I can't say exactly with the Zinger, but the Top Flite 18x8 was tached at 8800, and I think the Zinger is turning a little slower. I have a Perry pump and use medium fuel tubing. My mixture setting is about 1-3/8 turns out, which leaves a good smoke trail and doesn't lean out in the air. Oh, that RPM number is ready-to-fly, not peak.