M B wrote:

Neither this report nor the Minden report it references
mentions anything about the ASI installed.

Were they the wrap-around types which cause
the pilot to not know if the glider is in a spin or
a spiral?

I understand you're an instructor? I shudder at the thought that a
licensed pilot, let alone an instructor would rely on the ASI to tell
whether he's in a spin or a spiral.

Stefan