Certainly, your comments comparing 60 size with giant scale are true. Im a big fan of lots of horsepower. There is of course, no substitute for power. When you build a plane from a kit, its easy to make modifications to accomodate extra power. With an ARF, its not too easy, but still possible/practicle to make some mods. I have this to say about GP's Pitts. There really isnt any reason to over-power it. That plane is SUPER lite, and performs fantantisticly with an OS BGX. Want more? How about a big MOKI? Larger gas motors will shake that model to pieces. I had a 1/3 scale Pitts that had a wingspan 2 inches less than GP's Pitts. It was scratch built from "Scratch-a plane" plans. It weighed in at a whopping 22 lbs, with a Sach's 4.2. A tad tricky landing, but barring that, the model flew great! Hmmmm, 22 lbs vs about 14, and the GP version is a tad bigger! My GP Pitts has unlimited verticle with a 20" x6-10 prop. If you chose a big gasser for this plane, look out below!! It appears to this meager reporter, a large glow powerplant is plenty for this plane.