Dale Larsen wrote:

As I see it, accelerometers and GPS together are all that's needed. If the
vectors from all 3 accelerometers are in the right direction, and the
average GPS heading is not moving much- you're straight and level.


Ron-Using accelerometers in 3d space will soon become inaccurate due to
small errors in the accelerometers, math rounding errors and drift. How do
you propose to 'erect' such a device to keep the shiny side up?


Add a VG.... let's see the second integral....
OK, too complicated...keep a cat in the cockpit, periodically drop it on
the floor, since cats always land feet first.....
No, cats tend to get cranky when you do that.....

Dan, U.S. Air Force, retired