I ran one on a 12 oz foamy. That's it's absolute max for 3D flying. I was running 1200 3s lipos. Punchout was not awsome....but it was OK. As for putting it on a 5-6 oz plane....it won't be 5-6 oz anymore. This little thing is kinda heavy. For 5-6 oz...get a GBV1.1 kit for $8 from gobrushless.com. These things weigh like nothing compared to the axi and will 3D the hell out of a 5 oz airplane.