ClueLuma

Flywheel energy ratio calculator

For unchanged inertia, stored kinetic energy is proportional to rotational speed squared.

rE=(n2n1)2r_{E} = \left(\frac{n_{2}}{n_{1}}\right)^{2}

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

rpm
rpm
ratio

Worked example

Given

  • n2n_{2} = 18,000 rpm
  • n1n_{1} = 24,000 rpm
rE=(18,00024,000)2=0.5625r_{E} = \left(\frac{18{,}000}{24{,}000}\right)^{2} = 0.5625

Symbols and units

SymbolMeaningUnit
rEr_{E}kinetic energy ratioratio
n2n_{2}final rotational speedrpm
n1n_{1}initial rotational speedrpm

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Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.