▁dies el ▁engines , ▁each ▁driving ▁one ▁prop eller ▁sh aft . ▁When ▁sub mer ged ▁each ▁prop eller ▁was ▁driven ▁by ▁a ▁ ▁electric ▁motor . ▁They ▁could ▁reach ▁ ▁on ▁the ▁surface ▁and ▁ ▁under water . ▁On ▁the ▁surface , ▁the ▁L ▁class ▁had ▁a ▁range ▁of ▁ ▁at ▁. ▁ ▁The ▁boats ▁were ▁armed ▁with ▁four ▁ 2 1 - inch ▁tor ped o ▁tub es ▁in ▁the ▁bow ▁and ▁two ▁ 1 8 - inch ▁( 4 5   cm ) ▁in ▁broad side ▁mount s . ▁They ▁carried ▁four ▁reload ▁tor ped o es ▁for ▁the ▁ 2 1 - inch ▁tub es ▁for ▁a ▁grand ▁total ▁of ▁ten ▁tor ped o es ▁of ▁all ▁sizes . ▁They ▁were ▁also ▁armed ▁with ▁a ▁ ▁deck ▁gun . ▁L 1 7 ▁was ▁fitted ▁with ▁ 1 6 ▁vertical ▁mine ▁ch utes ▁in ▁her ▁s addle ▁t anks ▁and ▁carried ▁one ▁mine ▁per ▁ch ute . ▁ ▁Const ruction ▁and ▁career ▁HMS ▁L 1 7 ▁was ▁built ▁by ▁V ick ers , ▁Bar row - in - F urn ess . ▁She ▁was ▁laid ▁down ▁on ▁ 2 4 ▁January ▁ 1 9 1 7 ▁and ▁commission ed ▁on ▁an ▁unknown ▁date . ▁The ▁boat ▁was ▁sold ▁in ▁February ▁ 1 9 3 4 ▁at ▁P embro ke ▁D ock . ▁ ▁Notes ▁ ▁References ▁▁▁▁▁▁ ▁Category : B rit ish ▁L - class ▁sub mar ines ▁Category : Sh ips ▁built ▁in ▁Bar row - in - F