▁and ▁s unk ▁by ▁mine ▁ 9 ▁September ▁ 1 9 1 8 . ▁ ▁Design ▁German ▁Type ▁U ▁ 8 7 ▁sub mar ines ▁were ▁preced ed ▁by ▁the ▁shorter ▁Type ▁U ▁ 8 1 ▁sub mar ines . ▁U - 9 2 ▁had ▁a ▁disp lacement ▁of ▁ ▁when ▁at ▁the ▁surface ▁and ▁ ▁while ▁sub mer ged . ▁She ▁had ▁a ▁total ▁length ▁of ▁, ▁a ▁pressure ▁h ull ▁length ▁of ▁, ▁a ▁beam ▁of ▁, ▁a ▁height ▁of ▁, ▁and ▁a ▁dra ug ht ▁of ▁. ▁The ▁sub marine ▁was ▁power ed ▁by ▁two ▁ ▁engines ▁for ▁use ▁while ▁sur fac ed , ▁and ▁two ▁ ▁engines ▁for ▁use ▁while ▁sub mer ged . ▁She ▁had ▁two ▁prop eller ▁sh aft s . ▁She ▁was ▁capable ▁of ▁operating ▁at ▁depth s ▁of ▁up ▁to ▁. ▁ ▁The ▁sub marine ▁had ▁a ▁maximum ▁surface ▁speed ▁of ▁ ▁and ▁a ▁maximum ▁sub mer ged ▁speed ▁of ▁. ▁When ▁sub mer ged , ▁she ▁could ▁operate ▁for ▁ ▁at ▁; ▁when ▁sur fac ed , ▁she ▁could ▁travel ▁ ▁at ▁. ▁U - 9 2 ▁was ▁fitted ▁with ▁four ▁ ▁tor ped o ▁tub es ▁( two ▁at ▁the ▁bow ▁and ▁two ▁at ▁the ▁stern ), ▁ten ▁to ▁twelve ▁tor ped o es , ▁N D ▁one ▁ ▁SK ▁L / 4 5 ▁deck ▁gun . ▁She ▁had ▁a ▁complement ▁of ▁thirty - six ▁( th irty - two ▁crew ▁members ▁and ▁four ▁officers ). ▁ ▁Oper ations ▁ ▁After ▁accept ance