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I am currently designing a flywheel for a 745 KW engine inertia dyno.

Basically my design requirements are so:

Max RPM: 530 RPM (=55.5 rad/s)

Flywheel Diameter: 1.7 meters

Time needed to accelerate: 60 second (to max rpm)

I need help determining the mass of the flywheel.

My calculations and way:

Power=745 KW

ΔE=P*t=745*60=44700 KJ

Inertia for a solid disc (flywheel) = 0.5*m*r^2

Energy in flywheel = 0.5* (0.5*m*r^2)*ω^2

Isolate the mass:

m= (4*Energy) / (r^2* ω^2)= (4*44700) / (0.85^2*55.5^2) = 80 tons.

80 tons seems way off, I've gone over my calcs a few times and haven't found my problem.

I appreciate any assistance!

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# Flywheel design. Inertia dyno for 745 KW engine.

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