It's not a thermosyphon - if you've made one you'd see that it isn't. The flow isn't unidirectional.

The water is raised to boiling at which point it flashes to steam and ejects a spurt of water down the pipe and out. This provides the impulse to drive the machine forwards. Because of inertia the water always overshoots a bit and is then sucked back into the heated area, rapidly cooling it so the steam condenses and we're back to the beginning of the cycle again.
At first sight it may appear that this will produce no net thrust but since the jet being expelled tends to go all in one direction wheras the water being sucked back in will tend to come from all around the inlet there's an imbalance leading to an overall thrust.
Provided you can arrange a way to fill then chamber these motors will run fine on just one tube.
Simple motors can have just a coil of tube as the heating chamber, posher examples have a diaphragm over the top which pops up (like a food jar lid) with each expansion and flexes down again after. This makes the motor run better and provides a satisfying pop-pop noise. The coiled tube sort are nearly silent.

30mm grapes! Wow!

When I was a kid we used to launch home-made hot-air baloons at night. For several weekends we had UFO watchers on top of the North Downs in Kent watching the flickering lights in the night sky and had several reports in the newspapers.

84% and I'm not American! It reckoned I'd missed a few questions that I'm fairly sure I answered - oh well.

Ali S:- They're very low powered - it'd be OK on a lake on a still evening, but no good on anything with a flow or a breeze.

Turboducken!

Pop-pop boats! Several members of uk.rec.sheds got together some years ago to race these up and down a trough in a friend's garden. Happy days.
Some home-made, some bought - I've still got one of each somewhere.

My wife's got hardly any navel - she had an outie as a kid but it kept rubbing on clothes so she had it flattened. When she was pregnant the nurses used to come and marvel at the unblemished bump.

Yes, it was largely from learning how useless bailing BL out was that we stopped doing it.
Protectionism (for that's what this is, really) doesn't work for long, eventually the dam breaks.

"270. Stand up to bullies. You’ll only have to do it once."

Yeah, right. My son nearly hospitalised a bully recently, but it hasn't stopped.

The UK hasn't bailed its industries out over the years and is in no better or worse situation from those that have.
Another thing I don't understand is income support. If a job doesn't pay a living wage, why are taxpayers subsidising the employer? We're all going to have to pay in the end, whether through taxes or at the till.

Surely what matters is whether he's any good as a lawyer?

Ah, right. So it's time to build fireproof houses and keep the trees 100 yds back, yes?

What causes this? The view we get most commonly in the UK is that it's caused by putting out small fires so there's a build-up of brush which just piles up and up until you get a BIG fire.

Any truth behind that?

Oh - and good luck.

Just think yourselves lucky Alaska hasn't assumed the right to arm bears.