Skytrain, Noyade
Can't make the "emperor" clues fit - never was great on crosswords either but what about.....
Wackett Codock ( built to order of Charles Kingsford Smith) or Tugan Gannet derivative ?
I had my misgivings, too. When I saw the challenge prepared by David, I wrote to him we must have had this before (not according Mel's list, though).
Then I found David's challenge from September:
http://www.pprune.org/aviation-histo...ml#post5924795
No wonder...
Reg