#13 (Oct 16, 2017, 9:34:12 AM)

1. fix segment weight and section modulus constraints (commit: b22d33f) (details / githubweb)
2. fix cmac calculation (commit: efb4eb8) (details / githubweb)
3. correct MAC calc (commit: 0b60bbe) (details / githubweb)
4. delete old cbar call (commit: 3e26eb5) (details / githubweb)
5. initial attempt to breakdown surface and wing model (commit: b6a9610) (details / githubweb)
6. move components from aerosurf to wing (commit: 3e3400b) (details / githubweb)
7. move spar global constraints to wing model (commit: fd2626b) (details / githubweb)
8. move wingskin constraints to global level (commit: b095621) (details / githubweb)
9. move foam constraints to higher level (commit: 3580485) (details / githubweb)
10. sub in wing shape params at wing level (commit: 3aa0b1b) (details / githubweb)
11. return deta from cbar and sub into wing (commit: 58f0d3a) (details / githubweb)
12. fix pylint errors (commit: 883e1c3) (details / githubweb)
13. create horizontal tail using aero surf (commit: 9158380) (details / githubweb)
14. use aerosurf to make vertical tail (commit: e4f9ebd) (details / githubweb)
15. fix pylint errors (commit: 95b12e7) (details / githubweb)
16. delete flight_model method (commit: c43fe50) (details / githubweb)
17. make surface an input to spar (commit: 7e92c2c) (details / githubweb)
18. make surface input to wing_skin (commit: 80f0691) (details / githubweb)
19. add surface to arguments for skin and foam models (commit: 328d5c7) (details / githubweb)
20. add box spar model (commit: ba05a3e) (details / githubweb)
21. modularize wing class for htail and vtail use (commit: 79d9c36) (details / githubweb)
22. add AR to substitutions (commit: 84ccb7c) (details / githubweb)
23. update tau substitutions (commit: c6da5c0) (details / githubweb)
24. change mfac substitutions in vtail and htail (commit: fc071b7) (details / githubweb)
25. put derived variable for cbarmac (commit: 5b9840e) (details / githubweb)
26. move eta (commit: b02def3) (details / githubweb)
27. change name to wing; and fix SP wing model (commit: 1f55f19) (details / githubweb)
28. delete unnecessary imports; add lines to EOF; fix variable descrp typo (commit: a0e73f0) (details / githubweb)

GitHub pull request #122 of commit 9e201b4ce9e91cc744b13258b03be78f3a976a21, no merge conflicts.