Ken,
I don't remember the O-1 having fowlers. I remember them having an offset hinge also, very similar to the PA-18. They had some rediculous degree of deflection, it seemed like 80*, but was probably 50 or 60. The cub should drop in quite nicely with them, I also plan to have the ailerons drop 10 or 15*, or maybe go up for a crow configuration. Not very scale but it should be interesting. There is a Super Cub mod that drops the ailerons with flap application, so that will be scale. The full deflection of my flaps will be 45-50*, 1-1/2" or so of deflecton at the trailing edge. I checked out the Robart fowler hinge, it is very similar to the high wing cessna flap hinge. It is a bit large and heavy for this plane, as well as costing as much as the entire kit. I used autocad this time to do all of the drawing for several reasons, one of them was so I could make precision templates to drill the holes for the hinge points. I will have to take some pics of them when I get home, they proved to be very helpful. They set the holes straight in the right place at the right angle. I know that using jigs and drilling guides isn't new, but I havn't really used them before. They are really easy to make and are almost critical to this mecanism's operation. Here are a few more pics of the flap hinged with the linkage installed. It isn't quite at full extension in the pics, there is still a little trimming to be done around the linkage. The servo will just be glued in with D7000 with a hatch for access.