This is very good information to have at one place.
Thanks for posting it.
How wouldit apply if you were making a butterfly parabolic cooker where the reflector is split into two side plates?
Ashokchand2000 05:06, April 29, 2012 (UTC)
butterfly wings (reply) Edit
If the exact shape of the wings is known, in mathematical terms, then it is theoretically possible to calculate the condition for them to be focus-balanced. The condition would not, in general, be the same as for the paraboloidal dish for which I did my calculation.
An easier approach might be to make the wings, determine their centre of mass and focal point by experiment, then attach weights to them to make them focus-balanced.
David Williams DOwenWilliams 15:23, April 29, 2012 (UTC)