Recent discussion on extractor speeds prompted me to look up
something I wrote (in 1981!) on spinner speeds.  To compare
different spinners (or extractors) it isn't enough to simply work
out the radial speed, but you need to calculate the g-force at the
rime as some contributors have pointed out.
 
The force at the drum (or RCF: relative centrifugal force) is
proportional to the radius of the drum (or baskets) and the
rotational speed squared.  The formula is RCF equals the
radius in millimetres times the square of the rotational speed in
revolutions per minute, both divided by 90,000.
 
For example, a spinner (or extractor basket) of radius 600 mm
rotating at 200 rpm will exert of force of 27 g or 27 time the force
of gravity (26.67 actually).