Ground Systems

Helium Fill System

The helium fill system consists of:

• 1 T-bottle of Helium, 2400 psi, 290cf
• A helium regulator with a barb fitting output output epoxyed into constructed PVC pipe adaptor (see below)
• [a fill diffuser?]  diffuser determined unnecessary because gas output not strong enough to damage or shred test balloon (condom)
• PVC pipe regular output adaptor: outer diameter of PVC pipe 1.25", 12" section joined with right angle elbow to 6" section to form a L. open end of 12" section sanded smooth and 6" end capped---cap drilled to accomodate end of regulator which has been vigorously/permanently epoxyed into endcap. all PVC parts sealed with primer and pipe adhesive.

Operation:

• Insert open 12" into balloon and temporarly lash securely with lace or cord. this will be removed after filling

Tie-down and launch apparatus

While the balloon is being filled, it will be held down with... anchor apparatus attached to line attached to filling adaptor (see "tying balloon" page)

The payload will be attached after the first closure of the balloon. end of payload rigging attached to "O" of webbing, or loop of line.

balloon closes like this: tie off after filling, slide O ring of webbing or other rigging onto end of balloon, just below first tie. bend end in half so that O ring or line is tied around the whole end/bend of balloon. lash up end that is folded up

Prior to launch, the payload, recovery train and attachment harness will be laid out in line with the predominant wind direction (if any) with the "lowest" part of the payload the most upwind.  When the launch command is given, the payload manager will lift the payload gondola and carry it clear of ground obstacles as the balloon lifts the launch train and drifts upward.

To prevent rocks and dirt from damaging the balloon, a ground cover will be laid out to provide a location to spread out the balloon.

Ground Communications

See Communication