For lambdaMin <= lambda <= lambdaMax the pitch angle beta is approximated by a polynom

  beta = sum (lambda^(n-k+1) * p[k] for k in 1:n)

where n-1 is the degree of the polynom. The optimum power coefficient is indicated by beta = betaOpt and lambda = lambdaOpt.

The polynominal parameters can be calculated by the Octave script OpenModelicaOpenModelica 1.16.0~dev-420-gc007a39 using GenerateDoc.mos