Yep, you read it right, a Triumph helicopter! I saved this info because it was so-unusual. Would you want to fly using a pre-unit construction Triumph engine? I'll pass!
Yeah, think the "difficult to handle" description was a bit of an understatement, more'n likely the pilot got so dizzy from spinning around that he fell out....and that was it for the maiden flight.
That pre-unit Trumpet motor would be pretty cool to work on tho! unk: