Richard Glassock did his graduate work on small hybrid gas-electric systems, and keeps your editor current on that part of the aeronautical power spectrum. He recently shared one promising example of such technology in the drone market. Where current quadrotors are limited in size, power, and flight duration, the Quaternium Hybrix 20 is larger, heavier, and can fly for up to 2.5 hours, according to its makers. The, according to its Spanish maker Quaternium is six times the endurance of current camera-bearing drones. The 20 weighs 11.3 kilograms (25 pounds) empty and can carry a 7 kilogram (15.4 pounds) payload. It approaches the current limit on the Small Unmanned Aerial System (SUAS) of 25 kilograms (55 pounds) and does not exceed the 100 mph speed limit for such systems. The video, judging from the size of the vehicle relative to the human starter and pilot, is the 20. The 50 and 100 are proportional to their designation, based on the …