Q. How do I get the power and thrust curves?
A. The thrust coefficient curve can be established by measurements on the turbine or by modeling the turbine and rotor system. This is a fairly comprehensive task, so in practice you simply get the curves from the manufacturer of the turbine in question. Remember to specify the environmental conditions for your site (air density, noise requirements), and then ask for the corresponding power and thrust curves. The *.pow file can then easily be established using a text editor like Notepad or WordPad. The *.wtg file can be established using the WAsP Turbine Editor. The thrust curve is only important for the wake modelling in a wind farm. For some standard turbines, the power- and thrust-curves can be found in the WAsP library.
Q. Why does WAsP and related tools refuse to import my *.wtg file?
A. You are probably trying to open a WindPro *.wtg which has a different format. The WAsP *.wtg is in ASCII XML format and the file size is typically smaller than that of the binary WindPro *.wtg. A WindPro *.wtg filename often, but not always, includes exclamation marks as in "VESTAS V90 2000 90.0 !O!.wtg"