Fabman
Dances with Racecars
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Then all the chassis books I read as a pup growing up in this sport were wrong.I know that "rule of thumb" has been around for a long time. But as with many rules of thumb, the applicability of that "rule" never seems to show up. In this case, it's about rotating weight - more correctly rotational inertia - and I'm about 99% sure that it came out of the hotrodding side of the automotive hobby because 1:10 can't be justified through the physics and math involved. A 1 to 10 ratio might well apply to flywheel weight loss as an overall average up through the gears, due to the fact that they are being accelerated rotationally several times faster than the wheels.
I found at least a couple places that back my own rough 1:2 rule of thumb, which I've been able to verify via comparing acceleration simulations.
Norm
Silly me for believing it.