ten kap it än ▁E ber hard ▁Hoff mann ▁in ▁command , ▁she ▁was ▁assigned ▁from ▁then ▁until ▁ 1 ▁July ▁to ▁the ▁ 3 rd ▁U - bo at ▁Fl ot illa ▁for ▁training , ▁and ▁from ▁ 1 ▁July ▁ 1 9 4 1 ▁to ▁ 2 1 ▁December , ▁she ▁remained ▁with ▁the ▁ 3 rd ▁fl ot illa ▁for ▁operations . ▁ ▁She ▁carried ▁out ▁four ▁pat rol s ▁before ▁being ▁lost ▁in ▁action . ▁ ▁Design ▁German ▁Type ▁VII C ▁sub mar ines ▁were ▁preced ed ▁by ▁the ▁shorter ▁Type ▁VII B ▁sub mar ines . ▁U - 4 5 1 ▁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 ▁Germania wer ft ▁F 4 6 ▁four - stroke , ▁six - cy l inder ▁super charg ed ▁dies el ▁engines ▁producing ▁a ▁total ▁of ▁ ▁for ▁use ▁while ▁sur fac ed , ▁two ▁Brown , ▁B over i ▁& ▁C ie ▁G G ▁U B ▁ 7 2 0 / 8 ▁double - act ing ▁electric ▁mot ors ▁producing ▁a ▁total ▁of ▁ ▁for ▁use ▁while ▁sub mer ged . ▁She ▁had ▁two ▁sh aft s ▁and ▁two ▁ ▁prop ellers . ▁The ▁boat ▁was ▁capable ▁of ▁operating ▁at ▁depth s ▁of