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<t>I have thought of the fresnel approach with all the little mirrors but what I suspect is that it would be less efficient than a dish of comparable area. Maybe would still get plenty of energy, but more is better. due to the loss of light intensity as it travels from the flat mirrors to the focal ...

<t>I have thought of the fresnel approach with all the little mirrors but what I suspect is that it would be less efficient than a dish of comparable area. Maybe would still get plenty of energy, but more is better. due to the loss of light intensity as it travels from the flat mirrors to the focal ...

BTW, for small dishes, I love that drum procedure. I would tweak it a little but it is perfect simplicity and I love that...

BTW, for small dishes, I love that drum procedure. I would tweak it a little but it is perfect simplicity and I love that...

<t>sorry that the link is dead now...<br/> <br/> A sheetrock square and a piece of string no longer than 8 ft... Attach one end of the string to the tip of the long leg of the square. get a rigid piece of 4'x8' material. If you mark a point at the center of the long side and put a nail there to atta...

<t>sorry that the link is dead now...<br/> <br/> A sheetrock square and a piece of string no longer than 8 ft... Attach one end of the string to the tip of the long leg of the square. get a rigid piece of 4'x8' material. If you mark a point at the center of the long side and put a nail there to atta...

<r><URL url="http://www.cc.jyu.fi/~hvirtane/cooker/node8.html">http://www.cc.jyu.fi/~hvirtane/cooker/node8.html</URL><br/> <br/> this link shows how to simply create a perfect parabolic curve on a flat piece of rigid material (ie plywood) that you could then use to create a form for the dish by rota...

<r><URL url="http://www.cc.jyu.fi/~hvirtane/cooker/node8.html">http://www.cc.jyu.fi/~hvirtane/cooker/node8.html</URL><br/> <br/> this link shows how to simply create a perfect parabolic curve on a flat piece of rigid material (ie plywood) that you could then use to create a form for the dish by rota...