In a band and block brake, the ratio of tensions on the tight and slack sides of band is given by (where μ = Coefficient of friction between the blocks and the drum, θ = Semi-angle of each block subtending at the centre of drum, and n = Number of blocks)
1
\(\frac{T_1}{T_2}=\mu \theta\;\times n\)
2
\(\frac{T_1}{T_2}=(\mu \theta)^n\)
3
\(\frac{T_1}{T_2}=\left(\frac{1\;-\;\mu\tan \theta}{1\;+\;\mu\tan \theta}\right)^n\)
4
\(\frac{T_1}{T_2}=\left(\frac{1\;+\;\mu\tan \theta}{1\;-\;\mu\tan \theta}\right)^n\)
5
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