Grid Failure is one of the more likely scenarios for TEOTWAWKI-Day and dying of thirst three days later will probably be an unavoidable consequence for a lot of people. The deeper a person lives in a metropolitan zone the more likely they will be to have to bug out in hopes of finding drinkable water (somewhere!) that hasn't already been polluted by the Unwashed Masses. On this thread I will consider us Prepper-types that either Bug-In, or have a viable place to Bug-Out to when things go bad. Later on in this thread I 'll see about posting plans for a manual surface pump that a person can make out of (mostly) PVC in a day for pretty small change. Having a pump like that on hand and ready to set up can ease a person's worries considerably. First, however, I'd like to share a way to make a pump like that run without electricity. No gens, bats or solar cells. No windmills. All manual, but with almost zero sweat. A few years ago I ran across a very interesting invention called a 2-stage mechanical oscillator. I studied it quite deeply. It has some remarkable properties. Imagine two kids on a . One is fat, and one is skinny. The skinny kid can't raise the fat kid on an even , so he lengthens HIS side by 300%, planning to get a little leverage to help him out. No joy. The fat kid is just too fat. Finally the skinny kid starts hanging from his side of the like a monkey, and swinging back and forth. Pretty soon, he's got the fat kid bumping up about six inches on every swing, because momentum is a Wonderful Thing. The skinny kid will never get the fat kid up level, but he can bump him all day long. Except that his arms get tired, So the skinny kid hangs a weight just as heavy as he is from a rope as long as his arms are, and starts THAT swinging. Well, physics being as they are, the same weight, the same swing, the same momentum, and the fat kid starts getting bumped again. Now here is where it get's interesting. The , the weight, the rope, and the fat kid are a two-stage mechanical oscillator. And what happens is this: As the weight swings, the fat kid bumps up. When he bumps back down he PUMPS the swinging weight. So it keeps on swinging. And bumping the fat kid up, and getting pumped when the fat kid goes back down. The weight won't swing forever, but it'll swing MUCH longer than it would as a simple pendulum. Take a mechanical water pump. The kind that one or two grown men would have to slave over all day in the hot sun to pump enough water for...irrigation, let's say. On the other hand, if a 70-lb weight is attached to the pump handle with a suitable "", the skinny kid can start the weight swinging, and once the bumping starts, the water will come out like two grown men were pumping it hard. But the skinny kid won't even break a sweat because, about every fifth swing, he can give the weight a little poke with one finger, and keep the weight swinging, and the water pumping, all day long. I know this sounds weird. But I've seen (and done) the math, and I've seen the videos. It's a machine that works very, very, efficiently, and it's simple enough to rig up with little more than an old engine block, a bit of chain, and a stolen . (Well--it doesn't HAVE to be stolen. You can make your own pretty easy.) I have all the data in my files. It'll just take a little excavating to get down to it. Starting this thread now (even though this all probably sounds like a stone tease) will motivate/commit me to dig it out and post it. It may be a couple of days, 'cause I'm busier than a one-legged man trying out for Dancing With the Three Legged Stars, but I'll find it and get it posted.