VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

  #11  
Old 09-25-2018, 07:54 PM
RV10Pilot RV10Pilot is offline
 
Join Date: Jan 2005
Location: Medford, NJ USA
Posts: 110
Default pass through

I used one of these Blue Sea Systems Terminal Feed through Connector
Reply With Quote
  #12  
Old 09-25-2018, 08:22 PM
rv7charlie rv7charlie is online now
 
Join Date: May 2006
Location: Pocahontas MS
Posts: 3,071
Default

Here are a few things to think about. First, the technique described in the Aeroelectric book is approved for/used in certified a/c, so it must do a pretty good job of fire and CO protection. (Using intumescient caulk will improve performance over the old certified technique.) Next, it removes two connections in a high current feed line. The feed-through devices shown so far seem to have plastic insulators, which will disappear pretty quickly in a fire. They also add the two additional break points (plus the break points for the pair of cable terminals) mentioned earlier.

So, unless you can find some feed-throughs with ceramic insulators, there is risk if there is a fire, and regardless, there's almost certainly going to be higher resistance in the high current feed line due to the extra connections. There's also the reliability question with the added connections.

Not trying to tell anyone what to do; just trying to supply some things to think about.

Charlie
Reply With Quote
  #13  
Old 09-25-2018, 09:06 PM
AviatorJ AviatorJ is offline
 
Join Date: Feb 2015
Location: Oklahoma City
Posts: 670
Default

I did exactly what Carl suggested. However once I finished all my runs I filled each fitting up with 3M fire barrier too.
__________________
Justin
RV-10 Quickbuild 'Avionics and Interior'
http://operationrv10.blogspot.com/
Donated for 2018
Reply With Quote
  #14  
Old 09-25-2018, 11:46 PM
rocketman1988 rocketman1988 is offline
 
Join Date: Jun 2010
Location: Sunman, IN
Posts: 1,078
Default then...

"...So, unless you can find some feed-throughs with ceramic insulators, there is risk if there is a fire, and regardless, there's almost certainly going to be higher resistance in the high current feed line due to the extra connections. There's also the reliability question with the added connections.

Not trying to tell anyone what to do; just trying to supply some things to think about..."

Then I guess I probably shouldn't say that I'm using electronic fuel injection and ignition, electronic linear actuators for heat valves and oil cooler valve controlled by an arduino, an uninsulated firewall, welding cable for contactor wiring, and firewall pass throughs.
__________________
Bob
Aerospace Engineer '88

RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
Doors - Done
On Gear
290 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful

Dues Paid 2017,...Thanks DR+
Reply With Quote
  #15  
Old 09-26-2018, 06:28 AM
rleffler's Avatar
rleffler rleffler is offline
 
Join Date: Jun 2006
Location: Delaware, OH (KDLZ)
Posts: 3,973
Default

Blue Sea Systems also sells something similar, which is what I used. It's design intent was for marine use in waterproof bulkheads.
__________________
Bob Leffler
N410BL - RV10 Flying
http://mykitlog.com/rleffler
Reply With Quote
  #16  
Old 09-26-2018, 06:33 AM
MConner MConner is offline
 
Join Date: Mar 2018
Location: Snead Island, Florida
Posts: 96
Default

I did not build my -10 but there have been flying Learjets for decades. In years past there have been jets lost due to chafing of the un-fused battery wiring. There is now a requirement to check the wiring for chafing during routine maintenence (condition) inspections. All of our un-fused wiring is held tightly in place with Adel clamps and has chafe sleeve over it.

This thread has me wondering if my -10 wiring from aft battery to the starter solenoid is vulnerable to chafing that could cause a fire. Is it common to add any chafe protection to this fairly long wire run?
__________________
Mark
RV-10
Bought not built
48X
Reply With Quote
  #17  
Old 09-26-2018, 07:04 AM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 1,668
Default

It is common to take steps to prevent wire chafing, no matter what the gauge. Many options available on how to do this. You select the appropriate method based on the specific circumstance.

Carl
Reply With Quote
  #18  
Old 09-26-2018, 07:08 AM
rv7charlie rv7charlie is online now
 
Join Date: May 2006
Location: Pocahontas MS
Posts: 3,071
Default

Quote:
Originally Posted by rocketman1988 View Post
"...So, unless you can find some feed-throughs with ceramic insulators, there is risk if there is a fire, and regardless, there's almost certainly going to be higher resistance in the high current feed line due to the extra connections. There's also the reliability question with the added connections.

Not trying to tell anyone what to do; just trying to supply some things to think about..."

Then I guess I probably shouldn't say that I'm using electronic fuel injection and ignition, electronic linear actuators for heat valves and oil cooler valve controlled by an arduino, an uninsulated firewall, welding cable for contactor wiring, and firewall pass throughs.
Sarcasm is more fun if there's a point to it.

I too will be using an alternative engine controller (that controls an alternative engine, which is a risk I'm assuming you're *not* taking). I, too, have an uninsulated firewall, and welding cable for my 'fat' wires. And after a few careers in electronics fields spanning 4 decades, I don't have many electronic control whizzies because it's no longer that interesting to me and for most of my needs, simpler/lighter to do it manually. Everybody has to have firewall passthroughs of some type. The only reason for my previous post is that someone might be making a choice of passthrough *method* and *device* without knowing (through inexperience or misinformation) all the upsides and downsides of each choice.

Last edited by rv7charlie : 09-26-2018 at 07:11 AM.
Reply With Quote
  #19  
Old 09-26-2018, 07:16 AM
ScottCC ScottCC is offline
 
Join Date: Feb 2018
Location: Peachtree City
Posts: 11
Default

Jason, I was actually just looking at that one. How do you like it? are you able to get an insulated cover over it?
__________________
Scott Calkins
Building RV-10
Working on section 33 - Baggage Area
Dues happily paid 2018
Reply With Quote
  #20  
Old 09-26-2018, 10:27 AM
rocketman1988 rocketman1988 is offline
 
Join Date: Jun 2010
Location: Sunman, IN
Posts: 1,078
Default

Quote:
Originally Posted by rv7charlie View Post
Sarcasm is more fun if there's a point to it.

I too will be using an alternative engine controller (that controls an alternative engine, which is a risk I'm assuming you're *not* taking). I, too, have an uninsulated firewall, and welding cable for my 'fat' wires. And after a few careers in electronics fields spanning 4 decades, I don't have many electronic control whizzies because it's no longer that interesting to me and for most of my needs, simpler/lighter to do it manually. Everybody has to have firewall passthroughs of some type. The only reason for my previous post is that someone might be making a choice of passthrough *method* and *device* without knowing (through inexperience or misinformation) all the upsides and downsides of each choice.
My comment wasn't meant as an attack of any kind...sorry but there is no tone in this type of communication.

After several reply drafts I came to the conclusion that debating this isn't worth it.

Everyone must do their own risk assessment and decide what is above their "safe" threshold.
__________________
Bob
Aerospace Engineer '88

RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
Doors - Done
On Gear
290 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful

Dues Paid 2017,...Thanks DR+
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 09:36 PM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.