Burnelli UB-38

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As Lockheed, with its P-38 design, failed to reach the long-range specifications, the Burnelli company modified it with much more room for fuel: UB-38.
Trans-Pacific ability!

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I think I will have to modify the leading edge, with the help of http://www.jitterbuzz.com/manreal/burnelli_01.jpg

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Improved version (able to fly!):

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The UB-38 (then improved UB-38A) was the "real" part, but Ing. Burnelli then said this plane coulda/woulda/shoulda have radial engines like his UB-14B: this led to the UB-38B...

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My son Jacky disapproved this design UB-38B and required the tail to be removed, and the colour to be changed (shoulda!): UB-38J

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Engineer Jacky, 4 years old, required less realistic colours, and I added a canard tailplane for balance...

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As the foreplane denied the "flying wing" name on the UB-38K, we coulda/woulda/shoulda add fins for better control: UB-38L

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Cooperation with my little son goes on, do you adults have other improvement ideas?

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To take off with trans-Pacific fuel, 3 engines might have been necessary:

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With a very long runway and reduced drag, one engine might have been enough at last...

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With a bigger engine and even reduced drag, this gave the UB-38MD (Minimum Drag):

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A derivative of the former, more balanced when the tanks are empty: UB-38ME

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UB-38MF: reduced drag did not mean two engines were forbidden (to have a free nose)

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With a bigger engine and even reduced drag, this gave the UB-38MD (Minimum Drag):

Wrong! A Lightning cannot be single engined! A Zwilling may cure the problem, even in the flying wing family:

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Increased range on this version: