i used a magnum .52 four stroke and did not need any extra weight. Balanced at 3.75. Battery and receiver in the same locations as Helleja.

Also, all the push rods fit perfectly. I felt that it was a very easy plane to assemble although the instructions were not very accurate. Some steps were already completed (fine with me - the wing blind nuts and engine mount blind nuts were already installed) and a few pictures were back-wards. Did anyone else notice this?

You are going to love this plane. I like it more than the Magic 3D.