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... erification model was not particularly grand. Perfikot didn't even invite anyone to witness it. Once everything was ready, she filled the airship's balloon with inert helium gas, allowing it to float in the air.

Perfikot obviously couldn't use the hot air balloon method to make the Flying Airship fly; it was fuel-intensive and unsafe.

After all, hot air balloons use heated air to gain lift, which requires a continuous supply of heat to warm the air.

Coal's heat value was ...

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