I use the Hitec HS425BB in all my 40 and 60 size planes, never had a problem, they are very durable servos. I bought a box of 20 and got a great deal, they are on E-Bay now in a box of 15 for $135, add in the shipping costs and it comes out to $10.20 apiece (if my math is right) if you want some spares for future projects.