Fundamental Studies for the Development of a High Speed Japanese Plow (II)

Development of a High Speed Japanese Plow Shape

Abstract

In search for the design principle of high speed Japanese plows, the author tried to develop the formulae to convert a conventional Japanese plow shape into high speed one with the assumption of the equal acceleration of furrow slice sidewards as well as upwards.
Then a high speed Japanese plow shape was calculated and constructed. Field tests on the turning performance of furrow slice and on the resistance were carried out.
The main results are the followings.
1) Using the formulas of the relationship between the moldboard shape and the path of furrow slice as well as the assumption of equal acceleration, the formulae (27), (28) and (29) for the conversion of a conventional low speed Japanese plow shape into high speed one were introduced.
2) Calculating the profile lines of the high speed Japanese plow with above equations, a moldboard shape for high speed was constructed.
3) The developed high speed Japanese plow shape was smoother and with less change of profile slope in α and β lines. The γ lines had, however, the opposite characteristics.
4) The results of the field tests showed that the developed high speed Japanese plow had just so good turning performance of furrow slice as conventional low speed Japanese plow.
5) The resistance force to the high speed Japanese plow was, however, considerably larger than that of the conventional low speed one. The reduction of the resistance must be achieved in the future.