The study results of the characteristics of winter wheat variety ‘Dmitry' to substantiate parameters and regimes of stripping reaper work
It's necessary to know more than ten physical-mechanical characteristics including height, weight and strength of plants and their parts to design and work on the harvesters stripping plants under roots. The former conducted researchers of various winter wheat varieties show, that their physical-mechanical characteristics are greatly different, e.g. the length of a stem and its diameter of the studied variety ‘Dmitry' is 0.8m and 3.65mm respectively, while the length of a stem and its diameter of the variety ‘Grom' is 0.545m and 3.2mm respectively. Due to various geometric characteristics of the compared varieties the stem cutting force of the variety ‘Grom' was 2.29 kG, that is on 1.35 less than that of the variety ‘Dmitry'. Intravarietal variations of physical-mechanical characteristics of the winter wheat plants are of great importance as well. The variation of stem length of the winter wheat variety ‘Dmitry' is of 0.35-1.25m, the angle of its bending to fracture is of 29.26<sup>0</sup>-74.74<sup>0</sup>. The size and aspect ratio of plant characteristics have a great effect on the mutual arrangement of the fairing and the stripping drum and the position of the reaper against the field surface. The values of the coefficient of friction of the heap components along the working surfaces of the stripper as well as the coefficient of grain recovery influence upon the speed of its detachment from the ear, the trajectory of motion in the transport channel, and, ultimately, the quality of the whole process. That's why their study is of great importance.