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Rear Heat Duct (Scat Tube)

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AirMike

Joined: 27 Feb 2007
Posts: 514
Location: Nevada

Posted: Mon Oct 06, 2008 10:04 pm Post subject: Rear Heat Duct (Scat Tube)

The plans in section 50 say to deform the Scat tube where it passes over the fuel selector valve. I am having difficulty deforming my scat tube enough to put the front section of the cover on the tunnel. Also the screws from the fasteners will perforate the scat tube. Has anyone used a splitter or run the tube below the valve between the fuel lines and the valve?



I imagine that Vans has a reason for doing it this way (on top) but I cannot for the life of me figure out why.

_________________
See you OSH '18
Q/B - sold.

ron.mcgann(at)baesystems.
Guest

Posted: Mon Oct 06, 2008 10:17 pm Post subject: Rear Heat Duct (Scat Tube)

Yes I found this to be a mongrel of a job and my scat now has some

strategically placed heatshrink tape and some additional layers of

electrical tape where the nutplates punched a nice hole while 'deforming

to fit'. 



Cheers

Ron

-187 painting

--

Albert Gardner

Joined: 10 Jan 2006
Posts: 455
Location: Yuma, AZ

Posted: Mon Oct 06, 2008 10:32 pm Post subject: Rear Heat Duct (Scat Tube)

You can run the tube where ever you want keeping in mind that you will want

to be able to inspect/replace the fuel filter and have access to items in

the tunnel. If you plan on running it underneath the selector make sure it

does not interfere with the fuel lines. Some builders have placed the

selector much lower than Van did and used an extension shaft for the

selector knob. The fuel line routing from an Andair selector is somewhat

different that from Vans fuel selector.

Albert Gardner

Yuma, AZ



--

_________________
RV-9A N872RV
RV-10 N991RV

Tim Olson

Joined: 25 Jan 2007
Posts: 2872

Posted: Tue Oct 07, 2008 3:26 am Post subject: Rear Heat Duct (Scat Tube)

I know at least one person who put in a reducer and used smaller

sized duct going by the valve, or it wouldn't have fit very

well.



Myself though, I used the Andair valve with a handle extension.

This keeps the fuel lines down lower, away from that hot

(yes, it gets pretty hot) SCAT tube, and gives more room for

it to pass between the valve handle extension and the tunnel wall,

also keeping it more clear from those screws, nutplates, and

rudder cables.



Tim Olson - RV-10 N104CD - Flying



AirMike wrote:

 	  Quote: 	
		   

 

 The plans in section 50 say to deform the Scat tube where it passes

 over the fuel selector valve. I am having difficulty deforming my

 scat tube enough to put the front section of the cover on the tunnel.

 Also the screws from the fasteners will perforate the scat tube. Has

 anyone used a splitter or run the tube below the valve between the

 fuel lines and the valve?

 

 I imagine that Vans has a reason for doing it this way (on top) but I

 cannot for the life of me figure out why.

 

 -------- OSH '08 or Bust (busted) be there in &quot;09 Q/B Kit -

 wiring and FWF

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p 7726#207726

aarongleixner(at)sbcgloba
Guest

Posted: Tue Oct 07, 2008 3:43 pm Post subject: Rear Heat Duct (Scat Tube)

I just struggled with the same issue recently and was unable to come up with an elegant solution.  Unfortunately this is just a case where Van's design department took a shortcut to the detriment of us all.  In the end, I ran the tube under the valve support, next to the valve.  This worked with a little flattening of the scat tube.  Use plenty of RTV to cushion the tube from the surrounding metal components.  I'm hopeful that there is enough space between the scat and valve that heat will not be a problem.  After trying several sample pieces, I was unable to get the scat over the top without puncturing the tubing in some way.  Would love to hear if others have developed a better solution using Van's valve setup.

 



--- On Tue, 10/7/08, AirMike <Mikeabel(at)Pacbell.net> wrote:



  	  Quote: 	
		  From: AirMike <Mikeabel(at)Pacbell.net>

Subject: Rear Heat Duct (Scat Tube)

To: rv10-list(at)matronics.com

Date: Tuesday, October 7, 2008, 2:04 AM



 	  Quote: 	
		  --> RV10-List message posted by: "AirMike"

<Mikeabel(at)Pacbell.net>



The plans in section 50 say to deform the Scat tube where it passes over the

fuel selector valve. I am having difficulty deforming my scat tube enough to put

the front section of the cover on the tunnel. Also the screws from the fasteners

will perforate the scat tube. Has anyone used a splitter or run the tube below

the valve between the fuel lines and the valve?



I imagine that Vans has a reason for doing it this way (on top) but I cannot

for the life of me figure out why.



