Joined: 05 Feb 2007
Location: Syracuse, NY
|Posted: Fri Nov 17, 2017 1:45 pm Post subject: Grounding question
I just wanted to get back to say thanks to all for their input on this issue. I've pondered this a bit and I'm going to do what Bob did and run a #8 wire for the ground to the panel, and let the airframe be the starter return path. This seems like a nice compromise between saving a little weight and having a good reliable ground for the avionics.
|>> Tcwtech <rnewman(at)tcwtech.com> 10/19/2017 12:46 PM >>>
--> RV10-List message posted by: Tcwtech <rnewman(at)tcwtech.com>
I used the same Akzo Noble primer on my RV-10, all skins are primed including both sides of all lap joints. ( This primer is amazing stuff, does stink like all heck, but really tough and protective. Weâ€™ve used this on the eight airplanes we have built now over more than 20 years now, and can say it has held up extremely well.)
I did not run a separate #2 wire up to the front. All ground current for the starter, alternator and engine sensors flows back through the airframe. I do have a #8 ground wire running from the battery to a ground bus up under the instrument panel solely for the avionics.
I have absolutely no electrical issues or noise problems in this airplane.
TCW Technologies, LLC
| On Oct 19, 2017, at 11:58 AM, Tim Olson <Tim(at)MyRV10.com> wrote:
--> RV10-List message posted by: Tim Olson <Tim(at)MyRV10.com>
+1. I ran an independent #2 ground.
That said, with the number of rivets in the airframe I'm sure you'll be fine as long as you ground to something with a lot of rivets in it.
I just wanted as low a resistance path to my forest of tabs as
> On 10/19/2017 10:42 AM, Phillip Perry wrote:
> Sent from my iPhone
>> On Oct 19, 2017, at 10:35 AM, Shannon Hicks <civeng123(at)gmail.com <mailto:civeng123(at)gmail.com>> wrote:
>> I used a forest of tabs mounted to my firewall with a #2 (I think) cable run from there all the way back to the battery ground in the tailcone. I'm not sure if it was overkill, but I have had zero issues so far.
>> I think the plans ground path is through the skin to the battery tray where you ground the battery.
>> On Thu, Oct 19, 2017 at 10:27 AM, Kent Ogden <ogdenk(at)upstate.edu <mailto:ogdenk(at)upstate.edu>> wrote:
>> I have a question/concern regarding a ground return to the
>> battery. I have primed all my parts and skins with the Akzo Nobel
>> 2 part primer, which is awesome stuff though it's a smelly pain to
>> work with. All skin overlaps have been primed on both sides of
>> the overlap, and this stuff is not conductive at all so the only
>> electrical path is through the rivets and the small area of the
>> rivet hole that doesn't always have primer covering it. On the
>> outside of the plane the rivet heads have contact directly with
>> the unprimed skin so it's really the inside skin where there is
>> minimal area in electrical contact.
>> I am concerned that using the skin as a ground return to the
>> battery may not provide an excellent ground path, especially for
>> the large currents needed for engine cranking. I would really
>> rather not have to run another heavy wire to the front of the
>> airplane for ground, but I will if necessary.
>> Has anyone else faced this issue and had a problem (or no problem)
>> using the skin as a ground return? Also, where/how have people
>> connected the battery ground to the tailcone skin, do you use a
>> piece of brass or copper buss bar riveted to the bottom skin or
>> something like that?
>> Thanks for any suggestions!
>> Kent Ogden
>> #40710 ultra slow-build
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