Q. about max acceleration, Planck's constant, PLUS: help locate Sci Am column (Amtr. Sci)

I read something indicating there is a maximum acceleration that
anything physically can take: a maximum G-force. I don't mean how
large objects will fall apart, I mean a max. G that even, say, a
single PROTON or NEUTRON will take. I think the author indicated that
exceeding this max will not cause a proton, say, to fall apart, but
just that the extra energy will be wasted and have no additional
accelerating effect. Apparently this has something to do with Planck's
Constant. Could someone tell us about this?

I understand the most rudimentary basics of Planck's Constant [and of
physics in general] ( constant = 6.26 joule-secs?), hv, etc. : it has
to do with the quanta: the discreet packets that energy consists of.
But I really don't remember what the author said and I cannot re-
locate the article.

That's my main question. But also: where I read this was a really
"cute" edition of the Amateur Scientist column in Scientific American.
A tongue in cheek essay, this was, and it was probably in a decades
old issue of Sci Am. I have researched this online and in university
library stacks and CANNOT find the Sci Am issue that had this column!
I emailed Sci Am about it and THEY couldn't help me locate it!

The column expressed the heartfelt desire of many of us for greater
advances in space exploration and related technology. With aplomb and
a "straight face," the author told the amateur how to build an
electromagnetic accelator capable of pushing heavy projectiles to near
light speed and send them off to other stars! He even listed specific
parts to buy from Radio Shack! The quantities involved would be kind
of budget-stretching, however! :-) It is in this article that the
constraints on maximum G-forces and Planck's Constant were mentioned.

Can anybody locate which issue of Scientific American this Amateur
Scientist column was in? It could have been from anywhere in the
nineties back to the sixties.
.

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