What is actually going to work

What is not feasible on a cost basis is any large contraption needing concrete and steel such as http://www.youtube.com/watch?v=CXJgAmft2jI&feature=player_embedded#! (Solarfire) and the Teton engineering furnace of 4x4m from SolarLinks. http://www.youtube.com/watch?v=1RNNlYiKxlc&feature=relmfu are 2m diameter mirrors, but about eight of these is needed focused on a thermal element to produce significant electricity from a steam engine or Energy_Links. Parabolic mirrors won't work due to excessive wind loading rising exponentially with size. Heliostat Fresnel mirror arrays is the solution, allowing wind to pass between the individual square mirrors. Over four tons of concrete would be needed to stabilize a 16square meter parabolic and one ton of concrete to stabilize a 4x4m Teton FMA - SolarLinks.

To power a 3hp steam engine, you would need to focus the thermal sun energy over 16 square meters at least on a thermal element of 30x30cm. How to focus all that thermal energy(16kwH) down to small boiler cost effectively has been insurmountable, with hundreds of patents(most ineffective) trying to address this problem.

The only cost effective means(no steel and concrete) to concentrate a large 16square meter area of sunlight on a 30cm thermal element is combining the ideas from Solarfire and SolarLinks with the insight from http://www.rossen.ch/solar/miniheliostatfaq.html.

He came to the conclusion that instead of mounting a 2x2m mirror Fresnel array(36 square mirrors of 30cm each side) on an expensive steel and concrete base, each mirror is mounted on a plastic geared ring on the ground, all of them focusing on a mini solar tower(4m),which can scale to 100 square meters(10x10). Nine or more mirrors in a row are connected with a long rod and spaced gear element turning all mirrors in the same fashion. One small motor can turn many such mirrors in a row. The details are trivial to work out for a consulting mechanical engineer or student, this is the easy part. To reduce the wind loading on a 30x30cm square mirror even further, it can be divided into four mirrors all focusing on the same thermal element as per Teton engineering from SolarLinks. In most cases 30x30cm would provide very little wind loading.

What makes the http://www.rosse.ch idea so innovative is that it exceeds the best patented commercial solutions and can't itself be patented. There is too much prior art.