A tractor PTO operated 4 -disc rotary mower is harvesting with a forward speed of $3.5 \mathrm{~km} \mathrm{~h}^{-1}$. The cutting circle diameter and rpm of each disc are $60 \mathrm{~cm}$ and 1400 , respectively. The peak cutting force experienced by each rotary disc is $110 \mathrm{~N}$. The peak overall motion resistance is found to be $3.6 \mathrm{kN}$. If the overall power conversion efficiency of the tractor is $82 \%$, required peak engine brake power in $\mathrm{kW}$ will be_____________

A tractor PTO operated 4 -disc rotary mower is harvesting with a forward speed of $3.5 \mathrm{~km} \mathrm{~h}^{-1}$. The cutting circle diameter and rpm of each disc are $60 \mathrm{~cm}$ and 1400 , respectively. The peak cutting force experienced by each rotary disc is $110 \mathrm{~N}$. The peak overall motion resistance is found to be $3.6 \mathrm{kN}$. If the overall power conversion efficiency of the tractor is $82 \%$, required peak engine brake power in $\mathrm{kW}$ will be_____________

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