Demonstration of the beveling of the stabs. Also, to illustrate the fashion in which the rudder and stabs will be hinged.
Mark the position of the hinges on the LE and TE of the hinge. there are two at tips and root, that are 1" apart. The remaining will be 3 inches apart. total of 7 hinge points for each elevator.
these are Robart 322 hinge points, which means, they are unassembled hinge points. They are 3/16" diameter hinge points, which are the largest they sell.
on the LE and TE, using a ruler, I use two points, one near root and other near the tip, that the center width is marked. then Using a ruler, the hinge line is drawn with a fine tip sharpie. Then, using the Robart Hinge Point Jig, the holes are drilled out.
Image of the jig in position, prior to drilling. This jig comes with two different diameter drill guides. I will use the small one first, then I will use the larger one last. More work, but helps to assure (for me), that the 1st hole is drilled at the cross mark.
the stab and elevator, are now put together with the hinges in, to assure that they are both inline, meaning, not off center.
to demonstrate the gap between counterbalance and the tip of the stab. This is 4 mm. Will be less once covered.
now, time to bevel. I am removing more off the elevator, and slightly less off the stab. Additionally, you remove more closer to the root, and less closer to the tip.
Meaning, measuring from the hinge gap up, 3/8" at the root and 1/4" at the tip.
stab bevel done.
both sides of the hinge are done. this is test fitting using the traditional Robart hinge points, only 2 of the them, one at the root and one at the tip.
deflection up and down is more than adequate.
Here is the fun step. Using the K&S piano wire, the hinge points are carefully placed into the holes on one side.
They are then pushed in all the way, til the wire bottoms out onto the edge of the balsa.
other side is on now.
the LE of the counterbalance is in line with the LE of the stab.
You can see, the wire acts to seal the gap as well. Cannot see day light thru the gap.
Now, time to do the other side.