Did you try the AMA.   Of course Dan McEntee may have the mag his self.

Hi Ian. I have the May 53 issue and the only thing listed  is an "A" class speed model article called "World's Fastest "A" ". I held the AMA and FAI record for a while.  IF this is the article you want I will email it to you. Ty M.

Ty - many thanks. I saw your e-m to me and have replied.
From your above it seems I may have got the mag. wrong. The Flying Wing design appears on the Wilks U.S. Speed designs disc, in the "B" section.
I tend to like the oddball designs that no-one else bothers to build. I did intend to build one for a Dooling 29, but having just acquired a nice McCoy 29 will now build for this motor.