As alredy of published in the Journal of the Society of Agricultural Machinery in Japan in V. 16 and 17, we have reported the trials made by us on the Rotary Mower.
We have now tested on the efficiency and the power consumption of about 60 different types of horizontal and vertical plates of the Rotary Mower both in the field and in the laboratory. (Fig. 1 and Table 1.)
The equation showing the power required to move air of the rotary cutter is given below.
_??_=K(n/1, 000)β
n: R. P. M. of rotary cutter,
K: Coefficient. (See Table 2)
_??_: Power required to move air,
The following conclusion were made on the above study
(1) The circular type of arm required little power than the spiral arm or the straight arm.
(2) The increased power requirement was proportional to the diameter of the cutter and the height of the vertical plate.
(2) The power decrease was proportional to the number of arms.
On a field test of cutting Chinese Milk Vetch the following observations were made.
(1) The action of the cutter with the vertical plate is to cut and make windrows.
The peripheral speed of the cutter required 10m/s for cutting vetch, but this speed is not sufficent to make windrows.
(2) The ideal peripheral speed of harvesting vetch is about 15m/s.
(3) In comparing the action of the circular type of cutter with the spiral type having the same diameter, it was observed that the former required less speed and less power.
(4) It was also found out, that if the height of the vertical plate was more than 40mm, it was capable of doing better work.
A power test was carried out in harvesting of green soyabean and sweet potato vain.
The horse power requirement for harvesting the above two crops is given below, when the machine was found to be moving at 0.5m/s the horse power requirement was determined with the help of the DPM type Strainmeter.
(A) Power requirement for harvesting green soyabean 1.2_??_
(B) Power requirement for harvesting sweet potato vine 0.5_??_.
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