Gandh brandi
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:O wow! but recovery must be a bitch process. Phoenix said they're retrieved via parachute.Looks like a solid fuel rocket pack assisted take off (JATO pack) with a small petrol engine in the nose that produces thrust. The props are spinning but cannot be seen. This is a small 25 to 30cc engine, typically used with weed trimmer applications, but converted for drone use in this case.
Once you use rocket assisted takeoff, you don't need a lot of engine power to stay aloft.