Dear Jonkman,
I have reading some tropics in this forum about ADAMSPrep. After reading your reply, I realize the result of Winpac 1.5MW wind turbine by ADAMS in Tower fore-aft modes shapes - #9 by Jason.Jonkman. But if i want to use ADAMS to calculate mass moment of inertia, i have to set ADAMSPrep to 2 or 3 in FAST V7, which dosen’t have NREL 5MW wind turbine modle. In FAST V8 and OPENFAST I have not fine ADAMSPrep switch. So i want to know, did you calculate NREL 5MW’s mass moment of inertia by modeling a new model in ADAMS or in FAST V7?
Best regards 
Jiantao