# Horizontal wind profile

**URL:** <https://forums.nlr.gov/t/horizontal-wind-profile/2420>\
**Category:** Inflow Turbulence\
**Created:** [March 9, 2021, 10:30am UTC](https://forums.nlr.gov/t/horizontal-wind-profile/2420 "2021-03-09T10:30:58Z")\
**Posts on this page:** 1\
**Page:** 2

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**Author:** ![Jason.Jonkman](https://dub1.discourse-cdn.com/nrel/user_avatar/forums.nlr.gov/jason.jonkman/32/3086_2.png) [@Jason.Jonkman](https://forums.nlr.gov/u/Jason.Jonkman)\
**Post date:** [December 9, 2021, 1:39pm UTC](https://forums.nlr.gov/t/horizontal-wind-profile/2420/21 "2021-12-09T13:39:26Z")

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Dear Kevin,

Ah, I understand now. As discussed many times on this forum, the RotThrust output includes not only the applied aerodynamic loads, but also the contribution from weight/inertia of the rotor along the shaft axis. In your case, you have a 5-deg shaft tilt, so, the weight of the rotor yields a mean value of 94 kN along the shaft axis in the absence of aerodynamic loads. You could mostly eliminate this by setting the shaft tilt to zero (ShftTilt = 0), but the tower deflection from the enabled tower DOFs will also impact the tilt of the shaft a bit.

Best regards,

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