My RV-4 system
Here are some shots of the system I put in my RV-4 during build. This is the standard VANs set-up. The dive motor/jackscrew is horizontal in the tunnel on the left side. There is a pivot lever that attaches to the drive motor and is fastened to the R/H side of the tunnel with a bolt that goes through the belly skin and an angle on the tunnel. The unique flap weldment arm is different than the manual flap weldment and has a horn that connects to the pivot arm via rod end linkage. I have a small R/C model wire link to a position indicator X-ducer for the Ray Allen indicator and control my flaps via pushbuttons on the stick. I really like the set-up, and have sidewall panels that cover all the flap actuation arms, so there is zero chance of PAX fouling anything and better footwell room as well. I have seen some sidewall mounted actuators that have been adapted to the standard flap weldments that work equally as well, however this system was easy to install during build.