Project: jseaborn     -     Entry

Jan 28, 2020 1 Trim servo work and rudder mounted strobe/antenna. Category: Empennage
Having looked at the great collection of photos that Ray took when he received and disassembled the plane, I realized that I had the trim servo arm in the wrong position. It can travel a full 360 degrees and I had the arm positioned 180 degrees from where it was supposed to be. I connected the servo motor up to some power and rotated it the required 180 degrees. While I was at it, it was a good opportunity to experiment with the trim indicator gauge. Experimenting a bit I figured out how it was supposed to be connected.

The trim position indicator in the cockpit is in French. The instrument has the title TAB and it has a needle that swings between two extremes. The one extreme is titled CABRE and the other extreme is titled PIQUE. My thoughts are CABRE refers to CLIMB and PIQUE refers to DIVE.

My reasoning is that CABRE translates literally to REAR. If I put that in the context of a horse, a horse that rears is on it's hind legs and it's front end is certainly higher. PIQUE translates into PIKE, which also implies stab, as into the ground. So my reasoning is that's the trim set for nose down or diving attitude.

See attached photos. As you can see the trim indicator moves in relation to the trim tab.

One of the improvements I'm making on the plane is to provide capability to add strobe and position lights and the potential for ADS-B out. This requires a special antenna for ADS-B. I really like the antennas that uAvionix has developed that are direct replacement for the standard lights. This requires a mounting area on the rudder. I spent a bit of time trying to determine the ideal location both for antenna operation and structural integrity of the rudder. One of the risks is that it locates the antenna about shin level. Anyone walking around the tail of the plane risks running into the antenna.


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