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Old Nov 03, 2004, 04:11 PM
Bruce Hobbs
Guest
n/a Posts
zip launch HLGs

Soaring League of North Texas (SLNT) puts a length of string or
monofilament inside the surgical tube that limits how far you can
stretch the hi-start thus making the energy and resultant launch height
fairly close to what the DLGs boys can get. Yep, the zip start guys are
anchored in place and cannot move around the field like the DLG
throwers..but..nothings perfect..and it gets a lot of guys out to the
field flying their older ships and having fun.

BCNU
Bruce Hobbs


Old Nov 04, 2004, 02:11 AM
Tim Bennett
Guest
n/a Posts
Re: zip launch HLGs

I am the CD for hand-launch for the SLNT. We have a contest every month,
even in the winter thanks to our usually good weather. We haven't used the
zip starts that Bruce describes for a couple of years due to the emergence
of disk launch and the difficulty of achieving reasonable equivalence
between a zip start and disk launch. To match a good disk launch, you almost
need an upstart which is so long and time consuming to shag and stretch that
you are hard pressed to get more than three launches in a ten minute time
slot. Other models getting snagged in the line or flyers getting tangled in
it on the ground are also problems we have seen. As a result, the zip starts
have fallen into disuse.

----- Original Message -----
From: Bruce Hobbs
To: Soaring@airage.com
Sent: Wednesday, November 03, 2004 3:22 PM
Subject: [RCSE] zip launch HLGs


Soaring League of North Texas (SLNT) puts a length of string or
monofilament inside the surgical tube that limits how far you can stretch
the hi-start thus making the energy and resultant launch height fairly close
to what the DLGs boys can get. Yep, the zip start guys are anchored in place
and cannot move around the field like the DLG throwers..but..nothings
perfect..and it gets a lot of guys out to the field flying their older ships
and having fun.



BCNU

Bruce Hobbs



Old Nov 04, 2004, 12:11 PM
Aerofoam
Guest
n/a Posts
Re: zip launch HLGs


>We haven't used the zip starts that Bruce describes for a couple of years due to the

emergence of disk >launch and the difficulty of achieving reasonable equivalence between a
zip start and disk launch. To match >a good disk launch, you almost need an upstart which
is so long .....

If the HLG can take a hard hand launch, it should be able to take
a hard (relatively) catapult launch.
The answer may be to use a stronger rubber (like my 2m Comp. or 3m.)
in a short 10' catapult with an internal limiter.
I use spectra in my military bungees, but mono or braided
would probably be fine for HLG.
The catapult launch would make it necessary to install a second hook (tape on)
about 1" forward of a normal hook position. This keeps the nose down and
allows the plane to accelerate rather than climb like a kite.

Mark Mech
www.aerofoam.com


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