AD500 飞艇.pdfVIP

540 FLIGHT International, 24 February 1979 A D 50 0 AIRSHIP ally be able to carry farepaying passenger s anywhere in th e world . Certification called for a lot of extr a work an d time , not least because to begin with ther e wer e no firm British Civil Airworthines s Requirement s (BCARs) . Roger Munk, chief design engineer of th e AD-500, speak s highly of th e CAA, which wa s faced with th e task of writing th e rulebook . He says tha t th e Authority wa s helpful an d always willing to see th e company s point of view, pro- ducing a new part of BCAR for airships , Section Q, within about six months . Envelope THE envelope of th e new airship is mad e from thin single-ply polyester coated with titanium dioxide polyure- thane . Th e fabric wa s developed by Aerospace Develop- ment s in conjunction with two French companies : Brochier, which mad e th e material , and Aerazur , which assembled th e envelope . Th e materia l is stronger across its width , or weft, than along it s length . This is desirable for two reasons . First , th e best way to form an envelope is to fix together shaped strips , called gores , runnin g lengthwise. Second,