Large chunk of airframe -Ebay France

Thanks to all.

Not seen this style on a Ju88, there is an unfamiliar vibe about the style of construction such that I get a vibe it could be French airframe, on account of the construction being somewhat eccentric with some very fine rivet pitches and then pitch changes significantly along stringers also several unnecessarily different profile stringers and the lightening holes smack of final desperation to keep airframe weight down. It’s like this area of airframe has had various manf mods to make it stiffer and/or the design is not one of efficient rationalized mass production its complex for no good design reason in my eyes.  There are traces of light blue like Germans and French used. 

Also that piston is i think too small for aero engine.

The Tupelov SB had similar holes along the stringers as shown

Lightening holes ? or perhaps using the ‘Top Hat’ stringer section for area cooling or similar ??

I have never seen a stringer used for that purpose but I guess it could work for low pressure cooling air.

Hi all

Don’t recognise that as Stirling structure, the stringer profiles don’t match anything I’ve seen

John

Mark I was referring to the upper stringer in the inside view – that has a row of lightening holes along the length

Its not a lightening hole in a rib, not even an inspection hole/panel?

It looks far more like a fuel tank flange / valve mounting hole?