Re: [Faber] Jumpapel or not?
Whether a low object is jumpable is largely going to depend on the landing area. Assuming ideal landings (straight flight into an unobstructed area), I'd say that something around 20 stories should begin to approach a jumpable altitude.
The stories on buildings vary in height. In the U.S., I generally approximate 10 feet (3m or so) per floor. However, the floor heights are different for office, residential and industrial buildings, so this is
only an approximation. I know one 33 story building that lasers 491 ft, and one 23 story building that lasered just under 200 ft.
In the U.S. (it's probably different where you are), a good rule of thumb is "if it has lights, it's worth a look". If you see aircraft anti-collision warning lights (here they are red, either solid or blinking), then it's probably worth checking out.