Curtis L. Olson wrote: > James Turner wrote: > > Now, the problem is that such systems (as far as I can tell) expect to > > drive a CDI bar on the HSI based on distance (in nm) off course. So, I > > have two problems: > > Someone correct me if I'm wrong, but my understanding is that the > needle deflection is relative to how many degrees you are off > course.
I think you're both right. For older equipment (i.e. without a in-receiver microcontroller, or without DME), all the HSI can do is display angular deviation. That's all you can get from the VOR signal alone. With DME, a computer could construct an off-course distance, of course. But until the middle 1980's, mechanical HSIs in GA planes couldn't possibly have had computers. Newer HSIs that are driven by RNAV or GPS engines don't have this limitation, and I'm pretty sure they display distance generically. Someone correct me if I'm wrong. Andy -- Andrew J. Ross NextBus Information Systems Senior Software Engineer Emeryville, CA [EMAIL PROTECTED] http://www.nextbus.com "Men go crazy in conflagrations. They only get better one by one." - Sting (misquoted) _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
