ティラーに関する2・3の実験

Experiment of the tiller was conducted to find out by means of field tests the performance of tilling, using five types of rotor. Two types of rotor were named “Hanagata” and “Nataba” made at the tiller manufacturer, and three types of rotor were designed at the College in such a way that the cutting angle of tines were respectively 30°, 45°, 60°. The performance of tilling of the tiller differed much from that of conventional power tillers. The results of test were as follows:-<br>1. As the depth of tilth increases, the power requirement of tiller increases at beginning and then tends to decrease at about the tilth of the deeper limit.<br>2. As the depth of tilth increases, the running speed and tilling pitch of tiller drops lower and pulverizing characteristics are improved.<br>3. The power torque required for unit volume of tilth per sec. was the smallest for the rotor attached with the tines of 60° cutting-angle. Through other field experiments, it was found that the draft requirements of the tiller mounted with the water-cooled engine were larger than that of the tiller with the air-cooled engine. The stability performance of the tiller with water-cooled engine was as same as that with air-cooled engine on the flatted land, but on the sloping land it was hard to operate the tiller with water-cooled engine. The straines caused by vibrations of water-cooled engine seemed slightly smaller than that of air-cooled engine.