A jet engine that weighs just 44 pounds shouldn’t exist — yet here it is, powering a fully capable personal aircraft. This tiny turbine produces 240 lbs of thrust, enough to push a minijet past 300 km/h (186 mph). The entire airframe — carbon fiber, avionics, fuel system — weighs less than two adults. Efficiency and engineering are doing more than brute force ever could. And here’s the wild part: Full-size turbofan engines weigh 1,000–4,000 lbs Operating one can cost $2,000 per flight hour A min

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