The objective of this research is to design and construction rotary
blade for reducing soil impacted-resistance forces. There are
three important portions of a rotary blade, namely lengthwise, tip
and holding blade portions. This paper presents how to design
prototype rotary blades. The lengthwise blade portion is designed
straight in order to simplify the production process. The tip blade
portion is designed for cutting and throwing soil. As well, it
contains slice angle to avoid every portion of the cutting edge
from impacting the soil surface at the same time. And it also
contains scoop surface to avoid the abrasion of blade’s outer
surface from the soil, hence reducing the soil resistance. In
experiment, slice angles of 10°, 15°, 20° and 25° are designed in
order to determine the relationship between the impacting forces
with slice angle and the rotational angle of rotary shaft. Four
prototype blades with different slice angles are then tested on the
testing set EOR (Extend Octagonal Ring) composing of a moving
soil bin and a stationary rotating rotary shaft. The experiment’s