The Field Setup instructions specify the attachment and the tension for the
zip line.

It's on page 11 of the Challenge PDF, in the section about the Cargo Plane,
under the 3 close-up pictures:

Put the hook end of the string through the plane’s trolley from nose to
tail, and hook onto the hitch bar, and latch the plane to the tower. If the
string is not parallel to the runway, you can pull the tower’s Dual Lock
apart, move the tower a little as needed, and then press it on again.
Finally, use the thumb-gear at the arrival end to put tension on the string
until the cantilever (tire/arm weight) sits mostly level.

At tournaments, we will adjust the tension so that the cantilever sits
mostly level.

I have not had a chance yet to set up this model on an actual table (but I
am looking forward to doing it this week), so I cannot comment from
personal experience about how close the cantilever will be to level.
 Having built several kits, I know that the total length of the string will
vary slightly, due to where knots are tied, and stretching of the string
over time.

There are several items on an FLL field that vary slightly during the
season.  During the practice season, teams may run robots a lot on the mats
and with the mission models.  New mats and kits will behave slightly
differently than "experienced" mats and kits--a little dirt gets worn in,
string will stretch, dual-locked models may get knocked into, mat folds may
relax and get lower, etc.  Some of the experienced coaches on this email
list can provide tips along these lines.

Tournament kits are new for the early season tournaments and get more
"experienced" for the later tournaments.  We follow the directions in the
Field Setup between tournament rounds or after a bunch of matches:

"Mission Models - Keep the models in original condition by straightening
and tightening solid connections often. Ensure that spinning axles spin
freely by checking for end-to-end play and replacing any that are bent."

Steve Scherr
VA/DC FLL Referee Advisor

On Fri, Sep 6, 2013 at 5:21 PM, Bdh612-ess <[log in to unmask]> wrote:

> The setup instructions never specify what the tension is supposed to be (I
> never found how the string is even supposed to be attached). How will it be
> done at tournaments? I want the kids to be practicing with the right setup.
>
> Brian
> Waterford Robotics
>
> Sent from my iPhone
>

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