On Tuesday, February 26, 2013 1:11:34 AM UTC-5, Alan wrote:

I would agree and disagree with Dan about this. Obvious reasons
include expense (gyros are expensive), weight, and power.

Here is a relatively inexpensive, low-maintenance, non-gyro based, and low power consuming Turn and Bank Indicator (that claims to be much easier to use than the old style).

http://www.trutrakflightsystems.com/..._and_Bank.html