RE: Servos for 1/4 scale...
Navy18
These pics show the rudder pull pull. These aren't wooden Cubs but the installation is straight forward. Cables are kevlar (Sullivan 30' kit) and the battery is Sanyo 2300 NiMH from Costco (I soldered the AA cells together myself). Rudder horn is a Sig HS716. The HS645M servo is definitely strong enough for the rudder because it'll knife edge all day long.