Pylon racers use the Hitec 225. Go with the metal gear version for extra durability. Also remember this is a copy of a plane designed around a lot more weight than we are building into this.
The HS-225MG is a fine choice but the stock servo bays need to be slightly enlarged. They also weigh 1.09 oz. each as compared to .67 oz. for the HS-85BB and are a bit more expensive. The torque rating is slightly higher for the HS-225 at 54 oz. compared to the HS-85 at 42 oz. I would think two HS-85BB with a combined torque of 84 oz. is more than adequate for this application. It's quite possible that a single HS-225 on elevator may suffice but it's not my first choice. I'm not a real big fan of metal gears in these smaller servos as the small pinion gear is still nylon and is usually the first thing to strip anyway. The metal gear version of either of these servos will also develop slop much faster than the nylon version. True this platform was originally designed for a lot more weight but that is with a turbine strapped to it. This plane is also quite a bit smaller than the design it was copied from. I usually try to keep any plane as light as possible without skimping on quality or going to extremes to lighten it. There is no doubt this plane will fly very nicely with a multitude of combinations, it's all about what makes each pilot feel the most comfortable.
