Solar balloons - capable of all-day flight with no power source other than sunlight. Composed of simple materials: black plastic bags, black masking tape, and monofilament fishing line.
Another demonstration of the potential of solar power. These apparently have been scaled up to carry loads as high as 120 kg.
Popular Logistics is interested in hearing from people who’ve experimented with these balloons - particularly ham and other communications operators who’ve used them to elevate antennae.

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