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07-31-2016, 12:41 PM
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Join Date: Sep 2006
Location: Landing field "12VA"
Posts: 1,530
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Fuselage cable routing question
Contemplating wire runs from the battery and tail forward to the cockpit/panel area, while my build is at the full-length canoe stage. I see lightening/pass-through holes aplenty in the bulkheads on the right side, but they vanish at the spar web carry-through. What's the secret for routing cables forward further than the spar center section? Can they go over the spar but under the front seats? I lack a completed 10 to look at, so any description of what I should be doing to install conduit and route cables from tail to nose while I have decent access to the aft tail cone area would be appreciated.
__________________
Bill Boyd
Hop-Along Aerodrome (12VA)
RV-6A - N30YD - Built '98 / sold '20
RV-10 - N130YD reserved - under construction
donating monthly to the VAF - thanks, Doug
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07-31-2016, 12:53 PM
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Join Date: Jan 2005
Location: Tampa, FL
Posts: 2,861
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Typically moving aft to forward a lot of folks install conduit under the baggage area and aim towards the sides by the rear seats to route wires up both sides over the spar.
__________________
Todd "I drink and know things" Stovall
PP ASEL-IA
RV-10 N728TT - Flying!
WAR EAGLE!
Last edited by Auburntsts : 07-31-2016 at 12:58 PM.
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07-31-2016, 01:53 PM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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Quote:
Originally Posted by Auburntsts
Typically moving aft to forward a lot of folks install conduit under the baggage area and aim towards the sides by the rear seats to route wires up both sides over the spar.
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Yep, what he said.
Conduit under baggage.
Side over spar/under door.
You can get a lot of wiring through this area if you take your time and plan the routing.
__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011 
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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08-01-2016, 10:58 AM
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Join Date: Aug 2015
Location: Hurricane Utah
Posts: 156
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a baggage compartment option
I am running two ~3/4 conduits under each side of the baggage area, holes already there, just made a bit larger. They exit nicely in the area that is always fully accessible. Once at the seats they go up and through the 2 5/8" bushings each side that gets us to the panel. I am also making the baggage compartment side cover (right side) removable so I can gain access to that area for a wire run coming through F-1006C. I just prefer to see and inspect wires if at all possible.
With current led lights, dynon txpder/AP servo, battery, and ELT in the back, I have very few wires, and most 20 to 22 gage, running to the back of the plane from the panel, barely enough to fill one 3/4" let alone two. Since COM antennas etc and of course all the wing wiring never need go past the passenger feet area and avionics are getting smarter and draw less current, the need for a lot of "wire capacity" is low on my radar.
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08-01-2016, 11:53 AM
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Join Date: Jun 2010
Location: Sunman, IN
Posts: 2,189
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They add up...
Been doing some thinking on this lately and the wires do start to add up.
For example:
LED tail light/strobe - 5 wires (PWR pos, PWR strobe, Sync, GND, Shield)
Elevator Trim - 5 wires
Pitch Servo - 6 wires
Magnetometer for G3X - 7 wires
Main Battery - 1 BIG wire (maybe two)
Master wiring - 1 wire
ELT activation - 1 telephone style cable
and that doesn't include any other things that might be located back there. I am of the opinion that I would rather have too many conduits beneath that area than not enough...
__________________
Bob
Aerospace Engineer '88
RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
EFII System 32 - Done
297 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful
Wiring...
Dues+ Paid 2019,...Thanks DR+
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08-01-2016, 02:56 PM
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Join Date: Feb 2015
Location: Locust Grove, GA
Posts: 621
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Pleading ignorance
Quote:
Originally Posted by Mike S
Yep, what he said.
Conduit under baggage.
Side over spar/under door.
You can get a lot of wiring through this area if you take your time and plan the routing.
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The pictures with the electrical insulating bushings make me think you are actually using PVC conduit and not the flexible (black) conduit Van's sells or is available from automotive supply houses?
If it's the flexible conduit, how are you attaching the bushings to the end?
Starting fuselage build next month in Oregon - so trying to understand the best practices of the experts that have figured it out.
Thanks much!
__________________
Krea Ellis
Locust Grove, GA
DA20-A1 "Princess Amelia" - gone home to Amelia Island
RV-7A Phase 2
RV-10 under construction at Synergy Air South
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08-01-2016, 04:02 PM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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Quote:
Originally Posted by KatanaPilot
The pictures with the electrical insulating bushings make me think you are actually using PVC conduit and not the flexible (black) conduit Van's sells or is available from automotive supply houses?
Yes, correct.
If it's the flexible conduit, how are you attaching the bushings to the end?
They just glue on with PVC glue.
Starting fuselage build next month in Oregon - so trying to understand the best practices of the experts that have figured it out.
Not an expert by any stretch of the imagination----just showing how I did it.
Thanks much!
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See answers in red.
__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011 
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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08-01-2016, 07:31 PM
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Join Date: Aug 2015
Location: Hurricane Utah
Posts: 156
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ran a quick experiment...
Ran the test to back up my "estimate" on the 3/4" bushing capacity. Certainly understand the idea of more is better, running out just creates a bit of a mess....
So here is what fit in one 3/4" std vans bushing...
Dynon AP std connection (6 wires) with gnd at servo
Dynon txpder power & communication wires (3) with local gnd
#2 gage for battery pos and 2 x 18 gauge for power up and back to master
ELT "telephone wire"
strobe, position, and sync (2 x 20 with 22 ga sync), ground local at back
2020 GPS wires, std Dynon install with 4 wires to panel
single 5-wire bundle to elevator trim
What remains in my install is the 1/4" static line up front. This will leave enough room for about 20 x 20 gauge wires aft of the baggage compartment or other big wires like another #2 for gnd if one choses. Note I did not even include the access I am planning along the right side baggage panel (removable). This will be my, oh forgot about that.......  place to escape and still look very tight and professional.
Cheers, Mike
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08-01-2016, 10:38 PM
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Join Date: Aug 2015
Location: Hurricane Utah
Posts: 156
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step access panel in baggage floor
Bill,
One last comment, I followed some advice on the forum about installing inspection panels (std vans used on stall warning indicator access) in the baggage floor just over the step attachment bolt, saves needing to drill through the bottom skin, allows for step adjustment and/or replacement, and gives great access to this area that is prime for running wires/conduit . Provides easy inspection in that covered area which I really like to have as well for many years to come.
Cheers, Mike
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08-02-2016, 10:18 AM
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Join Date: Sep 2006
Location: Landing field "12VA"
Posts: 1,530
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Quote:
Originally Posted by Mike S
Yep, what he said.
Conduit under baggage.
Side over spar/under door.
You can get a lot of wiring through this area if you take your time and plan the routing.
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So, it's okay to drill holes in those side formers that attach to the spar web below the door opening (Sorry - no plans with me at work today for proper part call-out). Mine are presently undrilled, and I was not sure it was okay to violate them
Makes perfect sense, though. I presume one stays small and in the center of the web with whatever holes are needed here.
__________________
Bill Boyd
Hop-Along Aerodrome (12VA)
RV-6A - N30YD - Built '98 / sold '20
RV-10 - N130YD reserved - under construction
donating monthly to the VAF - thanks, Doug
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