Jim wrote:

So, I have always considered it prudent to view VNE due to FLUTTER
to be a TAS airspeed, not an IAS airspeed.

Have I been wrong about this?

No, it is prudent, but as several have pointed out, it may be
unnecessarily conservative. That's because the flutter usually occurs
somewhere between IAS and TAS, and not strictly by TAS.

Personally, I'd use TAS on "older" (designed/certified 20+ years ago)
gliders, and the glider's handbook for "newer" (designed/certified
within the last 10 or so years, unless I knew specifically what the
older glider was designed and tested to. My reasoning is the older
certifications were not as stringent in this area as they are now.

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Eric Greenwell
Washington State
USA