Span 102 cm, for light 6,5 ccm ( 40 ) engines. This was my first biplane. The main goal for this design was simple construction, with flight performance and looks as secondary importance. That’s why a profile fuselage was chosen.    
Two wings are a little more work than one. However by careful thought out construction the effort can be kept within acceptable limits.  
The two wings don’t have the same planform, but they have exactly the same ribs. Flaps are on the bottom wing only. They can be fixed as well, or both wings can be equipped with flaps. With a system of “half ribs” the top wing can be easily and accurately rigged up correctly ( this method is further explained in detail on the biplane page ).
The original came out at 1120 gramm ( 39 oz.) and was flown with an OS 35S engine. A 40 engine should be a better choice. The airplane can do all manoeuvres, but flies corners rather soft and doesn’t like the hourglass very much.
    The name? Oh - In German a Doppelstecker is an electrical double plug connector. The verb “stecken” means to stick or plug, and it’s also common modellers slang for crash ( you can read it as “doublecrasher” ). And Doppelstecker sounds pretty much like Doppeldecker - hence this name seemed appropriate.