How an Attitude Indicator Works

The author of X-Plane has posted a stream-of-conciousness piece about their journey towards turning an iPad into an attitude indicator.
Some interesting notes about how a mechanical attitude indicator works, and some troubles trying to determine what direction is ‘up’ in a non-inertial reference frame.
Long story short it is probably close to what you might guess, but a little more complicated once you account for gyro drift.

Worth a read.

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