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If you live in an area where livestock are kept some types of hot-air balloon can cause real problems if they get lost. Many balloons use wire to support the burner, and may also use a wire ring to keep the opening at the bottom of the balloon stiff.  If you lose sight of one of these balloons it may crash in a field containing livestock. Large animals sometimes try to eat crashed balloons and sharp ends of the wire can cause severe internal injuries.

If you live in an area like this you should build wire free model hot-air balloons. This is particularly important if you build long distance balloons, like the UFO balloon from The Hot-Air Balloon Book. Most model hot-air balloons only fly for a few minutes, so they are easy to follow while they fly and retrieve after they land. However, the UFO balloon can fly for over half an hour and even with a light breeze can travel more than five miles. This makes the balloon very hard to follow.

In most model hot-air balloons wire is used in two places:

1 Wire is bent into a ring that is stiff enough to keep the bottom of the balloon open and heavy enough to keep the envelope upright.
2 Wire is used to make the burner and supporting wires. Iron or steel wire keeps its strength even when it gets hot in the burner flame.

On this website you will find two PDF files that tell you how to build a wire-free version of the UFO balloon from Chapter 8 of The Hot Air Balloon Book. To make the wire-free UFO balloon:

1 Make the UFO envelope by following steps 1 to 24 from Chapter 8 of The Hot-Air Balloon Book
2 Make a cross-stick balloon base by following the instructions in the PDF file cross_stick_base.pdf
3 Make a wire-free multiwick burner by following the instructions in wire_free_multiwick_burner.pdf

How to make a base frame for a tissue paper balloon using two straight wooden rods.
How to make a wire free version of the multiwick burner from Chapter 8 of The Hot Air Balloon Book