- Custom drone completed 261-minute flight after months of technical refinement
- Guinness World Records honors Cape Town pilot for record-breaking multirotor endurance flight
- Software tuning enabled crucial efficiency gains during historic flight
A Cape Town YouTuber and drone pilot has set a new Guinness World Record after keeping a custom multi-rotor drone in flight for 4 hours, 21 minutes and 39 seconds.
The feat follows months of redesign, repeated testing and technical improvements that transformed an earlier prototype into an officially recognized endurance aircraft.
Rather than relying on a single breakthrough, the record was the result of a series of hardware and software improvements that gradually extended flight time beyond previous attempts.
Weight reduction and stronger construction allows for longer endurance
Luke Bell had already surpassed the previous endurance benchmark with an earlier version that remained airborne for 3 hours, 31 minutes and 6 seconds, although this attempt was never officially recognized.
Instead of submitting this result, Bell continued to refine the aircraft in an attempt to achieve a greater margin and gain official recognition from Guinness World Records.
One of the simplest improvements came after viewers suggested replacing the two-piece clamp brackets with one-piece C-style clamps, reducing the overall weight by about 26 grams.
Bell also rebuilt the airframe using 1.88 meter continuous carbon fiber tubes for each rotor arm, removing the weak connection points that plagued the previous design.
Additional bracing connected the front rotor arms, while a custom mounting system secured the approximately 5 kg high-density SMC battery rated at 380 Wh/kg throughout the extended flight.
The drone also received a specially designed 3D printed landing gear incorporating thermoplastic polyurethane seals to absorb landing forces more effectively.
Live software tuning helped extend record flight
Mechanical improvements alone did not yield the final result as early test flights revealed vibrations severe enough to interfere with the flight controller’s inertial measurement units.
Bell replaced the original controller with a Cube Orange Plus system featuring isolated internal IMUs before installing an external antenna connected to a Here4 base unit for real-time kinematic positioning accurate to within 1 centimeter.
Further adjustments focused on the autopilot, where adjusting the notch filter removed the resonant frequencies responsible for instability while reducing unnecessary power consumption during flight.
Bell also monitored live performance via a Wi-Fi connection linked to a RadioMaster transmitter, allowing power logs and flight parameters to be viewed while the aircraft remained airborne.
The data showed that the drone consumed around 500 W in straight flight, compared to around 450 W when turning, which resulted in a route change mid-flight with more frequent turns.
Flying at around 5.5 meters per second, or around 20 km/h, the drone finally returned after 4 hours, 21 minutes and 39 seconds before hovering until almost all the remaining watts had been used up.
This feat shows that larger batteries alone cannot determine endurance, as careful engineering, software refinement, and efficiency improvements also played an important role.
By Luke Maximo Bell (YouTube)
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