The Yak Jr. is definetly a good plane. I wouldn't use an HS-55 on the ailerons though. Get a Dymond D47 for the ailerons. It only weighs 4.7 grams and has 20 ounces of torque. That's about 30% more torque than an HS-55 and about 40% less weight. I used Bluebird 4.1 gram servos on the tail. Mine flew great and was pretty durable considering how many times I banged it into the ground. The 38" version is probably next for me.