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Tims Lightning XS
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Date: 9-6-2017
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Number of Hours: 3.50
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Manual Reference: 40 ish
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Brief Description: Setting the Main Gear Alignment
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Once again, the manual wasn't much help here. I got an idea to use geometry from another builder to set the toe-in. I also spoke with Jason at Arion HQ. He said they set the alignment straight, then shim in a degree or so with washers behind the aft axel bolts.
If the goal is to have one degree of toe-in, I decided to do that. If I get a shimmy during fast taxi, landing, or take-off, I can use washers to either toe-in more, or set straighter.
Here's the math. There are 360 degrees in a circle. The circumference of a circle is pi*diameter. If I make a mark 5 feet (60 inches) away from the wheel and use a laser lever to define a straight line along my facotry tile floor, then all I have to do is then toe-in the wheel a bit over an inch. See photos. This was really very easy. Once the position was set, I drilled through the gear legs and spar box to set it permanently.
Here's the formula: 3.14159(120)=377, 377/360=1.047'/degree. I figure that at 5 feet, the curvature of the circumference over an inch is within the margin of error. Plus, the 1" toe-in is a starting point anyway. It's like reheating your coffee in the microwave for a minute. Nothing magical about 60 seconds. A bit more or a bit less will still work.
OK, I oversimplified a bit, but you get the message. I did spend a lot of time with plum bobs making sure the plane was parallel to the tile lines. The roll of tape and the box was used to see the level line from the laser.
If you're building a lightning and have questions about this, call me. It's really quite easy with this technique.
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Right main
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Left Main
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Bolt throught the gear leg and spar box sleve.
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