Thats funny how you say that when every satio engine up to the 100 weighs less than any 60 sized two stroke with a muffler. I dont know about how that plane 3-D's but if you can get it to weigh 5 pounds or less then your 46 two stroke will be enough. If you are goind to trade your engine in, I would get anything between a Saito 72 up to the 100. The 72 weighs 3 oz less than the OS 70 and swings the same prop 300 rpm faster. The 100 weighs the same as the OS 70 and swings a 2" larger prop the same RPM. Of course this is just me and the only two strokes I buy are 80cc and up and burn gasoline.