Members of the ASC had a bungy cord in the 1970's that they intended
to use launching gliders from local ridges. the closest we got was to
launch a Libelle a few times on low hops along the Gawler Airfield.
At 11:02 AM 13/03/2006, you wrote:
They still bungy launch at the Long Mynd. Last time I looked they had
photos on their web site. No horse or car, just around 20 bodies and a
big rubber band :)
The Essex Gliding club used to reverse pulley launch from North Weald
until the mid 80's. They may have some information of use
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:aus-soaring-
> [EMAIL PROTECTED] On Behalf Of John Giddy
> Sent: Monday, 13 March 2006 11:16 AM
> To: Discussion of issues relating to Soaring in Australia.
> Subject: Re: [Aus-soaring] Reflex or bungy launching ?
>
> AFAIK,
> In classic Bungy Launching, there is no car. The ends of the bungy
cord
> are pulled forward of the glider by teams of helpers, or a horse
> (funny/sad apocryphal story about horse bungy...) when the bungy was
> stretched sufficiently, the glider was released, and used the stored
> energy in the bungy to get airborne.
> Bungy launches were/are usually done off a hilltop or cliff edge, so
the
> glider need not climb too much to reach a soarable height above the
> ground, and can use available ridge lift to continue soaring.
> John G.
>
> Michael Derry wrote:
> > http://groups.yahoo.com/group/pulleylaunch/
> > cc: others
> >
> > Dear All
> >
> > It is interesting to hear stories about hiring a vehicle for a
weekend of
> > towing. It makes a lot of sense from the point of view that you have
an
> > operational and maintained vehicle ready to go.
> >
> > Launching in 1:1 or conventional autotow for that matter you have
the
> > problem of getting the tension right as the glider goes through the
wind
> > gradient. Using a weak link/stetchy polyprop rope and only a 6cyl
car in
> > nil or light winds minimises the likelyhood fo overspeeding however
if
> > this is not done correctly you can loose a couple of hundred feet
height
> > of what you really could get out of the launch. The problem
manifests
> > itself with less experienced drivers. On the positive side of
things,
> > the consequences of a less experienced driver do not seem to be as
bad as
> > with winching.
> >
> > A minor amount of training can overcome the problem.
> >
> > If of course you use 3:1 then it is a dead snap keeping the tension
> > exactly as you want it through the whole launch.
> >
> > I am interested to know more detail about bungy launching and how it
> > worked ?
> > -cars used
> > -engine size
> > -manual or auto transmission
> > -traction issues
> > -strip length verses launch height
> > -type of rope and length of rope
> > -glider type and weight
> > -what control was there over tension
> > -where it went wrong and was dangerous
> > -etc
> > -etc
> > -etc
> >
> > Cheers
> >
> > Michael Derry
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> >
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Regards
Rob Moore
08 82588026 home
0412 055 888 mobile
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