--------

OSH '08 or Bust (busted) be there in &quot;09

Q/B Kit - wiring and FWF





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p 7726#207726





	
	
 [quote][b]

GenGrumpy(at)aol.com
Guest

Posted: Tue Oct 07, 2008 4:18 pm Post subject: Rear Heat Duct (Scat Tube)

I ran mine across the top just like Van said.  The scat tube is a  little crimped with the tunnel top installed, but I get plenty of air to the  rear outlets....

  

 grumpy

 N184JM

  

 do not archive

  

 In a message dated 10/7/2008 6:27:47 A.M. Central Daylight Time,  Tim(at)MyRV10.com writes:

  	  Quote: 	
		  -->    RV10-List message posted by: Tim Olson <Tim(at)myrv10.com>



I know at    least one person who put in a reducer and used smaller

sized duct going by    the valve, or it wouldn't have fit very

well.



Myself though, I used    the Andair valve with a handle extension.

This keeps the fuel lines down    lower, away from that hot

(yes, it gets pretty hot) SCAT tube, and gives    more room for

it to pass between the valve handle extension and the tunnel    wall,

also keeping it more clear from those screws, nutplates,    and

rudder cables.



Tim Olson - RV-10 N104CD -    Flying



AirMike wrote:

 	  Quote: 	
		   --> RV10-List message posted    by: "AirMike" <Mikeabel(at)Pacbell.net>

 

 The plans in    section 50 say to deform the Scat tube where it passes

 over the fuel    selector valve. I am having difficulty deforming my

 scat tube enough    to put the front section of the cover on the tunnel.

 Also the screws    from the fasteners will perforate the scat tube. Has

 anyone used a    splitter or run the tube below the valve between the

 fuel lines and    the valve?

 

 I imagine that Vans has a reason for doing it this    way (on top) but I

 cannot for the life of me figure out why.

    

 -------- OSH '08 or Bust (busted) be there in &quot;09 Q/B Kit    -

 wiring and FWF

 

 

 

 

 Read this    topic online here:

 

    http://forums.matronics.com/viewtopic.php?p=207726#207726

 

    es  y       -->                 - MATRONICS WEB FORUMS  nbsp;               - List Contribution Web Site  ;                             =========================


	


	


 

  



New MapQuest Local shows what's happening at your destination.  Dining, Movies, Events, News & more. Try it out!

  [quote][b]

coop85(at)cableone.net
Guest

Posted: Tue Oct 07, 2008 4:49 pm Post subject: Rear Heat Duct (Scat Tube)

I managed to force mine into place per the plans but wasn't real impressed

with it.  When I upgraded to the Andair fuel valve I rerouted the hose to

below the valve.  Tim made some good comments about keeping the heat away

from the fuel lines, but the hose fits much better now and I haven't had any

issues.



Marcus.



--

AirMike

Joined: 27 Feb 2007
Posts: 514
Location: Nevada

Posted: Wed Oct 08, 2008 8:49 am Post subject: Rear Heat Duct (Scat Tube)

I wound up taking Aaron's suggestion and routing the line under the fuel valve. Worried about chafe, and took some measure to prevent it. Thanks again to all the great suggestions. I do not think that I could get through this project without this web site. Remember Matt when it is time for his annual donation.

_________________
See you OSH '18
Q/B - sold.

Tim Olson

Joined: 25 Jan 2007
Posts: 2872

Posted: Wed Oct 08, 2008 9:07 am Post subject: Rear Heat Duct (Scat Tube)

If you're going to run that SCAT right next to fuel lines or the

valve, I'd strongly recommend wrapping the line in reflective

1/4" insulation to keep the heat from being spread to the

valve and lines.



Tim Olson - RV-10 N104CD - Flying



AirMike wrote:

 	  Quote: 	
		   

 

 I wound up taking Aaron's suggestion and routing the line under the fuel valve. Worried about chafe, and took some measure to prevent it. Thanks again to all the great suggestions. I do not think that I could get through this project without this web site. Remember Matt when it is time for his annual donation.

 

 --------

 OSH '08 or Bust (busted) be there in &quot;09

 Q/B Kit - wiring and FWF

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p 7912#207912

AV8ORJWC

Joined: 13 Jul 2006
Posts: 1149
Location: Aurora, Oregon "Home of VANS"

Posted: Wed Oct 08, 2008 9:33 am Post subject: Rear Heat Duct (Scat Tube)

I second Tim's responsible post of separating combustible fluids from

electrical and heat sources.  The tunnel does not win any design awards

for either function or aesthetics.  Remember to leave access or ability

to remove obstructions when you need to service the fuel pump or fuel

filter.  Keep an eye open for chaffing.  After all these months, the

beauty of the Andair valve remains a wondrous improvement.



23 days to Matt's Annual Fund Drive



John Cox



--

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