Alt-BEAM Archive
Message #07323
To: beam@sgiblab.sgi.com
From: Jaroslav 'Lord Slayer' Pelan [mailto:pelanj@feld.cvut.cz]
Date: Wed, 3 Nov 1999 08:14:51 +0100
Subject: Re: aquabots - 'sealed' motor
hello,
> Depends. Some have gasses like Argon or Xenon in them (just to name a
> couple). Xenon is usually used for flash bulbs, though.
> Peace out!
but there has to be some sort of under pressure. When i used a
little torch and heated the bulb, the almost melted glass went into
the bulb and formed something like stalactite.
Sleep well ...
JP
The EviL DaRKloRd SlaYEr
7324 Wed, 3 Nov 1999 08:23:33 +0100 directional antenna? beam@sgiblab.sgi.com Evan Dudzik [mailto:evandude@yahoo.com]
does anyone have any ideas on how to build a
unidirectional antenna? this would be great for homing
in on RF signals... otherwise, i have another idea.
take three antennas, and place one in the center of
the bot... take the next two and place them at the
left and right sides of the bot. now, have a beacon
set up that transmits signals... it just has to
transmit a signal, wait for like a second, and then
trasnmit another... the robot will have its central
antenna on at all times, waiting for that first
signal. when it recieves it, it turns on the other
two recieving antennas... when the signal comes, it
will reach one antenna BEFORE the other because that
antenna is closer. The difference between times would
be REALLY short, so the bot would have to have some
quick detecting circuitry (TTL... isnt that really
fast? fast enough?) this whole thing is kinda how our
ears work, sound reaches one side before the other.
any ideas on circuitry? or whether this thing would
even work? it would be good to help a bot home in on
its charging station... or other uses. anyway,
thanks.
=====
+------------------------+
|http://surf.to/photovore|
|Photovores online! |
|Evandude Dudzik |
+------------------------+
__________________________________________________
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7325 Wed, 3 Nov 1999 08:26:21 +0100 Re: aquabots - 'sealed' motor beam@sgiblab.sgi.com Jaroslav 'Lord Slayer' Pelan [mailto:pelanj@feld.cvut.cz]
hello,
> Depends. Some have gasses like Argon or Xenon in them (just to name a
> couple). Xenon is usually used for flash bulbs, though.
> Peace out!
but there has to be some sort of under pressure. When i used a
little torch and heated the bulb, the almost melted glass went into
the bulb and formed something like stalactite.
Sleep well ...
JP
The EviL DaRKloRd SlaYEr
7326 Wed, 3 Nov 1999 08:31:04 +0100 Re: aquabots - 'sealed' motor beam@sgiblab.sgi.com Bob Shannon [mailto:bshannon@tiac.net]
Wouldn't it be a lot more efficient to drive a bimetalic strip attached to
a bellows?
Store up power, then activate the ballast bladder, change depth, then as the
strip recovers you return to your trimed depth.
Asking the heat of a light bulb to change the density of a gas sufficiently
to
displace enough water to matter is not an efficient process.
Benjamin Edward Hitchcock wrote:
> ----- Forwarded message from Wilf Rigter -----
> Using a light bulb to change buoyancy won't work since buoyancy is
affected
> by the displacement of water with a volume of lower density. So the rigid
> glass bulb is the problem. A bladder filled with an incompressible
substance
> which changes volume and density as it is heated should work.
>
> alright!
>
> ---
>
> I love it! Using a lightbulb to change buoyancy! Fantastic! There is a
> way to do this - put a partially inflated balloon around the lightbulb.
> This will make the whole assembly watertight as well, and make a cool
> coloured 'glow' when the device is on. Maybe you could use a magnetic
> coil on the bottom of the cylinder attached to the mains, and have another
> coil on the bottom of your bot. This would charge up a capacitor, and
> coupled to a solar engine would make the bot sit on the bottom chanrging
> up, then light its 'engine' and drift up to the stars!
>
> VERY elegant.
>
> Nice idea!
>
> Ben
7327 Wed, 3 Nov 1999 08:34:28 +0100 Re: [alt-beam] Re: aquabots - 'sealed' motor alt-beam@egroups.com michael.hirtle@ns.sympatico.ca
If u have problems with alge u could get a alge eater and put it in the tank
with your bots, but the bot may kill the fish
Wilf Rigter wrote:
> There was a post not long ago of a sub-bot that used wax heated through
it's
> solid/liquid phase to change the buoyancy.
>
> Wilf Rigter mailto:wilf.rigter@powertech.bc.ca
> tel: (604)590-7493
> fax: (604)590-3411
>
> > -----Original Message-----
> > From: Bob Shannon [SMTP:bshannon@tiac.net]
> > Sent: Tuesday, November 02, 1999 4:27 PM
> > To: beam@sgiblab.sgi.com
> > Subject: Re: aquabots - 'sealed' motor
> >
> > Wouldn't it be a lot more efficient to drive a bimetalic strip attached
to
> > a bellows?
> >
> > Store up power, then activate the ballast bladder, change depth, then as
> > the
> > strip recovers you return to your trimed depth.
> >
> > Asking the heat of a light bulb to change the density of a gas
> > sufficiently to
> > displace enough water to matter is not an efficient process.
> >
> > Benjamin Edward Hitchcock wrote:
> >
> > > ----- Forwarded message from Wilf Rigter -----
> > > Using a light bulb to change buoyancy won't work since buoyancy is
> > affected
> > > by the displacement of water with a volume of lower density. So the
> > rigid
> > > glass bulb is the problem. A bladder filled with an incompressible
> > substance
> > > which changes volume and density as it is heated should work.
> > >
> > > alright!
> > >
> > > ---
> > >
> > > I love it! Using a lightbulb to change buoyancy! Fantastic! There
is
> > a
> > > way to do this - put a partially inflated balloon around the
lightbulb.
> > > This will make the whole assembly watertight as well, and make a cool
> > > coloured 'glow' when the device is on. Maybe you could use a magnetic
> > > coil on the bottom of the cylinder attached to the mains, and have
> > another
> > > coil on the bottom of your bot. This would charge up a capacitor, and
> > > coupled to a solar engine would make the bot sit on the bottom
chanrging
> > > up, then light its 'engine' and drift up to the stars!
> > >
> > > VERY elegant.
> > >
> > > Nice idea!
> > >
> > > Ben
>
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