I have a quick question for the experts on this list. Is there (or has there ever been) a helicopter powered by a rotary-piston engine? Best, Marc de Piolenc -- Archivale catalog: http://www.archivale.com/catalog Polymath weblog: http://www.archivale.com/weblog Translations (ProZ profile): http://www.proz.com/profile/639380 Translations (BeWords profile): http://www.bewords.com/Marc-dePiolenc Ducted fans: http://massflow.archivale.com/ -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html