There are quite a few airplanes that will work well on an OS 46 FX. One thing you can do is get a macs pipe for your engine. I have not noticed any real power increase but it does smooth out the mid range.

Here are a few

1. [link=http://swanyshouse.com/burrito/burrito.html]Burrito[/link]

2. [link=http://swanyshouse.com/mojo/mojo.html]MOJO[/link]

3. [link=http://ohiomodelplanes.com/47edge/]OMP Edge[/link]

4 [link=http://ohiomodelplanes.com/47yak/]OMP Yak[/link]

5 [link=http://spadtothebone.com/freeplans.htm]SPA3DT[/link]

That is what comes to mind right now. There are plenty more.