OP38 – Aileron Trim

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I wanted to do the Aileron Trim work prior to attaching the bottom wing skin.

A few parts to deburr … oooh, goodie! I’ve been missing it!

Having chosen an access plate, & once positioned, the Trim Actuation Assembly is match drilled.


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The manual says do all this once riveted, but I wanted to final drill the holes prior to priming.

The holes in the trim servo are match drilled into pilot holes in the assembly.

I assembled all the components to ensure correct geometry.


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After priming some easy riveting for once.


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I haven’t worked out yet the logic of the wire routing … it comes out of the side through a bush, and then into a Molex Micro connector which in turn is located in the assembly side … so the wing wires will have to go inside the assembly to get to the Molex.

I guess it’ll become clear??


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Nutplates complete the assembly.


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I used a 9 volt battery to run the servo to full deflection each way, and then positioned it back to neutral ready to mark the aileron pushrod.


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Having screwed the access plate into position, and set the aileron pushrod to the neutral using the template, it was an easy job to mark the trim neutral position.


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Having clamped the pushrod into position using a set square on the rod end, I used another set square to mark the centreline of the spring brackets on the perpendicular.

I checked several times I was about to drill the holes in the correct place!!


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I drilled the first holes having marked them using a centre punch …


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… and then clecoed on the brackets.

Since I couldn’t work out a way to clamp the brackets firmly, I centre punched again to help stop the drill bit from wandering.


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This seemed to work well.


The spring brackets are riveted with LP4-3’s : )

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