accept able ▁shock s ▁and ▁excess ive ▁horizontal ▁sh aking ▁in ▁high ▁se as . ▁The ▁R N LI ▁indicated ▁that ▁the ▁project ▁would ▁be ▁extended ▁by ▁at ▁least ▁three ▁more ▁years ▁to ▁research ▁a ▁new ▁h ull ▁shape . ▁ ▁In ▁April ▁ 2 0 0 9 ▁it ▁was ▁announced ▁a ▁new ▁h ull ▁had ▁been ▁chosen . ▁The ▁Sh annon ▁class ▁prototype ▁boat ▁was ▁completed ▁late ▁ 2 0 1 1 ▁when ▁active ▁service ▁was ▁expected ▁to ▁start ▁in ▁mid - 2 0 1 3 . ▁ ▁In ▁April ▁ 2 0 1 1 ▁it ▁was ▁announced ▁the ▁class ▁would ▁be ▁named ▁after ▁the ▁River ▁Sh annon , ▁the ▁longest ▁river ▁in ▁Ireland . ▁This ▁is ▁the ▁first ▁time ▁that ▁the ▁name ▁of ▁an ▁Irish ▁river ▁has ▁been ▁used ▁for ▁a ▁class ▁of ▁R N LI ▁lif eb o at . ▁ ▁After ▁bo aty ard ▁accept ance ▁in ▁March ▁ 2 0 1 2 ▁the ▁first ▁of ▁the ▁fleet ▁went ▁through ▁sea ▁accept ance ▁tri als ▁in ▁ 2 0 1 2 . ▁▁ ▁Early ▁h ull s ▁were ▁m ould ed ▁by ▁S AR ▁Compos ites ▁and ▁up ▁to ▁ON 1 3 1 8 ▁were ▁fitted ▁out ▁by ▁Ber th on ▁Bo at ▁Co . ▁of ▁L ym ington . ▁ ▁From ▁ON 1 3 1 9 ▁fitting - out ▁progress ively ▁switched ▁to ▁the ▁R N LI ▁All - We ather ▁L if eb o at ▁Centre ▁( AL C ) ▁at ▁Po ole , ▁to ▁which ▁h