By Isabel Goyer The world’s most successful maker of kitplanes, Van’s Aircraft, has announced its latest model, the RV-15. And, no, it’s not flying inverted. It’s a high-wing model. Van’s is calling it an engineering prototype, but it looks plenty polished to us. The video is, we won’t lie, way cool. The plane looks correct in every way, and just as importantly, it sounds amazing. Just what’s under the cowling making all that sweet music is a mystery. In its release, Van’s had a blast, revealing only as much as they wanted to and in a really fun way. From the company: Model: RV-15Engine: YesTo…