In various images of the Solar Impulse aircraft, I see the engines mounted in different positions along the wing. Am I looking at SI 1 vs SI 2, or are the mount positions capable of reconfiguration depending on conditions/experimentation?

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    $\begingroup$ Welcome to Aviation. Maybe you can provide URLs to two images showing the difference, that someone will convert in inline images. $\endgroup$
    – mins
    Commented Jul 10, 2015 at 19:39

1 Answer 1


Solar Impulse 1 had 2 engines right next to the fuselage, and the other 2 further out where the wing bends upwards.

Solar Impulse I

Solar Impulse 2 has a pair of closely spaced engines on each wing, located partway out onto the wing.

Solar Impulse II


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