- Custom drone achieved a 261-minute flight after months of engineering refinements
- Guinness World Records recognizes Cape Town pilot for record-breaking multirotor endurance flight
- Software tuning unlocked crucial efficiency gains during the historic flight
A Cape Town YouTuber and drone pilot has secured a new Guinness World Record after keeping a custom-built multirotor drone airborne for 4 hours, 21 minutes, and 39 seconds.
The achievement followed months of redesigns, repeated testing, and engineering refinements that transformed an earlier prototype into an officially recognised endurance aircraft.
Rather than relying on a single breakthrough, the record came through a series of hardware and software improvements that steadily extended flight time beyond previous attempts.
Weight reduction and stronger construction unlocked longer endurance
Luke Bell had already exceeded the previous endurance benchmark with an earlier version that remained airborne for 3 hours, 31 minutes, and 6 seconds, although that attempt was never officially recognised.
Instead of submitting that result, Bell continued refining the aircraft with the goal of securing a larger margin and earning formal recognition from Guinness World Records.
One of the simplest improvements came after viewers suggested replacing two-piece clamp mounts with single-piece C-style clamps, reducing overall weight by approximately 26 grams.
Bell also rebuilt the airframe using continuous 1.88 metre carbon fibre tubes for each rotor arm, removing weak connection points that affected the earlier design.
Additional reinforcement connected the front rotor arms, while a custom mounting system secured the approximately 5 kg high-density SMC battery pack rated at 380 Wh/kg throughout the extended flight.
The drone also received specially designed 3D-printed landing gear incorporating thermoplastic polyurethane joints to absorb landing forces more effectively.
Live software tuning helped extend the record flight
Mechanical improvements alone did not deliver the final result because early test flights revealed vibration 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 centimetre.
Further adjustments focused on the autopilot, where notch filter tuning removed resonant frequencies responsible for instability while reducing unnecessary power consumption during flight.
Bell also monitored live performance through a Wi Fi connection linked to a RadioMaster transmitter, allowing power logs and flight settings to be reviewed while the aircraft remained airborne.
The data showed the drone consumed about 500 W during straight flight, compared with roughly 450 W while turning, prompting a mid-flight route change with more frequent turns.
Flying at approximately 5.5 metres per second, or around 20 km/h, the drone eventually returned after 4 hours, 21 minutes, and 39 seconds before hovering until almost every remaining watt had been consumed.
This feat shows that larger batteries alone may not determine endurance, as careful engineering, software refinement, and efficiency improvements also played important roles.
Via Luke Maximo Bell (YouTube)
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