On Monday, April 20, 2015 at 6:35:42 PM UTC-5, son_of_flubber wrote:
On Monday, April 20, 2015 at 1:55:12 PM UTC-4, wrote:
why not have one of these:

http://store-vllhq23n.mybigcommerce....-in-enclosure/
http://store-vllhq23n.mybigcommerce....dback-systems/

'Wings level upright' and 'wings level inverted' gives the same reading on this instrument.

So? You'll never get wings-level-inverted if you are paying attention to the readout. How do you think Lindbergh got across the Atlantic?

S