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Are there dangers with parabolic solar cookers?

Re "Trainers should be prepared to counteract falsehoods that may be circulated about solar cookers, such as:... they can blind you"

It seems like there would be some possibility for that with parabolic solar cookers. I heard a story about a boy being blinded in the US by a parabolic solar cookers - I googled but can't confirm it.

I don't have experience with this. If someone is turning the parabola in strong sunlight (setting up, a child playing, someone fiddling with it), is there a strong beam that travels with it, or is it only strong if right in the focal point? In which case, the only way I could imagine someone being struck is by sticking their head where the cooking pot should be. Something I could imagine some small children doing (especially if you told them not to).

My inclination has been to say: "Use other forms of solar cookers, not parabolic ones." Over-cautious? What's the perspective of those with more experience?

(I ask because I was looking at Appropedia:Category:Parabolic solar cookers and wondered about caution notices.) --Chriswaterguy 02:46, November 24, 2009 (UTC)

Modern parabolic cookers like the SK14 and the BS-M1 Solar Cooker have a very short focal point (inside the dish) actually to make it very difficult for anyone to blind themselves. Tom Sponheim 18:26, November 24, 2009 (UTC)
Thanks. I'll link this conversation at Appropedia's Village Pump, and suggest that we make a Parabolic solar cooker safety page and link it from all relevant pages. --Chriswaterguy 14:33, November 26, 2009 (UTC)

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