[cheunste]

I worked in the wind industry for a number of years and I have never heard of anyone used the term "survivable speed" before.

[jacquesm]

That's funny, because I've designed a windmill from scratch and plenty of the literature used that term.

I just checked Google to see if I'm mistaken but even the Wikipedia page on wind turbine design uses it:

https://en.wikipedia.org/wiki/Wind_turbine_design

"For a given survivable wind speed, the mass of a turbine is approximately proportional to the cube of its blade-length."

So I'm not sure why you've never heard that term but it definitely is in use.

[strainer]

I don't believe its a term in general use in the industry (of large wind turbines). Since "survivable" means "might survive" - that's not a very useful engineering target. Wind turbines have to be rated to reliably withstand specific gust speeds, so talk of certain speeds being "survivable" should be non-technical.

Afaik modern turbines are specified to reliably withstand an "extreme 50 year gust" estimated by their locales "Wind Class" [1] Some headroom is likely as with all large constuctions, building, bridges.. The matter of what stronger gust speeds might be survivable by the majority of installations is not specified.

[1] https://en.wikipedia.org/wiki/IEC_61400

[nitrogen]

Did they call it something else? It's the concept that matters, not the exact phrasing. Every structure, windmill or otherwise, has a wind speed at which it will break apart, possibly even if not rotating. It seems important to know what that speed is.

[jacquesm]

It is a very important figure and it works its way into many of the design details of the turbine as well as the tower and the foundation, if it was called something else I'd like to know what it was called as well as what kind of role GP had in the industry.

[excalibur]

That might actually be more concerning, it suggests that much of the industry doesn't give the topic much thought.

[jacquesm]

The wind energy industry gives this sort of thing a lot of thought. I think it says more about the GPs exposure to particular literature and theory than it does about the industry as a whole, also, whatever companie(s) they worked for may have simply used different terminology, it would be interesting to know what term they did use rather than to extrapolate large and unsupported conclusions from a comment like this.