# AeroDyn Outputs

**URL:** <https://forums.nlr.gov/t/aerodyn-outputs/392>\
**Category:** Computer-Aided Engineering Software Tools\
**Created:** [August 22, 2011, 5:56pm UTC](https://forums.nlr.gov/t/aerodyn-outputs/392 "2011-08-22T17:56:18Z")\
**Posts on this page:** 2\
**Page:** 2

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**Author:** ![Tianhui.Liu](https://avatars.discourse-cdn.com/v4/letter/t/ebca7d/32.png) [@Tianhui.Liu](https://forums.nlr.gov/u/Tianhui.Liu)\
**Post date:** [May 10, 2023, 9:05am UTC](https://forums.nlr.gov/t/aerodyn-outputs/392/21 "2023-05-10T09:05:03Z")

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Dear Jason

Thank you very much for your answer， but there seems to be no formula for calculating inertia loads in the topic you provided.  
If I understand you correctly the inertial load is the mass of the rotor times the acceleration at the top of the tower

Best regard

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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:** [May 10, 2023, 9:18am UTC](https://forums.nlr.gov/t/aerodyn-outputs/392/22 "2023-05-10T09:18:59Z")

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Dear @Tianhui.Liu,

Yes, that is correct for a rigid rotor, but for a flexible rotor, the calculation of inertial loads is tied to other system states as a byproduct of the system equations of motion.

Best regards,

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