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  1. L

    Looking for a critique: reactive black body radiation device

    It's a blackbody radiation heat exchanger that controls the radiation exchange through a central focus. It is definitely a cooling system and maybe a heating one. Either way it collects radiation from outerspace and modulates it to the level of radiation expelled by an enclosed volume.
  2. L

    Looking for a critique: reactive black body radiation device

    I want to get a half convex lens (thick in the middle, flat on one side). And coat it in thermally and optically reactive transition filters. They are to be segmented so to reduce spread of filtering. This will give a view of the sky with any bright light inhibited at the focus. Next to the...
  3. L

    Water/land detection/differentiation from a quadcopter

    Good point. To which I cannot get an exact answer. They do not mention it. Many of the fishfinders pair via bluetooth. Some of them you have to manually set their depth so that it improves the quality of image.
  4. L

    Water/land detection/differentiation from a quadcopter

    The idea is to suspend a fish finder below it, you can currently get castable fish finders. Then drag it across the beach head and get a rough idea of where the fish are. There will be a issues with drift of the buoy, it would be quite convoluted to get the drone to compensate for this with...
  5. L

    Water/land detection/differentiation from a quadcopter

    Hello, I want to have a quadcopter drone type set up which can tell how far from land it is. I would go for GPS but I want it to take into consideration the tide, and in general I'm only talking a distance of 50-200m (within shore fishing distance). The ideal system would be a drone that can...
  6. L

    Where would you buy carbon nanotubes?

    want them for this project http://www.halfbakery.com/idea/carbon_20nano_20tube_20composite_20electret#1386474886
  7. L

    Where would you buy carbon nanotubes?

    Wouldn't have to be long ones. Cheap and cheerful amounts. A google search brought up one called cheaptubes.com, any one had experience with them?
  8. L

    Reverse solar trap

    So, after a bt of googling. This turns out to exist. A cold mirror http://en.wikipedia.org/wiki/Cold_mirror Although, they don't quite cover the spectrum that would be optimal, the limit currently for commerical mirrors is up to 2500nm,This is usually layered dialectric coatings...
  9. L

    Reverse solar trap

    found this http://www.ispoptics.com/Images/MaterialChart.gif Germanium seems a good candidate, for a better view http://rmico.com/technical-notes/bk7-quartz-ge-si [Broken] in particular based on this calculator http://www.calctool.org/CALC/phys/p_thermo/wien peak...
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    Reverse solar trap

    I've been thinking about this on and off for awhile now. It first started with the idea of a solar trap. Solar trap being something like having a solar collector focusing light on a container of water, having an infra red barrier around the container, and a black body at the centre. Incoming...
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