I'm drafting a new fantasy which would be based on a society living in the real-world equivalent of the Renaissance period. I'd like to have some sort of large-scale flying machine (such as an airship) and would like some input from anyone else who knows about the period. I know that flying machines were not built during this period (aside from hot air balloons) but was there the technology available for it, if we assume that Renaissance engineers lacked the know-how to use it? I'm looking for something that will not seem a glaring technological anachronism in the time period that it's written for. Any pointers?