Re: [cesslon] 330 feet low or very low ?
> but since this is jumpable...
Who decided your smokestack is jumpable?!?!? Just having seen the one jumper that jumped it 10 years ago? Did he do the jump of his life luckily walking away with it in his jump-of-a-life-time or is it repeatedly and "safely" jumpable? You CANNOT know it, since currently you do not have any information about landing area, landability into or outside factory premises, and so on...
> who knows maybe 10 years time ill be a base jumper and ask the company for permission
Sorry to destroy your dreams, but you will never have the permission from the company to jump it daylight and legally. What guarantees can they have that you don't smash yourself down, and destroy parts of the factory, and the mess with a fatality, police, whatever...?
> as i dont know how far you can glide from that hieght i couldnt really say if there was safe landing
if you can glide with ya parachute 60 metre's from there chimney base there would be safe landing in open paddocks
You COULD, granted you got a flying parachute 50 m below exit point, 100 m is object's height, so you are flying at 50 m of altitude. Conservatively, a BASE parachute has an efficiency of 2 (for every meter you go down, you travel 2 m forward), so you COULD get to the open paddocks 60 m away from chimney's base, but... ...what if you cannot exit exactly in the direction facing the paddocks? ...what if you open slightly lower? ...what if releasing your brakes you find yourself with a good flying parachute at 40 m of altitude, maybe 35m? ...what if at 35÷40 m of altitude you get caught but a wind gust (not even that strong) in the opposite direction? ...what if in the "journey" towards the paddocks, 60 m away, you encounter the factory fence/wall that is 5 m (let's say) high? Remember that you must clear any object in the flight path (walls(fences/light poles/whatever...) with your body with a good clearance (see above wind gusts).
So.
In order to say that your chimney, and ANY object, is (repeatedly and "safely") jumpable, a BASE jumper must evaluate the object (exact object height, possible directions to jump off, landing area (=reachability of landing area from designated exit point), alternative landing areas, bust factors involved in the jump, whatever else...).
> whats the lowest object advanced base jumpers will jump from ?
It looks like a question way ahead of its (=your) time... At your stage, I think you don't need really to know which is the lowest height jumpable...
But, again, the height jumpable is directly correlated to landing area (=availabilty and easyness of landing area), in the sense that the lowest the object is, the easiest must be its landing (easiest=soft consistency and availability (=must be just under and all around the object)).
Then again: what is the surface under your low object?
Because if the surface which you are going to land on is flat rock/concrete/tar, I could have in mind a "lowest" height-1 jumpable, if the surface which you are going to land on is paddock/meadow/mud/similar surface, I could have in mind another "lowest" height-2 jumpable.
If you are going to land on shallow water, I could have in mind another "lowest" height-3 jumpable.
If, finally, you are going to land on deep water, I could have in mind another "lowest" height-4 jumpable.
Please, consider that in case of height-4, such a height-4 can be something around 25 m, which height-4 could be easily taken down to 20 m - 15 m - 10 m - 5 m - zero, simply because in that case you don't really have the need to jump WITH a BASE rig, granted that if the water is really deep enough, a diver with good ability/training can dive (feet down) off that height (25 m). So the story of a BASE rig, parachute, whatever, is no more necessary...
Consider, finally, that clavadistas in Acapulco do their clavados (=dives) from 42 m or so feet down AND arms/head down. And they do jump off their "exit" point on the natural wall over the "La Quebrada" canyon WITHOUT a BASE rig.