The Park Flyer Bird Dog with dihedral wing , intended for 3 channel flying has a very relaxed flight profile. Kit B-339W provides all the necessary parts to build a second wing for your Bird Dog with ailerons and functional Flaps. Kit is complete with everything in the box (including Y-harnesses for flaps and ailerons, and 12″ servo extensions for ailerons). Builder does need to supply and servos. The plan and instructions in your Park Flyer kit address both the Dihedral wing and this Sport Scale version Bird Dog.