Ron,

Here is what I came up with.

My plane weighs in at 10 # on the nose.

I have a small piece of automotive wheel weight screwed to the fire wall. ( perhaps 2 ozs,)

I have an aluminum Higly nut in front of the prop.

My receiver & battery are jammed as far forward as possible.

My cg is 4 1/2 inches from the leading edge.

I am using a Saito 90 4 stroke for power.

It is not the fastest bird I have ever flown, but it is a warbird and it flies realistically and as if it were on rails. It will do a lot of manuevers that warbirds were not intended to do.

With that said, the plans book says that it should come in at 7 1/2 to 9 #.

You said that yours weighs in at 12 1/2#. [][][]

This is were I am no expert.

I think by glassing that bird you may have made it too heavy for a 90 2 cycle, I don't know.

But if your plane is balanced properly and with adequate power it should fly well.

Good luck, if I can be of further help, let me know.

Bill