to a hundred horsepower when used in an orchard area the top of the rotor should be positioned fifteen to twenty feet above ground to produce the most desirable draft pattern and to assure an element of safety so that no one is likely to be be injured from contact with the moving components under present practices fruit orchard trees are pruned so that they are approximately twenty feet high which results in the rotor being placed so.