The He 111Z Zwilling was a WWII aircraft designed to tow gliders of the German Luftwaffe. The aircraft is essentially two He 111 airframes coupled together by a new central wing panel and fitted with a fifth engine.
https://s3-us-west-1.amazonaws.com/h..._zwilling1.jpg
https://s3-us-west-1.amazonaws.com/h..._zwilling2.jpg
https://s3-us-west-1.amazonaws.com/h...1_zwilling.jpg
https://s3-us-west-1.amazonaws.com/h..._zwilling3.jpg
Previously:
https://www.homemadetools.net/forum/...989#post125173
https://www.homemadetools.net/forum/...399#post122142
https://www.homemadetools.net/forum/...510#post127969
https://www.homemadetools.net/forum/...392#post127205