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The first point, in the absence of pressure vessels that could provide gas fuel, he had to rely on firewood or charcoal to heat the air. However, the efficiency of this was too low and he had to come to accept that he wouldn’t be able to fly with it very far with it.
This also meant that the principle of hot air balloon travel had been discovered much earlier than in Roland’s original world, but nevertheless, there was a reason why they had only been able to use it in real combat afte ...
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