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Re: questions about reference control input

Posted: Sat Jul 13, 2019 6:33 am
by Jason.Jonkman
Dear Kumara,

When looking from the root to the tip, the positive pitch and twist angles in FAST are counter-clockwise rotations from the rotor plane to the chord about the pitch axis.

Best regards,

Re: questions about reference control input

Posted: Mon Jul 15, 2019 1:14 am
by KumaraRaja.Eedara
Thanks, Jason. That is helpful. Basically clock-wise rotations about -z axis of blade coordinate system (Fig 9, pg 10 FAST manual) are positive (for both pitch and twist). For an up-wind turbine such a rotation causes leading edge more into upwind.