there was a missunderstanding.
I had built three of the Ben Buckle D VIII.Only the last one will fly good.
I had built it all in the same way.
No wing sheet, with ailerons and all the same struts.( NOT SCALE ).
The first one, I sheet the fuselage and powered by a old OS FS 40 4-stroke [X(]. TOO MUCH WEIGHT.
The second one with an very old ( one of the first ) OS FS 60 with open valves.
Flies, but not very good.
The third one with an OS 48 FS Surpass, flies very good - scalelike.