Unfortunately, I received a response back from Professor Sturges who wrote this:
Publishers provide solutions manuals to faculty who use a book to
teach a class. Solution manuals provided in this manner are given
free of charge. Most publishers do not sell solution manuals. Many
faculty refuse to use a book in their classes if they feel that a
solution manual has been distributed too widely or otherwise
compromised (stolen from faculty offices by students).
Your only recourse left in terms of finding a solutions manual is to
purchase the chapters 7-11 solutions manual that I've found on Amazon
Used Books, or try to contact Wiley Publishing yourself and somehow
prove that you are not a student in a class which uses this book. I
understand how frustrating it is to try to learn by worked out
examples if you don't have the full solutions instead of just the
answer to only the odd problems as is in most of college level texts.
I have included below links to the used book sale, as well as contact
information for Wiley to inquire about purchasing a solutions manual
directly. You might be able to tell Wiley Publishing that you are
going to use the solutions manual for your own educational benefit,
and that may give you some advantage when asking. Again, I hope that
just chapters 7-11 solutions will be sufficient for your question, and
I know of no other means to procure a copy for you.
"Brand new off shelf, solutions to chapter 7-11 of Engineering mechanics statics":
1-800-CALL-WILEY or try their Higher Education Customer Care feedback form:
Thank you for your question, and I hope I've helped you somewhat, even
if you're missing two three chapters of solutions.