quote:
PS - search under Bu-131 BÜCKER JÜNGMANN (inline) or Bu-133 BÜCKER JÜNGMEISTER (radial) for your other biplane.
I'm not sure that your post is clear about the BÜCKER designation. The designation and names have nothing to do with the engine, but rather one seat or two.
The 131 is a tandem two-seater. In the images I attached that isn't obvious, but the slim nose of it's in-line engine is in contrast to the Bu-133's radial. You can't label the images here, so . . .