Flight Testing - Trim Tabs

One of the objectives of flight-testing was to get the place "dialed in". This meant trimming the airplane for smooth, hands off flight. Initially, I had a mild left-rolling tendency. It didn't take much stick pressure to correct it (maybe 1 pound of pressure), but none the less, it needed to be trimmed out.

I've read about the technique of pinching the trailing edge of one aileron to correct a rolling tendency, but there are other methods of accomplishing this as well, namely dropping on flap or adding a fixed trim tab to the underside of the aileron.

The simplest and most non-permanent method was to drop one flap. For my plane, lowering the left flap by two turns on the rod-end proved just about perfect. If you do this, make sure you ensure the rod end is still engaged adequately on the threaded stud by poking a wire into the witness hole drilled into the side of the rod-end. If the threaded stud blocks the wire, all's well.

The pitch trim system is very effective as detailed in the plans. Although the trim tab may look too small, it works great! There is not quite enough travel/area on the tab to allow hands off descent at 70 mph with full flaps, but it's close enough that it only takes the slightest back pressure on the stick to hold the approach.

The rudder has proved to be very powerful and well balanced. No trim tab appears necessary.


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Updated: 25 Jan 08