Miguel,

I built the Viper a month ago but elected to paint it in different colors, by doing so it added some weight to it. Hence, I had to add a pound of weight to the nose for balance, even with all the batteries up front. The new Viper is beefed up with corbon fiber and resin in stress points adding to the overall weight.

Use the servos Tam suggested, he has been through it. By using different servos that are stronger, they are taller for some use. I had to make servo covers out of .010 BVM polly ply besause the ones supplied are set inside the cut out. Then I used clear silicon to attach them.

I powered mine with a P120 turbine, this is plenty of power, the model is a great flying plane. With the wing loaning keep the speed up and watch the nose attitude. On the second flight I dropped the gear and pulled the nose up before the flaps, to my surprise it did a half snap. I keep the speed up from now on and not had a problem.

Good luck,

Ken.....