Check the listing for details. E-flite Ultrix 600mm BNF Basic EFL02250. Color: White, Condition: New. Listed at 179.99 USD. BIGGER FLIES EVEN BETTER! Soon after it was introduced, the UMX™ Ultrix™ became one of our most popular ultra-micro models. There was, and still is, nothing else like it! The unique delta wing design excels at smooth sport flying, basic aerobatics, and even aggressive 3D — all in the same flight. This scaled-up version offers the same unique capabilities AND the advantages of a larger size. It's easier to fly because it's easier to see and handles more wind. The Ultrix 600mm also uses more common 3S 800–850+ mAh batteries and includes an optional-use fixed nose wheel so it can takeoff from and land on smooth surfaces. Like the original, it has an incredible power-to-weight ratio for hovering capability and unlimited vertical performance. Differential.