Czech sub-250g drone hits 351.4 mph to smash speed record

A sub-250-gram drone built in the Czech Republic pushed the FPV speed ceiling to 351.4 mph on a two-way pass, and the number only tells part of the story. Born4Flight’s SH250G SpeedHunter, flown by founder Jakub Ešpandr, also reached a peak of 406.8 mph during the attempt, a reminder that in this class every gram, watt, and bit of drag control matters.

The run took place at Kámen Airport on May 28 and was measured over a 100-meter window as a two-way ground-speed average, the same basic format used to blunt wind influence. DroneXL said the result was Guinness-aligned but not Guinness-certified, which matters in a discipline where the difference between a headline and a record depends on how the attempt is measured and who signs off on it.

The hardware package was built as a single engineering stack. Born4Flight paired the frame with its B4F CREST flight controller, B4F SURGE modular ESCs, B4F:FL1GHT firmware and A3ROFLOW simulation lab, then fed it with a 2,500-watt electric drivetrain. The propeller was custom, labeled 2.72xB4F mk28rev22PROgen8v7, and Born4Flight said it took 28 revisions before the record flight. That is the kind of iteration that can influence race tuning in a meaningful way, especially in prop efficiency, motor output and airframe rigidity.

Not every lesson from the SH250G transfers cleanly to racing. The build was tuned for a straight-line blast inside a tightly controlled 100-meter window, so its battery strategy and power delivery were optimized for a violent burst rather than the sustained throttle management racers need in a multi-gate course. Still, the underlying idea travels: reduce drag, hold the airframe stable, and match prop, motor and electronics so the craft stays efficient when pushed hard.

Born4Flight says the SH250g SpeedHunter is the world’s fastest minidrone under 250 g at 565.4 km/h, and the Czech record-keeping group Agentura Dobrý den lists Jakub Ešpandr of Pardubice and Born4Flight s.r.o. with the same figure. The result sits inside a broader speed arms race that now includes Guinness’s 358.36 km/h micro-drone benchmark from Tianjin, the Drone Racing League’s 163.5 mph quadcopter mark from 2017 and the rapid escalation of battery-powered drone records since. For FPV builders, the message is clear: the ceiling is still moving, and the sharpest gains are coming from engineering discipline, not just raw throttle.