RE: Hitec HS-5475HB - Do they include metal servo arms?
Actually only the metal geared digital servos come with the aluminum horns. The digital Karbonite servos come with the new Heavy Duty black horn set. We know of several people that are using those servos in similar type aircraft with excellent success. However, if you plan to fly the plane 3D with mass throws I would opt for a metal geared servo instead.
I feel the 945's are a better choice. The 925's are too fast in my opinion for that application and will make the plane twitchy.
Mike.