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  #1  
Old 02-27-2021, 03:05 PM
wirejock's Avatar
wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 4,377
Default Bowden Cable Firewall Pass Thru

I can't take credit for this. Dan Langhout posted it back in 2011 but I can't find it. Thank goodness I saved a pdf copy.

These are the fittings I found worked best.
Aluminum will certainly work. Lighter and cheaper but steel fittings are recommended FWF and the wholenidea is a fireproof penetration. You may consider some 3M 2000 inside the fitting before locking it down. The cable in the photo is actually passing through backwards. You'll figure it out.

AN819-4 AN FITTING
AN832-4 STEEL FLARED UNION
AN818-4 STEEL NUT
AN924-4 Steel AN Fitting
3/16" or 1/4" Brass Ferrule
Stainless washers
I bought stainless washers and used a step drill to increase the hole diameter. 7/16" for AN4 fittings.

Measure your cable first.
The smaller push-pull Bowden cable...
Drill the fitting with a #13 drill then a #12 reamer. Use the 3/16" ferrule.
Larger Bowden cable, use the 1/4" ferrule
Click image for larger version

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Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 01/01/2021, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
Empennage, wings, fuse, finishing kit, now FWF
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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  #2  
Old 02-27-2021, 03:17 PM
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bjdecker bjdecker is offline
 
Join Date: Jun 2005
Location: Georgetown, TX
Posts: 626
Default

This...

https://www.aircraftspruce.com/catal...owdenclamp.php
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Brian Decker
Retired Firmware Guy and Airplane Builder

2020 RV-14 QB -- Under construction - Tailcone & Empennage Complete.
2018 RV-7 QB -- Built, Flying
2007 RV-7 QB -- Built, Drowned, Resurrected and flying
1998 RV-8 QB -- Started, Sold
1986 Mooney 205SE
1980 Mooney 231

Aided and abetted building a number of other RV's.
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  #3  
Old 02-27-2021, 03:18 PM
alpinelakespilot2000 alpinelakespilot2000 is offline
 
Join Date: Jan 2005
Posts: 3,703
Default

Or go to hardware store, buy a bolt large enough to drill a 3/16 hole through plus a couple washers and nut. Same idea but much cheaper. Learned that from Sport Aviation magazine.
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Steve M.
Ellensburg WA
RV-9 Flying, 0-320, Catto

Donation reminder: Jan. 2022
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  #4  
Old 02-27-2021, 03:25 PM
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Dan Langhout Dan Langhout is offline
 
Join Date: Mar 2008
Location: Huntsville, AL USA
Posts: 577
Default You've got it covered . . . . . .

. . . . . . . but here is a link to the original post.
https://vansairforce.net/community/s...45&postcount=4
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Dan Langhout
2021 =VAF= Dues PAID . . . . .
RV-7 N528DP slow build
First Flight July 26th, 2014
762 hours and counting . . . .
Now based at Moontown (3M5)
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  #5  
Old 02-27-2021, 04:20 PM
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mfleming mfleming is offline
 
Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 674
Default

That looks great but I'm so tired of being nickel and dime to death with shipping.

I'm buying this compression union from my local hardware store and calling it good.

EAA video on using this compression union. (need EAA login to view)
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Michael Fleming
Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
Wings completed 12/2017
Started on QB fuselage 01/2018
Sliding canopy mostly completed 10/2020
Wiring completed
Avionics harness build in progress
Donated for 2021 and so should you
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  #6  
Old 02-27-2021, 04:31 PM
Scott Hersha Scott Hersha is offline
 
Join Date: Jan 2005
Location: Cincinnati, OH
Posts: 1,807
Default

Great idea Larry! I like it. Squirt some high temp goop in there and you’re done. I have the stuff that DanH recommended for firewall sealing on hand (2,000* +) and that should keep me safe.
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SH
RV6/2001 built/sold 2005
RV8 Fastback/2008 built/sold 2015
RV4/bought 2016/sold/2017
RV8/2018 built/Sold(sadly)
RV4/bought 2019 Flying
Cincinnati, OH/KHAO
JAN2021
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  #7  
Old 02-27-2021, 04:33 PM
wirejock's Avatar
wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 4,377
Default Nickel and dime

Love how we nickle and dime on a Firewall Pass Thru then blow $30K on an engine.
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Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 01/01/2021, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
Empennage, wings, fuse, finishing kit, now FWF
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
Reply With Quote
  #8  
Old 02-27-2021, 05:25 PM
mfleming's Avatar
mfleming mfleming is offline
 
Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 674
Default

Quote:
Originally Posted by wirejock View Post
Love how we nickle and dime on a Firewall Pass Thru then blow $30K on an engine.

Hahaha...that is so true. I get wrapped around the axel when I have to pay $12 for a $8 item...it's not rational but oh well.
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Michael Fleming
Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
Wings completed 12/2017
Started on QB fuselage 01/2018
Sliding canopy mostly completed 10/2020
Wiring completed
Avionics harness build in progress
Donated for 2021 and so should you
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  #9  
Old 02-27-2021, 05:30 PM
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PaulvS PaulvS is online now
 
Join Date: Aug 2019
Location: Western Australia
Posts: 571
Default

Quote:
Originally Posted by mfleming View Post
Hahaha...that is so true. I get wrapped around the axel when I have to pay $12 for a $8 item...it's not rational but oh well.
Wait until you have to pay $100 international shipping for a $8 item!
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Paul vS (yes I'm also a Van)
Building RV-6A #22320 O-320 FP. Wings and tail complete, working on fuselage
Flying my Aeroprakt A-22 STOL and the aero club's RV-9A while I build
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  #10  
Old 02-27-2021, 05:38 PM
JRichichi JRichichi is offline
 
Join Date: Mar 2013
Location: League City, TX
Posts: 96
Default the REAL cost of building an airplane...

When I was thinking about building an airplane, I read that you'll spend 1/3 on the engine, 1/3 on the avionics, and 1/3 on the airframe. What they didn't say was I would spend another 1/3 on tools and another 1/3 on shipping...

Last edited by JRichichi : 02-28-2021 at 03:51 AM.
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