Finally finished my solar collector prototype.
This has been an ongoing saga for the last six months or so, but with a lot of help from many of you here the Sunflower prototype is finished. And it works! It still needs perfecting, but the principle is sound.
This unit cost me less than $20, is almost entirely recycled and salvaged materials, was ridiculously easy to make (tho since I've thought of a way to make it much simpler) and seems to work fairly well. With a larger collector and light pipe in place this unit alone could collect up to a kilowatt of power, maybe more.
Now I need to start working on the Mk II perfected design, and some applications for electricity generation and water purification.
This will be an ongoing open source project. Once I've got a design which is nice I'll get a website up and be traveling round working with local community groups, inventors and NGOs.
If you have any desire whatsoever to take a crack at making this yourself please please do so. The video is a little light on the finer details, so if there are any questions just ask.
And thanks again for all those who helped out.