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steven.pitt2(at)ntlworld.
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 Posted: Mon Jul 27, 2015 5:56 am Post subject: vent pipes |
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I am looking to increase the size of my fuel vent pipes for my trigear. What
sizes have others used. The Europa supplied pipes are 6.5mm id x 10mm od.
Thanks
Steve Pitt
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grahamsingleton(at)btinte
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| Posted: Mon Jul 27, 2015 9:10 am Post subject: vent pipes |
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Steve
I would suggest using 3/8 aluminium from tank to the top of the cobra, then 1/4" to the outside air. That way
any splashing goes back into the tank. I used -6 AN fittings
Graham
On Monday, 27 July 2015, 14:57, Steven Pitt <steven.pitt2(at)ntlworld.com> wrote:
--> Europa-List message posted by: "Steven Pitt" <steven.pitt2(at)ntlworld.com (steven.pitt2(at)ntlworld.com)>
I am looking to increase the size of my fuel vent pipes for my trigear. What
sizes have others used. The Europa supplied pipetp://www.matronics.com/Navigator?Europa-List" target="_blank">http://www.bsp; -Matt Dralle, List Admin.
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steven.pitt2(at)ntlworld.
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| Posted: Mon Jul 27, 2015 2:46 pm Post subject: vent pipes |
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Thanks as ever Graham. Did you make up any of your vent pipe bosses/fittings that I have seen in photos some while ago?
Steve
[quote] ---
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Rick Moss
Joined: 21 Sep 2014
Posts: 96
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| Posted: Tue Jul 28, 2015 11:47 pm Post subject: Re: vent pipes |
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That sounds interesting Graham;
My vent comes out of the tank, run horizontally to the bulkhead behind the baggage bay, then loops upwards over the top of the fuselage and down the other side to vent through the underside. When filling, if I get the fuel level too close to the filler cap, it starts a syphon through the vent that is hard to stop until it's dumped a couple of litres of fuel. I've been trying to think of a way to break the syphon.
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ptag.dev(at)tiscali.co.uk
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| Posted: Wed Jul 29, 2015 12:03 am Post subject: vent pipes |
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Hi! Rick,
Mine follows the same route as yours but I have a bottle slightly down from
centre on the starboard side so over fill will be piped back to tank, then
out the back of the bottle near the roof centre another pipe runs down to
exit the port flap hinge slot. That will break your siphon.
Regards
Bob Harrison G-PTAG
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Rick Moss
Joined: 21 Sep 2014
Posts: 96
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| Posted: Wed Jul 29, 2015 12:11 am Post subject: Re: vent pipes |
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I see what you mean Bob, thanks. Presumably simply T'ing the breather soon after it exits (enters?) the tank and routing the branch to the top of the cobra would achieve the same, at least whilst the filler cap is removed?
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bill.sue(at)orcon.net.nz
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| Posted: Wed Jul 29, 2015 1:16 am Post subject: vent pipes |
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My vent runs from the tank to the top of the filler pipe just below the
cap level. A second pipe runs from the top of the filler pipe and down
to the bottom of the fuselage with a flush static vent.
Cannot syphon as the line is effectively broken in the top of the filler
pipe and will not leak fuel inverted if there is no damage.
1200hrs no issues.
Sue and Bill Sisley
ZK CHV
On 29/07/2015 8:02 p.m., Bob Harrison wrote:
[quote]
Hi! Rick,
Mine follows the same route as yours but I have a bottle slightly down from
centre on the starboard side so over fill will be piped back to tank, then
out the back of the bottle near the roof centre another pipe runs down to
exit the port flap hinge slot. That will break your siphon.
Regards
Bob Harrison G-PTAG
--
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budyerly(at)msn.com
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| Posted: Wed Jul 29, 2015 4:43 am Post subject: vent pipes |
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Steve,
As you have seen on my website, I run a vent line from the tank to the top of the Cobra neck area about 2 inches down from the filler neck (that allows expansion or overfilling to clear out of the Cobra). On the other side of the neck I run a 1/4 inch line to the vent in the gear truss well. I believe you are having issues with filling the tank and the slow fill rate of the Cobra neck. Most of the tank venting will take the path of least resistance which is vent out of the fuel cap when filling and will occasionally (always) result in a lovely cool fuel shower.
Provided your 2 inch boss attaching the rubber hose to the Cobra has been properly reamed out to allow a full flow. (Some do not trim this inner molding out to increase the area, which is stronger for those who over tighten clamps, but reduces the tank inlet diameter.):
Two things will help prevent a blow back of fuel.
First, A 3/8” max line (I use 5/16”) does help vent the air out quickly. The problem is where is your vent line run? If it runs to the Cobra first, you must make sure as you are filling, the vent line remains clear. Not so easy to do. If the vent is to the top or bottom of the aircraft direct from the tank, it would be prudent to run 3/8 inch until fairly close to the vent then to the 1/4 inch vent. Choose your fittings carefully as a 3/8 by 1/8 NPT fitting may only have a 1/4 inch ID on some brass fittings. Choose wisely.
Second. A short (12”) piece of 1 inch ID polyurethane clear tubing is what I use to attach to the fuel nozzle from the fuel truck. I place the polyurethane tube on the trucks nozzle and insert the flexible tube into the Cobra. This does two things. 1. It is a visual indication of the fuel burping back into the hose allowing me to stop or reduce flow. I never fuel at a rate that completely fills the clear tube. When near completely full, the tube fills and holds the fuel after I stop the nozzle, if the 12 inch line stays full, I retract it slowly and the remaining fuel in the line tops me to my vent line. Second, it keeps my tank to Cobra (and sight gauge vent line) clear of the incoming fuel. No burps unless I go full throttle at 100 GPM that the truck delivers, then it is fuel bath time.
Jim Brown is to credit for this, he used a 24 inch tube which he would force down into the Cobra quite far on his mono. He showed me that by first squirting some fuel in the Cobra to pre lube it, the tube slid in quite easily and gratifying. He could fill at a much higher rate and rarely had a burp back. The longer line also allowed him to hold the nozzle at chest height for more comfortable fuelling. I just like the 12 inch long one as it fits in the headrest easily.
Try the inexpensive 1 inch flexible polyurethane (or similar in the UK) and a bit of patience and it works for me and the line boys quite well on our blind filling of the Europa Tank...
Best Regards,
Bud Yerly
Best Regards,
Bud Yerly
From: Steven Pitt (steven.pitt2(at)ntlworld.com)
Sent: Monday, July 27, 2015 6:45 PM
To: europa-list(at)matronics.com (europa-list(at)matronics.com)
Subject: Re: vent pipes
Thanks as ever Graham. Did you make up any of your vent pipe bosses/fittings that I have seen in photos some while ago?
Steve
[quote] ---
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Rick Moss
Joined: 21 Sep 2014
Posts: 96
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