Check the listing for details. E-flite UMX Ultrix BNF Basic EFLU6450 Airplanes B&F Electric. Color: White, Condition: New. Listed at 99.99 USD. Introduction The Ultrix™ features a unique, all-new design that delivers a flight experience unlike any other, especially for models in the UMX™ (Ultra Micro eXtreme) class. This twin brushless motor-powered, delta wing airplane excels at smooth sport flying, basic aerobatics and even aggressive 3D — all in the same flight. Its incredible power-to-weight ratio provides hovering capability and unlimited vertical performance. Differential thrust adds yaw control and the ability to perform advanced aerobatic maneuvers including harriers, amazing flat spins and more. Plus EPP construction makes the Ultrix the most durable UMX model yet — ready to thrill RC pilots with more performance in more places and smaller spaces! Features Innovative and unique design capable of smooth.