Vne is not always an airframe limitation. Under FAR 23.33 (U.S. regs),
the propeller speed should remain within 110% of the max rpm at Vne. I
know that the Diamond Katana aircraft had such a Vne. It had nothing to
do with the airframe. Also, experimentals do not have to comply with
Part 23, and for that matter, I don't think there is any requirement to
even have a Vne.
Even in the case of airframe-limited Vne, it may not be a load factor
limit. The 3.8G someone else mentioned is for Va. Vne could be, for
example, the speed at which the windows blow out; or the antennas get
ripped out. It may have little to do with wing loading.
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