Hi all
I have a new plane just finished biulding. Its a 40 trainner with a 4ch and OS .46 fx.
In checking the CG I found the plane to be a little nose heavy, I moved all the electronics and battery as far back as possible. Its still a little nose heavy. Will this be ok to fly or should I add weight to the tail.
Thanks.

You always want teh plane more nose heavy than tail heavy, at least, for teh first few flight (while you learn.)

A nose heavy plane is more stable, and predictable, and a tail heavy planes is, well, less stable. Hence why some pilots can do some outragieous manouvers, their plane is slight tail heavy.

Since you've buildt a trainer, and (assuming you're relatively new at this) want it slightly nose heavy. When properly balanced, the plane's nose should drop slightly.

Don't forget to balance it latteraly, that is, to see which wing tip is heavier. usually a string attached to teh propnut, and to a centeral point on teh tail. Suspend, and one wingtip will drop downwards. Add a small nail (or two ) to the lighter wing tip to balance it out..

Yes I'm new to r/c. By nose heavy I mean the plane noses down about 20-30 deg. I suspect I'll need to add weight to the tail.
Thanks for the info.

A 20-30 deg nose heavy for a .46 size trainer is not the end of the world. If it were that much tail heavy you would be in deep trouble. Do everything you can to keep from adding weight. Have your instructor evaluate the way the aircraft is set up before you do anything drastic.