Hibernating for the Winter
The hoist took quite a bit of pondering. It needs to be easy to use, but strong enough to hang a boat for months at a time. Old problems tend to have many solutions, and lifting heavy objects is about as old as problems get. Often each method will create a new problem for every one it solves, so settling on the right combination required some thought. It can get complicated. Like friend Steve Early, I confess to a preference for simple tools. Well, in my case, it’s an actual need, a handicap, and I believe I go a bit further than even he does.
Another issue is the old ways of doing things of this sort are all but forgotten. The knowledge is getting fuzzy, even in old timers, and the local hardware stores – which used to serve as impromptu reservoirs of knowledge and the tools to use it – have been replaced by big box home supply stores where you’re lucky if you find any knowledge at all. They would rather sell you a hydraulic lift or electric winch than a good block and tackle, which they won’t even stock.
Fortunately, I still had some tools and know-how left over from an earlier project.
Years ago I started a log cabin way back in the woods. The site was remote, about 3 miles from the nearest power lines. There was no road for the last mile, and I was working alone. The nature of the project necessitated an entirely different way of thinking about all sorts of problems. Modern construction techniques and tools were quite useless there. Suddenly even the most basic task, like moving a 20 foot long log just a few feet, required major feats of engineering. And I needed to move a lot of logs a long way through the woods.
Back in the days before the internet (remember those?) knowledge came in the form of books. I came across two books that were extremely useful, both via tips from friends: Jan Adkins’ Moving Heavy Things, and the Army Corps of Engineers Engineer Field Data pocket reference. Two very different approaches to the same topic, but both quite indespensible.
The Adkins book is a real pleasure. It’s less than 50 pages long and consists almost entirely of elegant hand drawn illustrations, like a kid’s picture book. ‘Nuff said. The “pocket” field guide, on the other hand, is over 400 pages long and contains all sorts of formulas, charts, tables, etc. (no wonder army fatigues have such big pockets); but it has a couple of chapters on simple machines, building bridges and such, that even I can understand. These supplied the know-how.
The best source for the kinds of tools I needed turned out to be a small shop in a former gas station on the edge of town, a no-frills affair that catered specifically to professional loggers and riggers. Though loggers now use bulldozers and other heavy machinery, they still have to work out in the wilderness and still occasionally need tools that haven’t changed in hundreds of years. Alongside two dozen varieties of chain saws, I found heavy duty blocks and rope, nylon slings, cable harnesses, carabiners, peavies, pry bars, hand winches and come-alongs. Come-alongs are annoying to use, in my opinion, but I went home with some of everything else.
From a damaged boat trailer I bought a large hand-winch, spooled with steel cable. Chaining that to a tree, I could run the cable from where the logs were felled, to other trees standing closer to the cabin site. Tightening the cable made a sort of zip line, and I could lift the logs with a block and tackle and roll them down the cable on a pulley with a gentle push, even shooting them across ravines. Pretty slick, though I admit I quickly learned to only fell logs UPHILL from the cabin site. I got so good at this sort of thing my buddies began to refer to me as Barry “Mechanical Advantage” Long.
Today, the lifting tools I can find locally consist of a chain hoist for lifting engine blocks, hydraulic versions of the same, or electric winches. The Boat Shed has no power, anyway, but all of those options require a very strong place to mount whatever it is, because they lift from a single point. Frankly, nothing in this old shed is that strong.
Since I still have most of the gear from the cabin building days, I could experiment a bit. The nylon slings made for big logs work fine for a little boat. My first thought was to use the hand winch and some blocks to supply the lifting power. The problem with that, though, is the winch is so powerful there is no tactile feedback for how much tension is on the cable. I could easily pull down the whole shed without warning. The roof is already sagging. This problem needs an even simpler solution.
So, after tying the ceiling joints into the rafters for extra support, I added a cross bar of sistered 2×4’s. To that is tied a series of blocks, spaced out to disperse the weight, giving an 8:1 advantage.
This worked pretty well. With the added friction in the system, tugging on one end of the rope will lift the whole 200 pound boat in the air with about 30 pounds of pull. I had to play with how the rope weaves through the various blocks, because the boat is lifted from two points, but all the pulling is done from one end, which makes it problematic to apply lift evenly.
My heavy duty logging blocks were overkill for this job, and I still need to use them for other things. So, once the arrangement was set, I had to replace them with the only blocks I can find around here – cheap Chinese junk that doesn’t work very well at all – sharp edges everywhere that catch the rope, poor design, and bad bearings. Too much friction. If I had a bunch of spare sailing blocks they would be perfect, but they’re too expensive for my budget at the moment, and there’s nothing else to be found in between.
The simple one-point sling seemed to put too much side pressure on the hull. It’s likely after a few seasons the hull would get deformed. Adding a spreader for the slings not only removed the pressure, but allowed more clearance to lift the boat higher.
So here you can get an idea of the whole arrangement, and the inside of the “new” shed:
In the Spring I’ll finish work on the double rack for the trailer. I want the boats to be easier to launch and retrieve, which means they both have to ride right side up. There also needs to be a lifting mechanism on the trailer. Fun problems to think through all winter.
Boat lift, Melonseed Skiff