I was thinking I'd put a TS .56 that I have now from my crashed Cap into my NexStar so I could use the OS .46FXI in my new WM Ultimate. The .56 has great power & is not a whole lot bigger in physical size. I have an older OS .60 that is quite a bit larger in size than the .56 I think the only changes I'll need to do is re-check the CG. & it will allow me to swing a litter bigger prop too. It did real well on the Cap with a 12X6 on it, the .46 likes an 11X6. We'll see what happens. I too want to try the float fly thing. I originally thought I would put them on my Tower Trainer but that darn thing flies so nice just as it is I've decided to leave it alone & do any changing & experimenting with the NexStar instead.