Luke Bell/YouTube
Most drone engineers specialize in one goal: either speed or endurance. But Luke Bell and Mike Bell, the South African father-and-son duo known for pushing electric quadcopters to extreme speeds, seem determined to master both.
Recently, Luke quietly set an unofficial world record for multirotor hover endurance, keeping a drone airborne for 3 hours, 31 minutes, and 6 seconds—surpassing the previous 3-hour, 12-minute mark held by SiFly Q12. Even more impressive was the leftover power: at 2 hours and 14 minutes, he still had 33% battery remaining.
Why the endurance record is still unofficial
The record remains unofficial because Luke hadn’t previously tested the drone for anywhere near that duration. Not wanting viewers to sit through a four-hour attempt that might fail, he chose not to plan it as a formal record run.
The drone’s design follows one uncompromising rule: cut energy use at every possible point.
It begins with the propellers. Luke Bell selected 40-inch (101 cm) carbon-fiber G40 blades from T-Motor. Larger props produce the same lift at much lower RPM, dramatically reducing power consumption. As he explained, the bigger the propeller, the more thrust it can create while spinning slowly. The motor—a T-Motor MN105 V2 Anti-Gravity rated at 90 KV—was chosen as the lightest, smallest option capable of driving those oversized blades effectively.
Fine-tuning airflow, wiring, and weight for peak efficiency
The 800 mm arm length was set after five CFD simulations in AirShaper to reduce prop interference. The 11 meters of wiring were also optimized, with AWG 18 offering the best balance of resistance and weight. The central hub was redesigned twice, trimming 40 grams across the four-motor setup.
Luke Bell/YouTube
The critical component was the battery. Luke Bell used Tattu semi-solid NMC cells at 320 Wh/kg—double a typical LiPo. The gel electrolyte boosts energy density safely, and low peak discharge isn’t a problem for slow-spinning motors. Removing part of the casing cut 360 g total, nearly the weight of the carbon-fiber frame.
While hovering, the drone consumed about 400 watts. Gentle forward flight reduced that to roughly 250 watts—a 37.5% drop—highlighting where further gains might lie.
The hard limits of battery-powered flight
Mike Bell notes that aviation kerosene has 50 times more energy than current batteries. Even doubling or tripling battery density barely extends flight time, making long-range electric aviation unlikely; future carbon-free flight will need entirely new solutions.
Luke Bell/YouTube
On speed, competition is heating up. Australian engineer Benjamin Biggs hit an unofficial 411 mph, edging past the Bells’ 408 mph record from January 2026. Speeds have jumped quickly from 300 mph in May 2024 to 389 mph in December, with the Peregreen V5 already in development.
For now, Mike Bell says the team is concentrating on other ambitious projects but plans to return to speed trials with the V5, targeting 450–465 mph. Beyond that, further gains may come with future V6 and V7 versions. At present, he notes, propeller technology is the primary bottleneck; once that improves, battery power will become the next limiting factor.
Read the original article on:Newatlas
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