JC Wings 1:400 Boeing 727-100 N32720 UFD United Flying Design Diecast Model1: 400 Diecast: Boeing 727 100 UDF N32720 (JC Wings). At first glance, this looks like a standard 727until you notice that right side engine. It's not a sleek turbofan like the others; it's something that looks like it belongs on a 1950s prop liner, with eight exposed blades sticking straight out. This is the GE36 Unducted Fan (UDF) testbed, one of the strangest and most fascinating aircraft ever to fly. So what's with that weird engine? In the mid