A rotavator has rotor radius300 mm, six flanges and three blades per flange acting in one plane. Initially rotor speed 180 rpm and forward speed 3 km/hour. Both speeds increase15%. Find the change in soil-slice length in integer mm.
Soil-slice length is forward advance per successive blade action,$l=v/(zn)$ using consistent time units. Blade count z is unchanged, and both v and n are multiplied by 1.15. Their ratio is therefore unchanged: $l_{new}/l_{old}=1.15/1.15=1$. The change is **0 mm**,independent of rotor radius.
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