OSP51 is a foamie rc plane made from a single sheet of Model Plane Foam. It is modeled after a D model Mustang from WWll, the " Detroit Miss". While the build was fairly uneventful, the tuning and trimming was a painful exercise in frustration for quite a while. However, after a good number of crashes, rebuilds and more crashes, She now flys about the way I want her to. Still needs some power on to avoid tip stalling, but much more tolerant that when first built.