ers ▁went ▁under ▁in ▁the ▁late ▁ 8 0 s . ▁ ▁Biography ▁O ls en ▁was ▁born ▁in ▁ 1 9 1 9 ▁in ▁Pr æ st ø , ▁Den mark . ▁In ▁ 1 9 3 9 , ▁he ▁and ▁his ▁brother , ▁B j ør n , ▁formed ▁a ▁boat building ▁business ▁and ▁designed ▁and ▁built ▁several ▁boats ▁until ▁a ▁short age ▁of ▁boat building ▁material ▁caused ▁by ▁World ▁War ▁II ▁ended ▁the ▁business . ▁In ▁the ▁early ▁ 1 9 5 0 s , ▁he ▁joined ▁the ▁Dan ish ▁company , ▁A . ▁P . ▁Bot ved , ▁who ▁were ▁producing ▁speed bo ats , ▁and ▁worked ▁there ▁until ▁he ▁started ▁his ▁own ▁business ▁in ▁Band holm ▁in ▁ 1 9 6 1 . ▁He ▁designed ▁and ▁built ▁a ▁number ▁of ▁boats ▁including ▁the ▁Band holm ▁ 2 6 , ▁the ▁Bian ca ▁ 2 7 ▁and ▁the ▁Great ▁D ane ▁ 2 8 , ▁which ▁were ▁the ▁first ▁Dan ish ▁boats ▁to ▁be ▁built ▁using ▁fib reg lass ▁h ull s , ▁the ▁Band holm ▁ 2 0 , ▁Band holm ▁ 3 0 , ▁the ▁Mar ib o at ▁and ▁the ▁Band holm ▁ 2 4 . ▁ ▁In ▁ 1 9 5 6 , ▁Dan ish ▁architect , ▁Ax el ▁Dam ga ard ▁O ls en , ▁asked ▁O ls en ▁to ▁create ▁a ▁design ▁for ▁a ▁light , ▁fast , ▁single - hand ed ▁sail ing ▁d ing hy ▁that ▁could ▁be ▁built ▁and ▁sa