Check the forum as opjose has suggested. Other than that, it will build out at about 13 pounds with a OS160. You will probably have to add weight to the nose to get a decent balance. It has a very narrow landing speed, too fast & it floats into the next county, slow it down, and it tip stalls. Putting a little washout into your ailerons will help remedy this, but I would highly recommend flying it in. Landings were the only complaints that I had, and weak landing gear, which I have two right hand sets (none for the left). I would recommend a good set of 6061T X 3/16 in thick or better (2021 I think) aluminum or carbon fiber landing gear. Check your glue joints, particularly in the nose and landing gear area and put some reinforcement on the landing gear blocks where they join the formers and fuselage sides, perhaps with some fiberglass, or at least triangle stock.

My plane flew very well. I really liked the way it flew. It tracked very well, but I never could get the think to make good landings on a regular basis. You will probably have two different sets of CG instructions included with your model. As memory serves me, I balanced mine at about 132mm from the LE of the wing at the fuselage, and had to add a 2 oz spinner weight, and the throttle servo and RCVR battery forward of the firewall and about 1 oz of weight attached to the firewall before achieving that CG. You might want to keep yours a little more forward (something like 124 to 127 mm) of that CG until you get a feel of the plane. I have all of the info documented on the instruction booklet, but after a quick look-see, could not find it. I think you will find the suggested CG info available in the forum opjose has mentioned as well as others takes on the plane - lots of good info.

As I said, I like the plane except for the landings, and it was a bear, and I never really got a grip on landing this bird. Others apparently have not had the problems that I had with the landings, but I would definatly set up the ailerons with them set slightly up when at neutral. It is one of the prettiest Yak's out there, always getting comments from anyone that saw it.

In addition to two right-hand landing gear halves, I have a set of wings in good shape (they are built heavy, one has slight damage to a LE tip that has been repaired) if they are needed.

If you have other questions, let me or some of those that have experience with this bird know.

I've found that in this hobby and life as well that "fools learn from experience. Wise men learn from the experience of others!"