Solar Impulse 2 crashes in Gulf of Mexico during unmanned test flight

<p class="p1"><span class="s1">The aircraft, acquired by Skydweller Aero in 2019 and converted into an autonomous long-endurance platform, crashed after a loss of power. It was equipped with approximately 17,000 photovoltaic cells on its wings.</span></p><p><strong>From <a href="https://www.pv-magazine-mexico.com/2026/05/12/se-estrella-en-el-golfo-de-mexico-el-avion-solar-impulse-2-durante-un-vuelo-de-prueba-no-tripulado/" rel="noopener" target="_blank">pv magazine Mexico</a></strong></p>
<p>The experimental solar-powered aircraft <a href="https://www.pv-magazine.com/2025/04/07/flying-with-the-sun/" rel="noopener" target="_blank"><span class="hover:entity-accent entity-underline inline cursor-pointer align-baseline"><span class="whitespace-normal">Solar Impulse 2</span></span></a> crashed on May 4 in the Gulf of Mexico off the coast of Mississippi during an unmanned test flight operated by <span class="hover:entity-accent entity-underline inline cursor-pointer align-baseline"><span class="whitespace-normal">Skydweller Aero</span></span>.</p>
<p>Preliminary information from the U.S. National Transportation Safety Board (NTSB) indicates the aircraft lost power shortly after takeoff from Stennis International Airport and went down in international waters near Bay St. Louis. There were no fatalities or injuries, as the flight was uncrewed.</p>
<p>Developed by Swiss aviation pioneers Bertrand Piccard and André Borschberg, <a href="https://www.pv-magazine.com/2016/08/30/interview-how-solar-impulses-round-the-world-flight-took-batteries-on-a-journey-of-discovery_100025941/" rel="noopener" target="_blank">Solar Impulse 2</a> was originally built as a demonstrator for solar-powered flight. Between 2015 and 2016, it completed the <a href="https://pv-magazine-usa.com/2016/06/23/solar-impulse-completes-historic-flight-across-the-atlantic/" rel="noopener" target="_blank">first circumnavigation of the globe</a> by a fixed-wing aircraft powered solely by solar energy, covering approximately 42,000 km over 17 legs.</p>
<p>The aircraft was sold in 2019 to Skydweller Aero, which converted it into an autonomous, long-endurance platform for surveillance, communications and testing applications across civilian and defense programs. It retained a wingspan comparable to that of a Boeing 747 and was equipped with around 17,000 photovoltaic cells integrated into its wings.</p>
<p>The investigation remains ongoing, and no final determination on the technical cause of the crash has been released. Preliminary reports point to a loss of power prior to impact, resulting in the destruction of the aircraft.</p>
<p>While the crash marks the end of the specific airframe that achieved a milestone in solar aviation, the Solar Impulse project remains a reference point for demonstrating the feasibility of long-distance, fossil-fuel-free flight.</p>