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The screw thingy is the wrong way round and facing the wrong direction... ?
The two screws push snow towards the middle if spinning counterclock from the rhs as we see it - it then gets scooped up by the central thing and thrown everywhere? But then I have no idea what its meant to do.
es, that's how it works. The screw thing is called the auger and it feeds snow to the impeller. The impeller then chucks the snow out a hole in the top. There is a chute thing (not installed in the piccy) that goes on top to send the snow in the desired direction.
See I had no idea that was how it worked, hence me thinking it was on the wrong way. I thought it was meant to be more like an Archimedes screw. But thank you for the heart. 
I am still not entirely sure how dragging the snow to the centre helps.... I thought the idea was to push it aside? But I bow to your engineering/mechanical/blokey experience. 
See, the whole bag of tricks goes on the back of a tractor, and you reverse the tractor into the snow. While you are doing that, the two archiwotsit things are dragging the snow towards the center where it gets dumped into the thingy at the back there that's spinning around rather fast. As it spins, it chucks the snow up (I suppose it's really an up-chucker) the chute (not in the picture) and sent off towards your neighbour's driveway.
You can get one that goes on the front of the tractor, though most that I have seen need a power supply from a hydraulic pump to run them, as no tractor I have seen has a front PTO.
the Aussies are suffering from Al Gore's warming
Quote from: SeanB on 22/12/2010 10:59:44the Aussies are suffering from Al Gore's warmingTrue, but at least he invented the Aussie Internet!