[raspberry-vi] Re: Pringles Speaker
- From: "Michael A. Ray" <mike.ray@xxxxxxxxxxxxxx>
- To: raspberry-vi@xxxxxxxxxxxxx
- Date: Fri, 29 Mar 2013 12:08:45 +0000
Les,
The efficiency is totally dependant on the quality and accuracy of the
circular hole in the metal bottom plate. When I made one a few years
ago I used a Q-Max hole punch of about 20mm hole diameter. The more
accurately you can centre the hole and the cleaner the hole edges the
further it will fire a coherent toroidal vortex. You can get the Q-Max
punches from electronic tool vendors like Maplin.
You also need to very firmly anchor the membrane around the open end of
the can so that you can pull it back as far as you can without pulling
it off. Don't be tempted to fire it at a person's face from close range.
Mike
On 29/03/2013 11:56, lsmithso@xxxxxxxxxxxxxxxx wrote:
>
> That's irresistible . I'm going to get my 11 yo son to help me build
> one of those. He made a Pringles periscope at school the other
> week. A hacker in the making?
>
>
>
> >
> > You can make a good air-torus cannon out of a Pringles can...
> >
> > Use a hole punch to make a circular hole in the exact centre of the
> > bottom metal plate. Fix a deflated balloon, or an unmentionable object
> > commonly made of latex over the open end...
> >
> > Aim the 'cannon' at a candle about fifteen feet away and stretch out the
> > flexible membrane as far as you can and let it go.
> >
> > This fires a fast moving torus of air towards the candle and will blow
> > it out.
> >
> > Mike
> >
> >
> >
> > On 29/03/2013 11:40, lsmithso@xxxxxxxxxxxxxxxx wrote:
> > >
> > > Pringles have a proud tradition in hackerdom. Years ago I built a
> > > Pringles Cantenna to boost my wifi signal. It consisted of a Yagi
> > > arial made from a threaded stud and a bunch of large washers acting as
> > > reflectors, all mounted inside the Pringles can. There was some debate
> > > about just what contribution the can made to boosting the signal. It
> > > was a good hack.
> > >
> > >
> > >
> >
> > --
> > Michael A. Ray
> >
> > Analyst/Programmer
> > Witley, Surrey, South-east UK
> >
> > github username: cromarty
> > raspberrypi.org username: cromarty
> > Ham Radio Call-sign: G4XBF, licensed since 1982
> >
> > 'Entia non sunt multiplicanda praeter necessitatem' - Ockham's razor
> >
> >
> > Raspberry VI:
> > http://www.raspberryvi.org/
> > NVDA, the best free screen-reader in the world:
> > http://www.nvda-project.org/
> >
> >
> >
> >
> > ===========================================================
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> > Administrative contact: <mike.ray@xxxxxxxxxxxxxx>
> > -----------------------------------------------------------
> > Raspberry Pi and the Raspberry Pi logo are trademarks of the Raspberry Pi
> Foundation.
> >
> > This list is not affiliated to the Raspberry Pi Foundation and the views
> and attitudes expressed by the subscribers to this list do not reflect those
> of the Foundation.
> >
> > Mike Ray, list creator, January 2013
>
--
Michael A. Ray
Analyst/Programmer
Witley, Surrey, South-east UK
github username: cromarty
raspberrypi.org username: cromarty
Ham Radio Call-sign: G4XBF, licensed since 1982
'Entia non sunt multiplicanda praeter necessitatem' - Ockham's razor
Raspberry VI:
http://www.raspberryvi.org/
NVDA, the best free screen-reader in the world:
http://www.nvda-project.org/
===========================================================
The raspberry-vi mailing list
Archives: //www.freelists.org/archives/raspberry-vi
Administrative contact: <mike.ray@xxxxxxxxxxxxxx>
-----------------------------------------------------------
Raspberry Pi and the Raspberry Pi logo are trademarks of the Raspberry Pi
Foundation.
This list is not affiliated to the Raspberry Pi Foundation and the views and
attitudes expressed by the subscribers to this list do not reflect those of the
Foundation.
Mike Ray, list creator, January 2013
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