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What
is a
the difference between a "brake" type
dyno, and an "inertia or inertial" Dynamometer?
A Brake type
dynamometer measures power by "braking" the drum or roller
(or the engine in an engine dynamometer directly).
t then uses a load cell or spring
balance to measure the torque required to hold the engines
RPM steady. Now, Torque x RPM = Power so we have the
power!
An inertia dyno,
(shown) uses a heavy solid steel drum, and no brake! The
drum is free to accelerate. A computer logs the rate
of acceleration, and as it knows the mass of the drum, it
can plot the power required against either road speed, or
real time engine RPM.
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