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How do I build a Nav light system for my R/C planes? Answered

I want to build a Nav light system for my two R/C aircraft I have a E-flite Taylorcraft 450 and a Seagull Extra 300L


3mm LED set into the foam. Wire to coin cells for light weight.

I presume you mean the red and green lights on the wingtips, and so on? If so: I'd suggest LEDs; they're lightweight and don't draw much power. Up to you to figure out how to run the wires and where to place the battery so it doesn't destabilize the plane. But if you can find a local R/C plane club, I'd bet someone there could either help you or point you to a magazine article which describes how someone else did it.