©Novel Buddy
Previous chapter:
Chapter 174 industrial area
Next chapter:
Chapter 176 Heart answer
PREVIEW
... essure vessel providing gaseous fuel, firewood or charcoal alone can be used to heat the air. The efficiency is low, and it is not far from the fuel limit. This is also the principle of hot air balloon discovery in history, but the reason for the first use in the actual combat is the hydrogen balloon. So Roland simply gave up the burning device and let Anna heat the ignition.
The difficulty of the airbag is the airtightness, but for Roland, who has borrowed the experience of the predecess ...
YOU MAY ALSO LIKE