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
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