▁of ▁, ▁giving ▁a ▁useful ▁load ▁of ▁. ▁With ▁full ▁fuel ▁of ▁ ▁the ▁payload ▁is ▁. ▁ ▁The ▁manufact urer ▁estimated ▁the ▁construction ▁time ▁from ▁the ▁supplied ▁k it ▁as ▁ 6 0   h ours . ▁ ▁Oper ational ▁history ▁By ▁June ▁ 2 0 1 4 ▁three ▁examples ▁had ▁been ▁registered ▁in ▁the ▁United ▁States ▁with ▁the ▁Federal ▁A viation ▁Administration , ▁although ▁a ▁total ▁of ▁six ▁had ▁been ▁registered ▁at ▁one ▁time . ▁ ▁Spec ifications ▁( U l tras port ▁ 3 3 1 ) ▁ ▁See ▁also ▁List ▁of ▁rot or craft ▁ ▁References ▁ ▁External ▁links ▁Ph oto ▁of ▁an ▁American ▁Sport sc opter ▁Ul tras port ▁ 3 3 1 ▁ ▁Ul tras port ▁ 3 3 1 ▁Category : 2 0 0 0 s ▁United ▁States ▁sport ▁aircraft ▁Category : 2 0 0 0 s ▁United ▁States ▁hel ic op ters ▁Category : Home built ▁aircraft ▁Category : Single - eng ined ▁p ist on ▁hel ic op ters <0x0A> </s> ▁John ▁Russell ▁Nap ier ▁( 5 ▁January ▁ 1 8 5 9 ▁– ▁ 1 2 ▁March ▁ 1 9 3 9 ) ▁was ▁an ▁English ▁cl erg yman ▁and ▁a ▁cr ick eter ▁who ▁played ▁first - class ▁cr icket ▁for ▁Cambridge ▁University ▁in ▁ 1 8 8 1 ▁and ▁for ▁Lanc ash ire ▁in ▁ 1 8 8 8 . ▁He ▁was ▁born ▁at ▁Pr eston , ▁Lanc ash ire ▁and ▁died ▁at ▁B ex hill , ▁East ▁Sus sex .