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Message
[Maybe it will just be for a second while you go through this or
that RPM. Or
(with my luck) it will be for hours on end while you try to make
it to
Sun&Fun. The amount of movement induced into the cooler may be
nearly undetectable.
Just holding on lightly and revving the engine may show
it off. Maybe not. Some
airplane engines cannot use some props because of
this.]
Hi again
Lynn,
Thanks, as always for
the comments. I hope you're not getting carpel tunnel from all this typing
:-) I understand the principal of harmonics, and agree that there
are no end to the variables that determine the offending frequency. For
example, say you construct a perfect isolation from the engine, then the
airflow through the core shakes it at a critical frequency (which would be
my luck btw). I just don't think there's any way to know what will
happen without testing it.
I'm going to keep
thinking about this, and would still like to see pics of other peoples evap
mounts (thanks also to Jim and his funny firewall). I can
think of a couple ways to add some isolation to the cores, without changing
their location, so I can proceed with the current hard mounts, at least through
ground testing. I'd like to see if I can get any indication of
whether they will have a problem before I change it all.
Thanks
again,
Rusty (stubborn, slow
learner)
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