No science involved with what I am about to say, but I use short lengths of chain to hang from on my indoor set up, continuous loop amsteel on hammock, attached to chain, and chain anchored to wall. On the other side of the room I use whoopies from hammock to large eye screws. It probably is only in my mind, but I seem to have much longer swings from the chain suspension. By the way, I really do not like to swing, so the faster it stops is what I am after, but still, chain seems to swing longer.
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