Today was a full day working on the Bearhawk with a fair amount of time spent head scratching. I probably actually put iin over 11 hours in all but I logged only my estimate of actually building time.
I still hadn't drilled and clecoed my short ribs behind the false spar at the fuel tank -so I did that. The hole for the torque tube needed a little filing here too. They aren't primed yet either.
I wanted to drill the holes for the flap arms to the toque tube. After studying the plans closely it looks like the flap lever and flap arms on the opposite ends of the torque tube are about 25 degrees different in relation to each other. The plans show the flap lever at the wing root at 30 degrees and the flap arms at the pushrod at 55 degrees.
I couldn't tell for sure if the push rod that connects to the arm is supposed to sit on the rubber bumper or hover over it with the flaps in the up position so I asked the Bearhawk eGroup. Eric Newton confirmed that the push rod does sit on it.
I put a rubber bumper on the left wing support frame and used the springs to hold the flap arm assemble resting against it. I drew a center line on the flap lever at the wing root and used an angle finder to position it to 30 degrees. This is the position that I drilled and bolted the flap arms to.
I decided I better ask the group if this is correct. Another question I had was where does the flap lever line up span wise at the wing root that the cable attaches to (how long is the torque tube?). I did a lot of studying of pictures on Erbmans CD and it seems to me that lining up with the rear spar attach hole makes the most sense. It would be the area of least interference.
I did ask the questions of the group but I didn't get a reply. It was a heavy "OT" day so I guess it got buried in the pile. I was so confident that this is correct that I went ahead and did both wings this way.
To finish out the day I rechecked the left wing for level and square and drilled and clecoed the center ribs to the main spar.
