This discussion is veering awfully close to transforming into this question; "Is partial-panel flight, i.e. flight in clouds with a turn rate indicator but no artificial horizon instrument, even possible?"

I think that's been settled...

On Monday, April 20, 2015 at 11:43:17 PM UTC-5, wrote:
Let's not lose sight of the fact that the history of soaring includes many many hundreds or thousands of hours, collectively, of flying in clouds with the aid of a turn rate indicator and no artificial horizon.

S