Ghengis wrote:
ProfChrisReed is incorrect in stating that Vne is declared in TAS; it is, like most other V speeds, normally declared in IAS. However, if it is determined by flutter onset, then this is a function of TAS, for which reason it may be necessary in some aeroplanes to vary Vne with altitude. This isn't however often done, in which regard, I think that many of the engineers certifying gliders are probably also wrong.
Interesting - I wasn't aware of that, so thanks.
The UK glider training tells us to treat Vne as a TAS value because of the flutter risks, which must be why I thought that was how it was as standard expressed. This is contrasted in the training with Vs, which we are told remains the same as an IAS irrespective of altitude.