I’m currently working on a scene for a book where the heroes stumble across a seemingly abandoned Age of sail airship. After a brief investigation they find that the entire crew seems to have mysteriously dropped dead. How and why I am keeping close to the vest, but what I want to know is, **if all the crew are dead, how long could such a ship remain airborne?** I want to know weather or not the ship will be flying or crashed by the time my heroes stumble across it.