Interesting story! Sounds like your version of an
inertial drive...early experimenters Dean, Japolsky,
Laithwaite, more recently Cook, Thornsen and a couple
of latecomers Cowlishaw and one other whose name I
don't recall.
One story says Dean actually made something that
ascended off the ground for a brief period using the
'jerk drive' principle.
I thought that was interesting where Laithwaite
remarks on the extreme torques that the drive would
suffer as well as its relationship to the frame and
his way to cancel it but still achieve thrust.
Much about vibration we don't know (though we think we
do, cocky humans that we are..<g>..). I found an
interesting patent for an ultrasonic motor that uses a
travelling wave tube to push wheel with flexible
teeth.
The waves apparently push against one tooth at a time
which bends to impart rotation to the wheel. Then the
tooth returns to its normal position until it again
arrives at the point where the wave strikes it.
Totally fascinating, check out;
USPTO
http://164.195.100.11/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=/netahtml/search-bool.html&r=5&f=G&l=50&co1=AND&d=pall&s1='ultrasonic+motor'&OS="ultrasonic+motor"&RS="ultrasonic+motor"
I tried it on Womplex but couldna find...
There was a guy back in the late 60's or early 70's in
Lubbock, Texas who had connected a big dual tined
tuning fork into an 18" model car.
The fork was excited by a coil wrapped around the
handle and links were attached to the tines. When the
coil was driven at the resonant frequency of the fork,
the vibrating forks would drive the model car. It was
a very exciting report in a tabloid paper with a
picture which I have somewhere.
A few months later, I read in the same paper that the
guy had been paid something like 3 million bucks to
sell his secret to an oil company and keep his mouth
shut.
Seems like that would be a great experiment to play
with...hmm, I have some tuning forks around here
somewhere that I'd be willing to sacrifice in the name
of weird science...
--- Marinus Berghuis <renkahu@ihug.co.nz> wrote:
> At 09:20 25/10/1999 -0700, you wrote:
> >Hi John et al!
> >
> I once built a vibrator with 2 13 lbs weights
> rotating in opposition to each other but not like
> the ones used in pile hammers. I hinged the weights
> in such a way that they worked together only at one
> point to slide away like a comet goes round the sun.
> about 60 revs a minute creates enough thrust with
> 1/4 h.p. motor to make it scoot along the bench and
> crash into the wall with a hell of a force. I
> intended to use it in a boat because when in a
> rowing boat, you can make the boat move with your
> body weight providing you shock your body forward
> and slowly return to it's original position.
> Any positive action can be sustained as long as the
> reaction can be slowed down sufficiently to
> minimise the backlash in time.
>
> Greetings
> Ren
=====
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