Strut Tower Brace Design Revisited
sidman at montereynet.net
Mon Feb 28 13:27:09 EST 2005
Bernie: It appears there is some confusion and/or
disagreement surrounding what the tower is doing, what the
strut is doing, how they share dampening through the rubber,
etc. Bottom line is, your idea to tie the strut tops
together does produce beneficial results, to which a number
of us can gratefully attest.
My point is that the loading on the brace is dynamic, not
static, and the generally accepted physics principal that
for every action there is an equal and opposite reaction
tells me that the strut cannot be loaded without there being
an unloading moment. In other words, pressure pushing the
towers apart. That back and forth movement, however slight,
is what introduces metal fatigue. The solidly connected bar
prevents that for the strut, and helps reduce the effect of
whatever the springs are doing to the towers. I am hoping
that the solid brace reduces those stresses enough to keep
the wheels parallel and the towers from getting romantic.
And it all appears to work.
Cost wise - total was $110, and a bargain for what it does.
Weight wise - I could diet for a few days and make up the
Clearly, there is no definitive answer, short of dusting of
my long forgotten structural engineering books and working
out the numbers. Anyway, we do this because it's fun and how
else do we entertain list members?
GEORGE SIDMAN, Chairman
sidman at webloq.com
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