RE: RF Ignition Interference
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In reality, the location of the receicer is usually determined by the length of the servo leads. Where they all meet is where the receiver usually goes. 99 times out of a 100 it will be a good distance from the engine/ignition. Same holds true for ignition batteries and switches. The length of the wires is pretty much where they end up. It's almost a natural that they end up well separated.
Now, I'm not, nor have I ever professed to be, an engineer of any type, let alone electrical, so I don't try to over analyze designs or products. I just go with what always works. If I want to drive a nail, I hit the darn thing with a hammer. I don't attempt to determine how much kinetic energy and angular force is required in to set the nail.
If I was to seriously take a look at all the things that could go wrong with a radio controlled plane, I would like as not take up model railroading.