11.2.2 Counterweight Fairings

This entry is part 10 of 17 in the series 11 - Fairings

The elevators have a counterweight at the outboard end to balance them. A pocket is cut into the canard to allow the elevator through it full movement. The weight on the outboard end isn’t enough to completely balance the elevators so additional weight is added to the center pivot. But to get the elevator perfectly balanced requires a LOT of weight at that center position. There were some reports of flutter developing with this setup so the factory has recommended adding the additional weight at the outboard position. This will require making the existing pocket larger. I thought about adding the weight outboard of the existing weight but that would have been a pain as my canard tips are hollow. So I decided to add the weight inboard of the existing weights. I checked with Scott at the factory and he said that would be fine.

Here’s the left side pocket with tape marking the cut.

After the cut is made and glassed in, I’ll have to make the fairing (the “bump” above the pocket) larger. Rather than make a new foam block and cover it with BID, Malcolm said that since it’s such a small amount that it would be good to just mold a addition out of thick micro. This is almost like sculpting. Which is one of the art things that I’m not good at.

So here’s Malcolm creating a new fairing addition.

And this is the final pocket and fairing.

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