The r/c pilot assit units work like this. The Futaba senses visible light
difference(thus muust see horizon), while the FMA senses IR temp.
difference between the ground and sky. Their demo flight recording
software for the next version displays the angle of the aircraft.

> My understanding is that horizon sensors simply look for
> some line where the IR (or maybe even visible light) radiation changes
> abruptly and consider this as the horizon. I could be wrong on this
> one, though, too.




Michiana R/C Choppers
http://www.mrcc.info
miked@mrcc.info

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu