There are many LAs that power trainers at my field and most of them run fine, but compared to my TT GP 42, both the OS 40 and 46 LAs seem to make significantly less power. One guy has a 46 on his Superstar 40 and it struggles to get the plane airborne off our clubs grass field. My Avistar leaps into the sky in about a quarter of the distance... If you're looking for a cheap ($50) brushing engine, take a look at the TT.