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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #1  
Old 04-12-2006
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Help identifying a bit of gear

forgive my new old-boat owner ignorance, but what the heck is this thing? It came all tangled up with the roller-furling stuff, but that doesn't necessarily mean they go together.

By the wear and dirt pattern, it looks like it was once boom- or mast- mounted, and with the two triple blocks it was obviously used to tension something... Something you would want to be able to quantify with the graduated scale on the side...

but what?



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Old 04-12-2006
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I believe it is a Harken Magic Box (or similar.) Magic Boxes are powerful, multi-part tackles housed in an aluminum extrusion. The box eliminates twists and keeps the line organized. A ball bearing system prevents friction between the sheaves and between the sheaves and the axles. Magic Boxes are used on boats from small dinghies to large offshore racers. Hi-load versions use Torlon bearings.
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Old 04-12-2006
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magic box

Its called a magic box and it is used to tension the foot of the main.
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Old 04-12-2006
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Magic boxes

We used to use a magic box to adjust the jib halyard tension on our Soling (27' fractional rig, ex Olympic keelboat) You could probably also use them for a jib or main downhaul or cunningham on a larger boat. The small line isn't easy on the hands, but it's sure a powerful mechanical advantage if the thing you're moving doesn't have to move too far.
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Old 04-13-2006
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And the markings on the side are so you can record the settings for various uses. For instance, if you're using it as cunningham, you can see how much you're tensioning the luff of the main.
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Old 04-13-2006
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This type of box is often used inside the boom for the outhaul, only the rope tail needs to come out of the exit hole.
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