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RV6/6A Fuel Tank Attachment

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n1cxo320(at)salidaco.com
Guest

Posted: Sun Mar 11, 2007 9:24 am Post subject: RV6/6A Fuel Tank Attachment

In preparation for replacing my loose slosh fuel  tanks I want to mount the inboard forward bracket attachment the way Van now  recommends it. My earlier plans just had you bolt the angle from the fuselage to  the angle from the fuel tank tip.

  

 How is the 'new' arrangement? Which angle bracket  gets the 1/4-inch slot? The tank one or the fuselage one?

 Also which goes forward - the tank bracket or the  fuselage bracket.? Which bracket gets the platenut?

  

 My search said that Rvator #1 of 1998 shows what  Van now recommends, but my old Rvators were given away long ago. If someone had  one handy and could e-mail me  what I believe is on page 11 of that issue I  would appreciate it. 

  

 Thanks for any help/insight.

  

 John

 n1cxo320(at)salidaco.com (n1cxo320(at)salidaco.com)

  

   [quote][b]

stevea(at)svpal.org
Guest

Posted: Sun Mar 11, 2007 10:50 am Post subject: RV6/6A Fuel Tank Attachment

John Fasching wrote:  	  Quote: 	
		              In preparation for replacing my loose slosh fuel tanks I want to mount the inboard forward bracket attachment the way Van now recommends it. My earlier plans just had you bolt the angle from the fuselage to the angle from the fuel tank tip.

    

   How is the 'new' arrangement? Which angle bracket gets the 1/4-inch slot? The tank one or the fuselage one?

   Also which goes forward - the tank bracket or the fuselage bracket.? Which bracket gets the platenut?

   

 	
 

 John,

 

 1st issue 1998, p 11 shows:

 * slot in the tank angle

 * plate nut in the fuselage angle

 * tank angle forward of the fuselage angle.

 

 If you'd like, I can scan the page and e-mail it directly to you.

 

 Steve

 RV-6A

    [quote][b]

n1cxo320(at)salidaco.com
Guest

Posted: Sun Mar 11, 2007 12:24 pm Post subject: RV6/6A Fuel Tank Attachment

No, thank you, Steve, the information you gave me  is exactly what I needed to know. I can take it from here.

  

 Again, thank you !!!

  

 John

   [quote][b]

recapen(at)earthlink.net
Guest

Posted: Sun Mar 11, 2007 2:56 pm Post subject: RV6/6A Fuel Tank Attachment

Tank one goes foreward.

  

 Tank one get s the slot.

  

 Fuse one gets the platenut.

  

 Just did my 6A.

  

 Don't have the appropriate RVator handy though -  but I can take pictures next weekend of my install!

  

 Zap me direct......if you want  'em.....

 Ralph

 [quote]   ---

n1cxo320(at)salidaco.com
Guest

Posted: Sun Mar 11, 2007 3:36 pm Post subject: RV6/6A Fuel Tank Attachment

DO NOT ARCHIVE

  

 Thanks, Ralph.

  

 John

   [quote][b]

stevea(at)svpal.org
Guest

Posted: Sun Mar 11, 2007 3:47 pm Post subject: RV6/6A Fuel Tank Attachment

John Fasching wrote:  	  Quote: 	
		              No, thank you, Steve, the information you gave me is exactly what I needed to know. I can take it from here.

    

   Again, thank you !!!

 	
 John,

 

 Just for the record, in case you don't have this, there are some details on the bolt/washer installation.  It is not a standard 1/4" bolt torque.

 

 >From the RVator:

 "Do not over tighten the bolt.  If there is too much clamping pressure the joint will note separate.  The correct torque is achieved by tightening the bolt until the AN970 washer can barely be moved with your fingers.  Then tighten the bolt 1/6 of a turn (one flat on the head).  The bolt has a drilled head and should be safety wired."

 

 Good luck with the tank slosh clean out.

 

 Steve

    [quote][b]

Gerald Richardson

Joined: 11 Jan 2006
Posts: 7
Location: Medicine Hat, Alberta

Posted: Sun Mar 11, 2007 7:21 pm Post subject: RV6/6A Fuel Tank Attachment

Steve:  

   

Wh en you get the page scanned, I would greatly appreciate a copy of it also.  

Please email me at gerric(at)shaw.ca (gerric(at)shaw.ca)  

   

Thank you for your time.  

