The drone logistics sector has largely pursued faster, heavier aircraft capable of carrying large deliveries over long distances.

A French startup, Celeste Ecoflyers, is making the case for the opposite approach. The firm contends that slow-moving, lightweight drones offer superior safety, efficiency, and practicality for last-mile deliveries.

The Celeste team argues that large, heavy drones pose a serious cybersecurity risk, as they could be hijacked and used for harm by malicious hackers. Recently, they completed ground avionics testing of its dAS10 fixed-wing aircraft, which features an inflatable wing structure.

Slow and steady wins the race

In an industry often focused on speed and scale, the team at Celeste Ecoflyers proposes a shift toward deliberate moderation. A slow, light model offers minimal strategic value to attackers and limited destructive potential even if seized.

Beyond the cybersecurity advantage, the Celeste team argues that larger, lightweight drones can integrate more readily with manned aviation. Their size makes them more visible to pilots, reducing collision risks. Low mass, meanwhile, would limit any potential damage in a collision incident. The company describes its designs as “flying marshmallows” — noticeable yet benign.

Infrastructure requirements also favor the lightweight approach. High-speed, heavy drones demand large landing zones. Some even require dedicated facilities, leading to inflated costs. Lightweight models, however, can operate from rooftops, small warehouses, or almost any flat surface.

One of the clearest advantages comes in the form of energy efficiency. According to Celeste, reducing speed from 200 km/h to 25 km/h can cut energy consumption by a factor of 64 over a 100 km route. This makes extended flight times feasible, enabling overnight operations where total duration matters less than reliability and cost. Essentially, multiple slower deliveries can still outperform single high-speed runs in overall efficiency.

Celeste completes avionics testing

Celeste is working towards demonstrating these advantages in real flight tests. The company recently announced the successful ground activation of its dAS10 vehicle’s avionics system at Le Havre airport.

The dAS10 is an 8-meter inflatable fixed-wing aircraft. Celeste claims its pneumatic textile wing structure enables a 300km range and 6-hour battery endurance.

According to a report from Defense Blog, the recent test session included taxiing trials, ground control validation, and a brief hop flight. Ultimately, Celeste is happy with the outcome of the tests, and it believes it has cleared a key hurdle on the road to operational flights.

The dAS10 aircraft, which is registered in the French civil aviation register as F-DCCH, is qualified under France’s UAS regulatory framework.

Celeste Ecoflyers’ aircraft design emphasizes gliding capability for safe landings even in engine failure, combining low weight with operational robustness. The company sees slowness not as a limitation, but as a strategic asset that reduces risk, trims costs, and eases environmental impact.

As regulators and operators weigh options for scaling drone delivery, Celeste’s technology could provide a viable path that prioritizes sustainability and integration over raw performance. Whether the broader industry adopts this slower-is-better mindset remains to be seen. Either way, the company presents a compelling vision for a safer future where even compromised delivery drones could harmlessly bounce away from a collision point.