First, I want to say that I am probably going way, way overboard
here. My instincts for wiring harnesses were developed working on systems that carried video over shielded twisted pairs, in 100 feet of cable that was also carrying raw vehicle power in wires laying right next to the video. Video is way way
more noise sensitive than the digital signals that tell the ESC what to do, and your motors draw way way
less current than the stuff that was making that video.
So you can probably wire your plane any old which way, and it'll probably work just fine
Thanks Tim. I am a newbie to the total electrics, that is why the silly questions.
I have not heard of the "twisting" of a run of wires. Do we know why that would reduce the effect of high voltage on very low voltage?
First, your voltage differences here aren't all that significant. What is significant is the current in the wires. Current induces magnetic fields around the wires that carry the current (like the battery wires). Varying current induces varying magnetic fields. Those varying fields will, in turn, induce voltage on nearby wires -- like your signal wires. The more current that's induced, the more voltage will be induced (hence the concern). The less overall coupling there is between the sets of wires, the less voltage will be induced.
If you arrange sets of wires so that all the wires in the set are laying close together then they'll tend to cancel out their own magnetic fields, and they'll tend to be less sensitive to impinging magnetic fields. So you want you want the wires dressed so that related wires (like the + and - battery wire) are tight together. Twisting the wires a bit helps to keep them laying together.
Twisting the wires also helps because if you have the + battery lead laying against the signal lead, then a little while later the - battery lead doing the same thing, then the effects of the current in that battery lead will tend to cancel out. So if you twist the two sets of wires with a different pitch then you'll reduce the coupling still further. This is easy enough with battery wires and signal wires -- just twist them naturally, enough so they hold together, and because they're such different sizes they'll naturally tend to have different twist pitches.
So twist reduces coupling because it reduces the distance between the wires, and because it breaks up the tendency for wires to "talk" to each other.
I won't really have any right angle relations of wiring that I can envision. Batteries in the body; ESC and motors in the nacelles. Therefore the power wires run parallel to the wingspan. Clancy's decoder (similar to the receiver in R/C) will be in the body also with control wires running out to the nacelles parallel to the power wires. I probably can separate those two runs by as much as 6 inches.
Use right angle relations if you can. If you were to run the battery wires and the signal wires (both ground and signal to the ESC) randomly in a tray, then you may 'un-luck' out and cause ESC problems. Chances are low that this will happen. You've got a bigger chance that a loose connection in a battery ground wire will mess you up.
Twist the wires enough so that they're neat and tidy, run the signal wires an inch or more away from the battery leads if it's convenient (and run them right together if its not), and make sure you have good battery connections, and you should be fine.
Are you running one battery per motor, or one battery for the whole plane? How many cells?
Clancy's system can run with a BEC or a separate battery to power it and any servos. I think I am going to use a separate battery source instead of the BEC. Would that eliminate the need to cut the power wire?
The BEC is going to try to power your receiver if you connect it up. With two BECs and a battery in there, you'd have three different power sources and just one power sink, all connected to the same piece of metal. Chances are high that what would actually happen would be that the BECs would just float and not deliver any current -- but one or the other of them may also try to charge your battery for you, in a totally uncontrolled fashion. Unless Clancy's system leaves the power leads unconnected for you, clip those leads!