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BOILERS & COGS: Aerial Steam Carriage
What is your review for the miniature apparatus called "BOILERS & COGS: Aerial Steam Carriage"?
Boilers & Cogs: Aerial Steam Carriage (Hover)
I've looked at books like this before. They try to give a science to how things like this might be possible. Its totally good if you want to make a game around one of those medieval inventions.