Picture of A Third Hand for Sailing or Other Things
(Updated August 2008: new applications in new boat)

Evolution has done its best for us. However, evolution is conservative -- it uses what it has on hand, and it (if indeed it were an an entity, which it is not) is happy enough if a modification does not kill us, does not detract from our survival, and of course better still, aids our chances of survival.

Aids survival, that is, at least until we have produced offspring and lived long enough for our offspring to have offspring. Some theories suggest we should survive a little beyond being grandparents to help our offspring with their offspring for a few years. After that, evolution is done with us, and we should quietly die (preferrably after digging our own graves and being of minimal trouble to our kin group during this last stage of aging). Well, life is hard but them's the rules, and I didn't make them, though no doubt I will try to foil them by living for as long as I can).

All this has led to a defficiency of hands.

Yes, you heard me right. Evolution did not foresee that we would be sailing boats alone, or climbing ladders while carrying too many things, and etc. But, contigency is the wild card of evolution, which, when dealt, makes evolution's facial expression crinkle up in interested annoyance.

Now that the textual minimalists are pissed off, I must get closer to my point; simple: Many of us have experienced the sudden need for a third hand (seldom a third foot, but I am not so sure about that). You can buy a third hand from any store stocking carpenter tools, usually. You can build something more specific to your needs, too. Here I offer one for sailing.

But not just for sailing; I imagine you could attach a third hand to your belt/clothes for other uses. We do that even now, and it is called the carabiner or spring-slip, although we can improve even that very useful stage in the evolution of the third hand. But here is the specific context of my third-hand:

Often we need several hands when we are solo-sailing. These are called "cleats" and they have proved excellent companions. Sometimes we need cleats that allow quick-release features. These are often called "spring-loaded cam cleats" and they are great things.

I merely extended the idea. I wanted a cam-cleat thingie that I could use for any chance need on a boat. That is, some cam-cleats are dedicated, as you might see from a photo on my proa instructuable -- its bolted to the hull and fastens down the sail shunting line and does nothing else. But I had other, more varied needs on the boat, and for that I devised a non-dedicated third hand.

It hangs around, literally, until asked to do something. It might hold my sheet line when I need to fix something else with two hands, but I can quickly jerk the sheet loose to avoid a capsize. It might hold my canteen (all my boat stuff generally has a short line on it for cam-cleating). Or it might hold moy occasionally needed steering paddle or kayak paddle. You can see one of them hanging just below the gunwale in the photo below, left center.

Please have a look.
in a previous life i dove the wrecks off ny and nj about every weekend and usually was diving in February on the inshore shallower wrecks, around 80 feet to 90 feet deep
if you have a chance of a sudden gust capsizing you, , lines and water are very dangerous, especially thin lines like parachute cord. i know divers with multiple knifes that became underwater flags, most dive and corrosion Resistance knifes hold an edge like cheese, and will not cut through any of the technical 5 mm type accessory lines. well at least 25 years ago, damn time flies!
be extremely careful with water and lines, same goes for kite surfing.
there are newer knifes that are v or hooked shaped that have a sharp blade in the center, similar to the riggers/HALO hooked switchblade we had in the military
cheapchuck6 years ago
I'm fixing up a 1978 West Wight Potter and really like this idea. Many old boats tend to accumulate lots of holes from old ideas gone bad. With this type of device, a person might be able to modify the boat without mangling it. I'm going to make a "third hand" and install it where my lower hatch board (cabin entrance) is currently. This can be done by using the existing holes, and will allow cam cleats for centerboard up and down, as well as a cam cleat for the main-sheet.
Wade Tarzia (author)  cheapchuck6 years ago
I like those Potter's! They and boats like them are the essence of "the common person's adventure." I hope the third hand works out. let me know. In the 2009 Everglades Challenge many-day race (though we had a problem and dropped out early), my third hand was briefly useful, My captain and I were on a very skinny 21 foot double outrigger sailing canoe, with very little room. I lashed the third hand amidships where it took temporary care of jib sheet or main sheet while we squirmed around and got used to our time day aboard. I prophesize that had we been in the race for the full 6 days, it would have been pretty useful now and again. --Wade
As a sailor, I love this; there have been a ton of times where I want a cleat attached to my hip to hold a line while I work on something else. But man, it's pretty nerdy.
Wade Tarzia (author)  Number5Alive6 years ago
Nerdy? How so? No worse than wearing all those other things sailors wear such as hats, gloves, lifevests, knives, not to mention that cellphones-on-belts are the new fashion style, as nerdy as you can get (Star Trek, any one?). Consider it a mere incremental evolution, and you will do just fine ;-)
axiesdad7 years ago
Great idea. Thanks. I've been singlehanding for many years and never thought of this. There is a fairlead that looks sort of like a cleat with the horns bent back past each other that you could put in front of the cam cleat to keep the line pulling in the right direction.
Wade Tarzia (author)  axiesdad7 years ago
I used a brass door handle (flattened U shape) as a fairlead on my first version. I think I'd like your version better because sometimes you want to get the line out of there faster.
Kiteman7 years ago
What a neat idea!

How thin a line could they hold? They could be used to anchor single-line kites when you'rflying a few at once.

What! Kiteman make a spelling mistake!? Blasphemy! Nice instructable. +1


lennyb Kiteman7 years ago
oi mate there be no shootin in ere. this be a stabbing site. ssshhhk squish!!! THUD.
Wade Tarzia (author)  lennyb7 years ago
I rather wish it were a writing site. A Violence-Free Zone! ;-)
Just stab him with a pencil! Duh!!
Wade Tarzia (author)  agent7 years ago
OK, as long as it is the rubber eraser end.
"Truly, the pen is mightier than the sword, but only if the sword is wooden and the pen is four feet long with a sharpened steel nib."
marine stores (like west marine-the blood suckers of the boating world) sell extremely small cam cleats as well as other types of cleats and blocks (pulleys) that would certainly fit kite lines. if you were serious you could anchor blocks in the ground and run them back to a central table with adjustable cleats lol. then kick back at you "command center" as wade called it, and have a beer!
Wade Tarzia (author)  Kiteman7 years ago
Mine do not touch when closed, and I just tested it on 1/8th inch cord, and no go. However, these plastic cams could be modified by adding something to them so that they would touch, I should think. Glob on some rubbery adhesive that might stick to the plastic cam and mix in an abrasive for good line-holding, and then separate the cams with something that would not adhere to the glob-mixture (plastic wrap?), who knows? Sounds like you could have a kind of kite-line command center if it could be made to work!
Too smart. Great job. Amazing. +1. :-)
Leon Close7 years ago
This is seriously clever. It's usually not too much trouble to attach a dedicated cleat permanently but this is perfect for refining the rigging of an experimental boat without drilling holes all over the place. A few of these are going on my still-to-finish list.