In using the two-way plow, it is found advantageous to work by the succesible or cycloidal plowing method in the central part of the field, and by the additional plowing method in the head-land. In this case, as mentioned in report 6, the turning time of the tractor will be somewhat longer than an expected value from a calculation by slowing down the turning speed and by some other reasons.
An experiment was carried out in a square land setting the two-way plow of 16 in, width onto the tractor, which is shown in table 1, and efficiency curves of plowing methods resulted from the experiment are shown in figure 2. It will be seen from the figure that efficiency of the cycloildal plowing is generally about 2.5% higher than that of the succesible plowing method. Moreover, efficiency curves of both cycloidal and succesible plowing methods are less than 50% in small area, while they raise quadratically when area becomes larger, approaching 90% in the largest area. Interrelationship between plowing widths and the efficiency of both cycloidal and succesible plowiing methods appears constant. Table 2 is the results of calculations for the relationships.
Capacities of the two-way plow are shown in figure 3. They were obtained multiplying plowing widths by plowing speeds and using efficiency values mentioned above.
In the figure, we can see a tendency that the wider the plowing width the higher the capacity, and a remarkable increase of the capacity when area becomes larger. Therefore, in an actual case, it would be better to broaden the width of the plow as much as, possible considering ability of the tractor and the field condition. In the two-way plow, however, as the weight would be doubled comparing with a one-way plow, there is certain limitation in setting such a broadened plow. Consequently, if there is no special require, reversible plow of the normal type, except for the front-rear symmetry reversible type noted in report 8, would not be efficient.
View full abstract