by Steve Osborne

Helium

Balloon laid out, ready to fill

Tare weight (sandbag) attached to balloon prior to fill

Helium is filling balloon

Flow control of helium

Partially filled

Half to maybe two thirds full

Just before balloon is filled

Balloon lifts tare weight. It's fully filled for flight.

Removing Fill valve and hose

Inserting sealing "bolt" into PVC neck fill tube.

Bolt inserted, balloon sealed. Next step is to tie payloads to support lines.