   

Gerald Richardson  

RV-6A  

         

  

From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Steve Allison

 Sent: Sunday, March 11, 2007 12:42

 To: rv-list(at)matronics.com

 Subject: Re: RV6/6A Fuel Tank Attachment  

  

   

John Fasching wrote:     

In preparation for replacing my loose slosh fuel tanks I want to mount the inboard forward bracket attachment the way Van now recommends it. My earlier plans just had you bolt the angle from the fuselage to the angle from the fuel tank tip.  

    

   

    

How is the 'new' arrangement? Which angle bracket gets the 1/4-inch slot? The tank one or the fuselage one?  

    

Also which goes forward - the tank bracket or the fuselage bracket.? Which bracket gets the platenut?  

  



 John,

 

 1st issue 1998, p 11 shows:

 * slot in the tank angle

 * plate nut in the fuselage angle

 * tank angle forward of the fuselage angle.

 

 If you'd like, I can scan the page and e-mail it directly to you.

 

 Steve

 RV-6A   	  Quote: 	
		    Email Forum -http://www.matronics.com/Navigator?RV-List 	
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--

 03/11/2007 09:27

  

  

--

 03/11/2007 09:27

     [quote][b]

_________________
RV6A

wdleonard(at)gmail.com
Guest

Posted: Mon Mar 12, 2007 5:09 am Post subject: RV6/6A Fuel Tank Attachment

I am in the same boat as John (my wings are off for painting), but I can't remember the purpose of the platenut.

  

 Dave Leonard



 

 On 3/11/07, Gerald Richardson <gerric(at)shaw.ca (gerric(at)shaw.ca)> wrote: [quote]   

Steve: 

  

Wh en you get the page scanned, I would greatly appreciate a copy of it also. 

Please email me at  gerric(at)shaw.ca (gerric(at)shaw.ca) 

  

Thank you for your time. 

  

Gerald Richardson 

RV-6A 

  David Leonard



Turbo Rotary RV-6 N4VY

My websites at:

http://members.aol.com/_ht_a/rotaryroster/index.html

 http://members.aol.com/_ht_a/vp4skydoc/index.html

http://leonardiniraq.blogspot.com 

[b]

khorton01(at)rogers.com
Guest

Posted: Mon Mar 12, 2007 5:52 am Post subject: RV6/6A Fuel Tank Attachment

On 12 Mar 2007, at 09:08, David Leonard wrote:



 	  Quote: 	
		   I am in the same boat as John (my wings are off for painting), but  

 I can't remember the purpose of the platenut.




	


Pictue the angle on the nose of the inboard tank rib is bolted to the  

angle on the fuselage, with no slots in either angle.  Now, imagine a  

crash scenario where the wing leading edge hits something, and this  

pushes the wing back.  The nose of the tank rib is rigidly attached  

to the fuselage, so there is a risk of the rib being pulled out of  

the tank, releasing a large quantity of fuel, and leading to a fire.   

This apparently happened on more than one accident, and led to a  

design change.



The design change puts a slot in one of those angles.  If the bolt is  

not too tight, it will simply slide out the slot, and allow the wing  

to be pushed back without pulling the fuel tank apart.  This should  

hopefully reduce the chance of a fuel tank breach, and reduce the  

risk of a post-crash fire, which should improve survivability.



 From a functionality point of view, it doesn't matter which angle  

has the slot.  My recollection is that for retrofits to existing  

tanks, Van suggested to put the slot in the fuselage angle, as it can  

be unbolted to make the mod.  For new build tanks, Van suggested to  

put the slot on the tank angle, as this was perceived to have some  

advantage.



Kevin Horton         RV-8 (finishing kit)

Ottawa, Canada

http://www.kilohotel.com/rv8

wdleonard(at)gmail.com
Guest

Posted: Mon Mar 12, 2007 7:35 pm Post subject: RV6/6A Fuel Tank Attachment

Thanks Kevin, 

 I understand the purpose of the slot, though to be honest I am still hesitant to cut the slot.  What if it changes the flutter characteristics or allows some movement that wears over time etc...  (I know, lots of planes flying with that mod but it is a tough one to accept). 

  

 Anyway, my question is about the platenut.  Even though Steve sent me the copy of the plans from the original RVator, I still don't understand the placement and/or purpose of the platenut.  Is it a large platenut installed on the washer?  (the plans say "miniature platenut").  If so, why not use a regular nut?  Something about not letting the bolt get crooked when release is needed? 

  

 Dave Leonard



 

 On 3/12/07, Kevin Horton <khorton01(at)rogers.com (khorton01(at)rogers.com)> wrote: [quote]--> RV-List message posted by: Kevin Horton <khorton01(at)rogers.com  (khorton01(at)rogers.com)>



On 12 Mar 2007, at 09:08, David Leonard wrote:



 	  Quote: 	
		   I am in the same boat as John (my wings are off for painting), but

 I can't remember the purpose of the platenut.




