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wing conduit mod

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rowil(at)clara.net
Guest

Posted: Sat Sep 23, 2006 1:45 pm Post subject: wing conduit mod

I just checked the PFA website for the list of "standard" mods, and 

don't see anything there about wing conduits.



I think I'd like to install conduit before I close the wing, not just 

for the possibility of wingtip lights or strobes, but also because 

the conduit can provide a very handy hole to insert a support when 

turning the wing over.



Does anyone know if there is a "standard" mod in the pipeline? Or 

indeed has anyone in UK got wing conduits as an approved mod? Or is 

it a "non-mod"?



regards



Rowland

(actually thinking about aeroplane-building again!)

-- 

| Rowland Carson  PFA #16532    http://home.clara.net/rowil/aviation/

| 750 hours building Europa #435 G-ROWI  e-mail <rowil(at)clara.net>

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fklein(at)orcasonline.com
Guest

Posted: Sat Sep 23, 2006 2:45 pm Post subject: wing conduit mod

Rowland,



w/o regard to PFA issues, I used some feather-light plastic irrigation 

pipe from a garden shop. My hunch is that it would not be robust enough 

to serve as a wing rotator support and that function, if desired would 

be best dealt w/ separately. I'm unaware of any "standard" mod.



Fred

A194



On Saturday, September 23, 2006, at 01:31 PM, Rowland Carson wrote:



 	  Quote: 	
		   



 I just checked the PFA website for the list of "standard" mods, and 

 don't see anything there about wing conduits.



 I think I'd like to install conduit before I close the wing, not just 

 for the possibility of wingtip lights or strobes, but also because the 

 conduit can provide a very handy hole to insert a support when turning 

 the wing over.



 Does anyone know if there is a "standard" mod in the pipeline? Or 

 indeed has anyone in UK got wing conduits as an approved mod? Or is it 

 a "non-mod"?



 regards



 Rowland

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steven.pitt2(at)ntlworld.
Guest

Posted: Sat Sep 23, 2006 10:34 pm Post subject: wing conduit mod

Rowland, I believe Ian Rickard has details of a conduit fitting which we

have used in our aircraft to our inspectors satisfaction.

Regrds

Steve Pitt

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g-iani(at)ntlworld.com
Guest

Posted: Sun Sep 24, 2006 1:29 am Post subject: wing conduit mod

Rowland



"I just checked the PFA website for the list of "standard" mods, and

don't see anything there about wing conduits."



You are right.  Jeremy Davy has a mod (10713) which I started to convert

into a standard mod last year.  As the eelier standard mods had

disappeared into a "Francis hole" ( This is a black hole that does not

have an event horizon for the physics buffs) I stopped work on it.



At the meeting I had with Francis on 29 March 2006 it was agreed

(Rowland you have had a copy of the minutes of this meeting) that there

was no need for a standard mod for this as Francis is satisfied that it

is cover by "standard aircraft practice" (otherwise know as a "non

mod").  So carry no, just carry on as long as your inspector is happy.



"I think I'd like to install conduit before I close the wing, not just

for the possibility of wingtip lights or strobes"



Yes and also remember that you will need the conduit if your pitot and

static pipes become brittle and need replacing.



"also because the conduit can provide a very handy hole to insert a

support when turning the wing over"



Well not so much the conduit but a hole in the wing tip.  I have a

reinforced hole her which is finally used as the nav light mount but it

was very handy (with a piece of curtain pole that happened to be the

correct diameter inserted) for handling and rotating the wing during

finishing and spraying.



If you want to see what others have done I can send you some pictures

off list.

Ian Rickard  #505 G-IANI XS Trigear

Europa Club Mods Rep (Trigear)

e-mail mods(at)europaclub.org.uk   

   or direct g-iani(at)ntlworld.com

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M.Grass(at)comcast.net
Guest

Posted: Sun Sep 24, 2006 8:44 am Post subject: wing conduit mod

To our friends on the east side of the pond.



What is the typical opinion of the PFA inspectors on the wing conduit and 

pitot/static/stall warner lines. Do you have to reinforce where holes are 

made in the ribs? I question this because I believe (and not know) that the 

middle portion of the rib is only caring negligible loads. This is where our 

friends in the flying aluminum cans cut there holes to make the structure 

more lightweight. My intension is to run 2 1/4 inch aluminum lines for pitot 

etc and an about 1/2 inch conduit for electrical supply.



Best regards



Michael Grass

A266 Trigear / 914/ Woodcomp VP

Detroit, Mi

---

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NevEyre(at)aol.com
Guest

Posted: Sun Sep 24, 2006 9:38 am Post subject: wing conduit mod

Hi,

 The solution worked out by Andy Draper / Barry Mellors was a 2 ply Bid  ''donut ring'' around the hole on each rib, [ one side only ], Make the diameter  2'' bigger than the hole.

 Get the orientation of each ply 45 degrees apart.

 Easy way is wet the two plies on plastic, cut out the discs,stick it on the  smooth side of the rib [ scuff it first ? ! ], when it has cured, drill the  hole. 

 Main objective was to prevent the rib from '' tearing''.

 Start at the root rib half way between the spar and drag pin, at half chord  position, as you work outboard, get lower in the ribs, so the conduit will pass  under the aileron pushrod, then sweep it forward as it goes thru' the last rib,  and Bid the conduit to the end of the spar.

 Where it passes thru the double rib, it will be close to the lower skin,  the ''donut'' will lap onto the skin itself.

 The last two bays are far enough apart that it helps to support the conduit  with a piece of foam, and put a Bid lay up over it ,onto the skin, half way  along.

 Scuff and flox the conduit at each rib, I tend to put a Bid tape on the  inside of the root rib, to keep it in place.

 Cheers,

 Nev. 

  [quote][b]

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fklein(at)orcasonline.com
Guest

Posted: Sun Sep 24, 2006 11:35 am Post subject: wing conduit mod

Michael,



The alum. acft. ribs w/ which I am familiar have flanged lightening 

holes...the pre-formed flange functioning as a web stiffener. You are 

of course correct w/ regard to loads being "negligible" in this area.



Fred

A194



On Sunday, September 24, 2006, at 09:37 AM, Michael Grass wrote:



 	  Quote: 	
		   

 <M.Grass(at)comcast.net>



  I question this because I believe (and not know) that the middle 

 portion of the rib is only caring negligible loads. This is where our 

 friends in the flying aluminum cans cut there holes to make the 

 structure more lightweight.

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