Parrot Swing has an "x"-wing and I wonder how it compares to the normal wing.
Refer to it's picture:
http://www.popsci.com/sites/popsci.com/files/styles/large_1x_/public/images/2016/08/parrotswing.jpg?itok=qr-G3KRm&fc=50,50
good in theory but difficult to build so not so good in practice
The span efficiency factor of an X-wing is 1.33 (source: E. Torenbeek: Advanced Aircraft Design, Fig. 6.1). So the lift dependent drag is relatively good, but you have a large wetted area and friction drag.
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