Have you seen the old 1962 John Wayne movie Hatari? They
used rockets to throw a net over a tree and capture monkeys.

Allen (I'm dating myself again.)

> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-
> bounces@mit.edu] On Behalf Of John Ferrell
> Sent: Tuesday, October 08, 2013 2:51 PM
> To: Microcontroller discussion list - Public.
> Subject: Re: [OT]:: Potato throwers / Water rockets / ...
<-
> High speed camera
>=20
> I use an air cannon to put up antennas for Amateur Radio.
> My inspiration
> came from an article in the Ham radio magazine QST.
> Searching youtube for antenna launcher will show many
> iterations. My
> projectile is a capped section of 3/4" pvc tubing. Putting
a
> line over a
> 100' tree is no problem.  I use an air compressor to
charge it
> to a MAX
> 90 psi. Normally 40 psi will do the trick.
>=20
> On 10/7/2013 9:56 PM, RussellMc wrote:
> >>> Tis the age of paranoia.  :(
> > It is.
> > But, just because you're paranoid it doesn't mean that
> people aren't
> > talking about you!
> > :-)
> >
> >> A few years ago my nephew and his friends dabbled with
> potato
> >> mortars (pipe,butane). Despite it being a very rural
area
> and them
> >> doing it in the middle of nowhere, the local cop said
he'd
> rather
> >> they didn't
> > Potato cannon or more generally gas cannon can be lethal
> - both to
> > target and users.
> > People tend to use PVC pipe and are as likely as not to
use
> low
> > pressure waste disposal grade PVC. This is rated to
quite
> low
> > pressures, shatters in a nasty way when overpressurised,
> and can send
> > nasty shards flying in worst case situations. Some
people
> have made
> > rockets using such and found out why it was a bad idea.
> >
> > On the receiving end they can be 'dangerous enough'.
> Potatoes are, if
> > not harmless, then not too too dangerus mostly. But
> people tend to try
> > other things and I've seen photos of eg AA batteries
which
> have been
> > used to shatter reasonably solid pine planking. If
someone
> was killed
> > by a potato fired from such people would be suitably sad
> but should
> > not be surprised.
> >
> > Odds are the use of such a device may be classified as
an
> unlicenced
> > firearm by the police if they so desire and, if that did
> happen, it
> > may be hard to convince a courtthat your opinion was
> superior to
> > theirs.
> >
> > Competently constructed water rockets made from soft-
> drink bottles
> > using CO2 pressurisation can reach maximum accelerations
> of round 100g
> > and altitudes of several hundred feet.
> > Water rockets made from long thin tubing can get to
> around 1000 feet altitude.
> > Purpose built no effort speared water rockets have
> exceeded 2000 feet
> > altitude (World record 2044 feet average of 2 flights
2007)
> >
> >
> http://www.uswaterrockets.com/world_record/menu.htm
> >
> >
http://www.wra2.org/WRA2_Standings.php
> >
> > A finned and nose coned 1.5l Pepsi bottle rocket without
a
> parachute
> > or descent control system will impact at around 80 kph.
[
> !!!!]
> >
> > I hold the world record (probably) for launching a
single
> water rocket
> > from the most countries (or single rocket launched from
> the most
> > countries, or ... ) but nobody seems to know or care ;-)
> > [Over 20 countries, in 2003 :-) ]. One of these days I'd
like
> to
> > launch an Intercontinental Ballistic Water Rocket [
ICBWR]
> whih would
> > also be an ICBM. Across the Rio Grande from North to
> South America is
> > one possible location :-).
> >
> > _____________
> >
> > Suitably impressive paper: Open access. BOAI (free)
> licence.
> >
> > Title :A more thorough analysis of water rockets: Moist
> adiabats,
> > transient flows, and inertial forces in a soda bottle
> > Language :English
> > Author, co-author :Gommes, C=E9dric  [Universit=E9 de Li=E8ge
-
> ULg >
> > D=E9partement de chimie appliqu=E9e > G=E9nie chimique -
> G=E9nie catalytique
> >> ]
> > Publication date :Mar-2010
> > Journal title :American Journal of Physics
> >
> > http://orbi.ulg.ac.be/handle/2268/36471/?locale=3Den
> >
> >
> >   R
> >
>=20
> --
> John Ferrell W8CCW
> "Shut her down Scotty, she's sucking mud again!"
>=20
>=20
> --
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> archive
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