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kruelkare -> RE: Seeking Ideas to Create that perfect Dungeon (4/14/2005 7:03:05 AM)
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When putting together furniture or fittings, most especially suspension fittings,
"Over-engineering" should be your key word.
This involves things like estimating the maximum weight you might want to suspend,
then doubling it. Then calculate the strength needed for all the fittings - think "weakest link" -
and double that...
Now, don't forget that people in suspension may not keep still, so they will be bouncing up and down or side to side... this means sudden "shock loads", greatly in excess of their static weight.. so double all the numbers again... I'm sure you get the idea by now... :-)
Don't expect ordinary wall studs or ceiling joists to provide adequate support... fit well-secured "pads" inside the wall, or roof space... and use heavier material and fittings than you can ever imagine needing...
(Go and take a look at a construction site, see what they make walls and ceilings out of... see why they don't take the load?? :-)
You also need to consider how you're going to get people loose in a hurry, if an emergency arises.
Look into "panic-snaps" and the like, but make sure they can be released under tension.
A handy item to look at is a "spinnaker snap"... we use them on sailing boats, for a quick-release of sails under, literally, tons of tension.
Unless you're very sure of what you're doing, get a professional to do it for you.
Look at it this way... unless YOU would feel safe hanging head-down over a concrete floor in it, don't ask anyone else to... (The best rigger I ever met, did just that at the beginning of each evening's use)
regards
K
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