The Zivko Edge 540 in .90-class size from Seagull Models — the Red Bull Air Race champion in mid-class ARF form.
The Zivko Edge 540 first flew in 1996. This RC implementation is from Seagull Models, a Vietnamese-owned RC manufacturer. The '.90' refers to the .90-cubic-inch (about 15cc) glow engine class. A natural sibling of the Edge 540 Seagull 1.20 (Ultimate 3D 2) and broader Edge 540 family.
A demanding aerobatic mount in the mid-class ARF range.