Ernest Christley wrote:
Jim Weir wrote:

I've come across a marvelously cheap vibration sensor that I want to
convert
into an engine vibration instrument for a Kitplanes article. The
electronics
for me is relatively trivial...the mechanics of vibration are a little
harder to
fathom.


Jim,

I was reading an article on the NASA LARC website which discussed
flutter detection techniques. Would it be possible to tag the ailerons
with a couple of these babies, then add a "pull-power-and-pull-up" buzzer?


I'm sorry. I didn't give quite enough information as to why the
vibration sensor would be beneficial.

The study was a review of techniques used to generate flutter. It seems
to be a well known fact amoung the engineering types that it is fairly
easy to detect the onset of flutter. The vibration is fairly steady
state and random, and just before flutter sets in the vibration begins
to diverge logritmically (I know that ain't spelt rite).

A circuit with a sort of squelch mode would be very useful, especially
during initial flight testing.

--
http://www.ernest.isa-geek.org/
"This is by far the hardest lesson about freedom. It goes against
instinct, and morality, to just sit back and watch people make
mistakes. We want to help them, which means control them and their
decisions, but in doing so we actually hurt them (and ourselves)."