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Posts Tagged ‘Capentry’

Here it is!

The owner installed the chain to hang the net swing temporarily, then asked me to move the swing. An outdoor aerial silk is supposed to reside here one day.

Check out the plans. The basic concept is there, but the homeowner wanted the addition of a climbing net, a zipline, a beam for the aerial silk, and a good place to mount the net swing. For cost reasons that eliminated the slide and monkey bars. The fold down table became a doorway for the climbing net. The climbing wall got lowered from 9′ to 8′ and 7′ wide to 8′ wide. The zipline resulted in changing from 4 x 4 posts to 6 x 6 posts and adding all of those diagonals.

The zipline, due to height of the playhouse and surrounding topography is steeper than suggested. So we began to look for a way to slow the ending. I added a spring and a friend added a magnetic break. They work on the same principle as dropping a magnet down a copper pipe. Copper does not magnetize but it does conduct electric current well. Therefore, when the magnet is moving down the pipe a current is induced which has a magnet field which just happens to be counter to the magnet’s field. The magnet is slowed by this counter-EMF. So is the magnet surrounding the zipline cable. The black bungee brings the magnet back to the point for the next braking action. So, the zipline is fast but has a controlled stop.

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