That's very helpful thanks
..I had an idea it might be like that as vectoring a contra rotating Griffin and Prop as well would be a bit too much of a challenge.
For the model I consider using foam core wings with tubular spars plugging onto...or into matched tube mounts on the engine pod/bridge center section. A servo acting on a second trailing spar..possibly on a worm drive to crank it up and down
??...........I shall refer back to my plan.
That's an awesome amount of Flap showing in that last photo.
Seagull 381 stats...according to my book ........not a primary source.
The Span is 16M /52'6"
Speed was 260mph Range 1230 miles
Variable wing incidence between 2.5&12 degrees.