	


Pictue the angle on the nose of the inboard tank rib is bolted to the 

angle on the fuselage, with no slots in either angle.  Now, imagine a

crash scenario where the wing leading edge hits something, and this

pushes the wing back.  The nose of the tank rib is rigidly attached

to the fuselage, so there is a risk of the rib being pulled out of 

the tank, releasing a large quantity of fuel, and leading to a fire.

This apparently happened on more than one accident, and led to a

design change.



The design change puts a slot in one of those angles.  If the bolt is 

not too tight, it will simply slide out the slot, and allow the wing

to be pushed back without pulling the fuel tank apart.  This should

hopefully reduce the chance of a fuel tank breach, and reduce the

risk of a post-crash fire, which should improve survivability. 



From a functionality point of view, it doesn't matter which angle

has the slot.  My recollection is that for retrofits to existing

tanks, Van suggested to put the slot in the fuselage angle, as it can

 be unbolted to make the mod.  For new build tanks, Van suggested to

put the slot on the tank angle, as this was perceived to have some

advantage.



Kevin Horton         RV-8 (finishing kit)

Ottawa, Canada

 



Turbo Rotary RV-6 N4VY

My websites at:

http://members.aol.com/_ht_a/rotaryroster/index.html

 http://members.aol.com/_ht_a/vp4skydoc/index.html

http://leonardiniraq.blogspot.com   [quote][b]

khorton01(at)rogers.com
Guest

Posted: Tue Mar 13, 2007 2:48 am Post subject: RV6/6A Fuel Tank Attachment

Ah, now I understand.  Yeah, it could be to keep the bolt square to  

the angle if release is ever needed.  If you just had a bolt, nut and  

two washers, I can imagine that the bolt could tip sideways a bit and  

bind, which would defeat the purpose of the mod.

The purpose of these pieces of angle appear to be to support the  

weight of the front of the fuel, especially when pulling some g.   

Adding the slot does not compromise that function.  I see no way this  

would affect flutter, nor would I expect much movement, and thus  

there should be very little, if any wear.  I don't see a downside,  

other than the time required to do the mod.

Kevin

On 12 Mar 2007, at 23:34, David Leonard wrote:

 	  Quote: 	
		   Thanks Kevin,

 I understand the purpose of the slot, though to be honest I am  

 still hesitant to cut the slot.  What if it changes the flutter  

 characteristics or allows some movement that wears over time  

 etc...  (I know, lots of planes flying with that mod but it is a  

 tough one to accept).

 Anyway, my question is about the platenut.  Even though Steve sent  

 me the copy of the plans from the original RVator, I still don't  

 understand the placement and/or purpose of the platenut.  Is it a  

 large platenut installed on the washer?  (the plans say "miniature  

 platenut").  If so, why not use a regular nut?  Something about not  

 letting the bolt get crooked when release is needed?

 Dave Leonard

 On 3/12/07, Kevin Horton <khorton01(at)rogers.com> wrote: --> RV-List  

 message posted by: Kevin Horton <khorton01(at)rogers.com >

 On 12 Mar 2007, at 09:08, David Leonard wrote:

 > I am in the same boat as John (my wings are off for painting), but

 > I can't remember the purpose of the platenut.

 >

 Pictue the angle on the nose of the inboard tank rib is bolted to the

 angle on the fuselage, with no slots in either angle.  Now, imagine a

 crash scenario where the wing leading edge hits something, and this

 pushes the wing back.  The nose of the tank rib is rigidly attached

 to the fuselage, so there is a risk of the rib being pulled out of

 the tank, releasing a large quantity of fuel, and leading to a fire.

 This apparently happened on more than one accident, and led to a

 design change.

 The design change puts a slot in one of those angles.  If the bolt is

 not too tight, it will simply slide out the slot, and allow the wing

 to be pushed back without pulling the fuel tank apart.  This should

 hopefully reduce the chance of a fuel tank breach, and reduce the

 risk of a post-crash fire, which should improve survivability.

 From a functionality point of view, it doesn't matter which angle

 has the slot.  My recollection is that for retrofits to existing

 tanks, Van suggested to put the slot in the fuselage angle, as it can

 be unbolted to make the mod.  For new build tanks, Van suggested to

 put the slot on the tank angle, as this was perceived to have some

 advantage.

 Kevin Horton         RV-8 (finishing kit)

 Ottawa, Canada

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