OK I didn't buy the sk50 because its cheap .I did a lot of research and read a lot of forums and owner reviews .From this i determined that the os is good engine that has to rev to 16,000 to reach its peak hp.Thus turning a smaller prop.
the SK reaches peak hp at 12,500 and has torque than the 46 ax.This means the SK can turn a bigger prop and still be in its power band. The SK also had as good of results as the OS did. Approximately 82% positive for both