▁sun light ▁must ▁be ▁painted ▁white ▁except ▁of ▁( s ic ) ▁wing ▁tips , ▁nose ▁of ▁fus el age ▁and ▁rud der ." ▁ ▁In ▁March ▁ 1 9 8 7 ▁an ▁improved ▁variant ▁was ▁developed ▁by ▁Di eter ▁Kö h ler ▁and ▁the ▁subsequent ▁H K 3 6 R ▁first ▁fle w ▁with ▁a ▁Lim bach ▁L 2 4 0 0 ▁engine ▁in ▁October ▁ 1 9 8 9 . ▁ ▁When ▁equ ipped ▁with ▁the ▁larger ▁available ▁engines , ▁particularly ▁the ▁ ▁Rot ax ▁ 9 1 4 ▁tur bo charg ed ▁power plant , ▁the ▁aircraft ▁can ▁be ▁used ▁for ▁gl ider ▁to wing . ▁A ▁commercial ▁success , ▁more ▁than ▁ 9 0 0 ▁H 3 6 s ▁and ▁H K 3 6 s ▁have ▁been ▁completed . ▁ ▁The ▁H K 3 6 ▁provided ▁the ▁basis ▁from ▁which ▁the ▁Diam ond ▁D V 2 0 ▁Kat ana ▁from ▁which ▁the ▁improved ▁DA 2 0 ▁and ▁four - se at ▁DA 4 0 ▁series ▁were ▁later ▁developed . ▁ ▁Oper ational ▁history ▁In ▁ 1 9 9 1 , ▁an ▁H K 3 6 , ▁flow n ▁by ▁Peter ▁U rach ▁in ▁Austria , ▁set ▁an ▁absolute ▁alt itude ▁record ▁in ▁its ▁class ▁for ▁a ▁p ist on ▁eng ined ▁aircraft ▁of ▁. ▁The ▁record ▁held ▁until ▁sur pass ed ▁in ▁ 2 0 0 2 ▁by ▁the ▁Boh annon ▁B - 1 . ▁ ▁The ▁F CD ▁( F uel ▁Cell ▁Dem on str ator ) ▁was