In a stunning display of garage engineering and persistence, South African YouTuber Luke Maximo Bell and his father Mike have reclaimed the Guinness World Record for the fastest battery-powered remote-controlled quadcopter. On December 11, 2025, in Cape Town, their fully 3D-printed Peregreen V4 achieved an official average ground speed of 657.59 km/h (408.60 mph), verified through two high-speed runs in opposite directions to neutralize wind effects. The drone hit a downwind peak near 659 km/h and an impressive upwind 599 km/h (372 mph)—a solid 14 km/h gain over their previous Peregreen V3's upwind performance.The record, briefly held by Australian engineer Benjamin Biggs' Blackbird drone at 626 km/h just a month earlier, marks the Bells' third (or fourth, depending on counting) time atop the leaderboard in this fiercely competitive niche. What began over two years ago as iterative tinkering has evolved into a masterclass in extreme DIY aerodynamics and propulsion.Central to the V4's success is its single-piece frame, printed on a Bambu Lab H2D dual-extruder printer using a mix of PETG, carbon-fiber-reinforced PA6-CF, and flexible TPU. This larger build volume allowed seamless integration—no joints or seams to disrupt airflow—yielding smoother contours and superior surface finish after sanding and polishing the carbon composite.Aerodynamic gains came from extensive Computational Fluid Dynamics (CFD) simulations on the user-friendly AirShaper platform. Iterations refined the body shape for minimal drag, reduced flow separation, and optimized pressure distribution around motors and props. Hardware upgrades included 900 kV T-Motor 3120 brushless motors (up from 800 kV) for higher RPMs, and propellers trimmed to ~6 inches for better high-speed efficiency. Beyond raw speed, the project emphasizes reliability: bench-tested components, strain-gauge thrust measurements, and repeated real-world validation. As Luke notes in his YouTube video "THE RETURN – World’s FASTEST Drone V4," the focus shifted from peak power to repeatable, drag-minimized performance.This achievement showcases how accessible tools—desktop 3D printing, cloud CFD, and open-source iteration—enable hobbyists to challenge aerospace boundaries. With rivals circling, the record may not stand long, but Peregreen V4 proves innovation thrives in unexpected places.
