As just mentioned, I'm going with a better quality optical kill switch for this plane than I started with. As with a couple other recent builds, this one will be getting an Ultra IBEC by Tech-Aero Designs. This switch is supposed to be better at filtering noise from the ignition module than other opti-kill switches. It's also got a built-in voltage regulator so I can pick what voltage the ignition module receives. Like other switches, it's also got an LED to let me know the ignition is live or not.
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For power distribution I'm still weighing my options, but I may go with a VR Pro Dualsky setup again. It's much smaller than the big power distribution board I was planning to use, and it's a simpler design. I ordered one now since it'll take a couple weeks to get here, and if it doesn't go on this plane it'll be used on another one soon enough.
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Also something that needs to be looked at (again?) is the fuel tank. I'm pretty sure I rebuilt it when I started doing all the work on this plane originally, but have no pictures to back that thought up. If it was rebuilt, it should (hopefully?) have the good flexible tubing inside for the clunk. The regular Tygon tube gets hard over time which makes it less effective. The plan is to pull the existing tank out to see if it's been rebuilt or not, and to possibly switch to a Fiji bottle with an aluminum cap. With all this stuff, I don't want to go back and have to do all the work again...!