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Matter:
The material used is low density polyethylene (LDPE) or high density (HDPE). At equal strength, HDPE is lighter than LDPE. Commonly, you will find LDPE trash bags.
Systematically, choose low-end garbage bags. In fact, it's top of the range for the activity!
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To weigh:
Weight is the enemy of anything that flies.
I recommend that you bring a scale with an accuracy of 0.1g.
For any realization, the surface of the balloon is provided. By weighing 1m² of material and multiplying by the area indicated, you will know if your balloon can fly.
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Thermo-welding:
It is the action which consists in connecting two sheets of poyethylene between them, using a soldering iron.
However, beware of welds.
For a solar balloon from 0m³ to 6m³, the welds do not require reinforcement. Beyond that, reinforcement by adhesive is recommended.
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Wind:
The other enemy is the wind. It prevents the envelope from inflating correctly. The pressure in a solar balloon is low. It is insufficient to counter the
pressure of a wind > 5 km/h on the envelope. I use theWindguru
website or app for my wind forecasts - Free version -
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Your designs:
You can extrapolate the dimensions provided in the plans orconsult me.Free quote.
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