> And some microwave ovens these days have no turntable, so they'll
> take a square or rectangular container presumably making the unusable
> volume much less significant

But the ones that don't ......

> engine has always been 510cc

That's another fuzzy one. Bike engines always seem to hover just below
a "category" - 49cc, 247cc, 748cc, 999cc etc. Possibly has something to
do with displacement taxation. Might even be about home/export market
as to what the regs are. I remember being curious about it a long time ago
when a friend at school (in the UK) bought a James 200 (made in the UK),
197cc. Another friend's father had a vintage Ariel Square Four 1000,
995cc, so the "just under" has been around for a while. I guess if you're
the gumment and setting displacement limits you'll be forever chasing
rabbits as the manufacturers will always go just under

Joe


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