▁cant ile ver , ▁single ▁engine , ▁conventional ▁landing ▁g ear ▁ul tr al ight ▁aircraft ▁that ▁was ▁designed ▁by ▁Stephen ▁K . ▁Wood ▁of ▁White water , ▁Colorado ▁for ▁amateur ▁construction . ▁ ▁Design ▁and ▁development ▁Int rodu ced ▁in ▁ 1 9 8 2 , ▁the ▁Sky ▁P up ▁is ▁a ▁single ▁se ater ▁designed ▁as ▁an ▁F AR ▁ 1 0 3 ▁Ul tr al ight ▁Ve h icles ▁comp li ant ▁aircraft ▁with ▁an ▁empty ▁weight ▁within ▁that ▁category ' s ▁ ▁empty ▁weight ▁limit . ▁The ▁aircraft ▁was ▁intended ▁to ▁require ▁the ▁minimum ▁financial ▁invest ment ▁and ▁the ▁designer ▁intended ▁that ▁the ▁air frame ▁would ▁be ▁able ▁to ▁be ▁completed ▁for ▁US $ 1 0 0 0 ▁using ▁locally ▁available ▁materials . ▁C liche ▁reported ▁in ▁ 2 0 0 1 ▁that ▁Sky ▁Pu ps ▁had ▁been ▁ ▁completed ▁for ▁US $ 2 0 0 0 , ▁including ▁the ▁engine . ▁ ▁The ▁aircraft ▁fus el age ▁and ▁wings ▁are ▁constructed ▁from ▁epo xy - gl ued ▁Douglas ▁fir , ▁with ▁fo am ▁wing ▁rib s ▁all ▁covered ▁in ▁do ped ▁fabric ▁or ▁D ac ron . ▁The ▁wing ▁is ▁a ▁three - pie ce ▁design , ▁allowing ▁quick ▁dis assembly ▁for ▁transport ▁or ▁storage . ▁The ▁landing ▁g ear ▁susp ension ▁is ▁made ▁from ▁map le ▁wood . ▁The ▁Sky ▁P up ▁can ▁be ▁built ▁with ▁an ▁open ▁co ck pit ▁or ▁fully ▁en closed , ▁allowing ▁flying ▁in ▁cool er ▁weather . ▁The ▁Sky ▁P up