Tiny Single-Circuit Carburetor for military UAV. I recognized a dire need for a client, where designing an entirely new carburetor for their aircraft would result in huge reductions in fuel consumption. I studied their existing carburetor and concluded that the dual-circuit unit had to be tuned fuel-rich operation in order to run without stalling when the engine transitioned from the idle circuit to the main fuel circuit. I reasoned that a properly designed carburetor could result in vastly better performance, over TWICE the mission endurance!