# MIT NREL TLP with inclined tendons **URL:** \ **Category:** Computer-Aided Engineering Software Tools\ **Created:** [June 29, 2021, 4:02pm UTC](https://forums.nlr.gov/t/mit-nrel-tlp-with-inclined-tendons/2497 "2021-06-29T16:02:50Z")\ **Posts on this page:** 1\ **Showing post:** 3
**Author:** ![Mustafa.Vardaroglu](https://avatars.discourse-cdn.com/v4/letter/m/e19b73/32.png) [@Mustafa.Vardaroglu](https://forums.nlr.gov/u/Mustafa.Vardaroglu)\ **Post date:** [June 30, 2021, 3:55pm UTC](https://forums.nlr.gov/t/mit-nrel-tlp-with-inclined-tendons/2497/3 "2021-06-30T15:55:46Z")
Dear Jason, Thanks again for sharing your time and help. I should add that I calculated the mooring stiffness matrix with the python wrapper as it was discussed here before: [url][Mooring stiffness matrix](http://forums.nlr.gov/t/mooring-stiffness-matrix/1825/1)]. I run Static\_Configuration.py with 1.0 m of surge displacement and I compare with my hand calculation. Mooring stiffness values match pretty close for all the components. I have just tried your advise and run FAST model with MAP++ instead of MoorDyn. As you were expecting, FAST model with MAP++ also results with the same natural period in surge as 61.0 seconds (MAP++ and other input files are added). The surge period that I hand calculate is 41 seconds. Mass and added mass values are the same for the inclined and reference model. I am also adding spreadsheet calculations, where you can see my computations. I should also add that I have added the pontoons to the MIT/NREL TLP so I don’t have precisely the same MIT/NREL TLP that Denis Matha described in his thesis work (NREL/SR-500-45891) Sincerely, Mustafa [V\_5.rar](https://forums.nlr.gov/uploads/short-url/gFg2eIYTWHfdnkuvKlDuo2RCSoo.rar) (15.4 KB) [Parametric5.xlsx](https://forums.nlr.gov/uploads/short-url/xTH3f6mbmuoOv9hJyuIem8Hgp96.xlsx) (886 KB) --- _[View the full topic](https://forums.nlr.gov/t/mit-nrel-tlp-with-inclined-tendons/2497)._