 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
dan(at)syz.com
Guest
|
 Posted: Tue Nov 21, 2017 7:50 pm Post subject: Ice prevention on fuel vent |
 |
|
Hi everyone.
I'm about to do my first annual on the RV-10 and during the past year of flying, I've come up with a few slight changes/improvements I'm thinking of doing while I'm at it.
One thing I'm wondering about is the potential for icing on the fuel air vent. Not that I have any intention whatsoever of ever coming close to known icing conditions, but it's those unexpected conditions that sometimes get you. Van's suggests (and I implemented) the alternate air door in the air box for that reason. But in looking closely at the two fuel vents, it seems that they would be very prone to ice buildup if ever in conditions conducive to it.. and especially since the vent 45 cut is angled forwards into the airstream. It seems to me that if those vents were to plug with even a small amount of ice, the clock would start ticking down quickly to fuel starvation. And I could see ice building plugging up those vents far before it would the air filter.
I've heard/read of a few things people have done to their fuel vents to mitigate this - a check valve in the wing root that opens if a bit of suction appears in the vent, a small "bypass hole" drilled in the vent line on the trailing edge of the line or possibly in the wing root, or a little "shroud" in front of the vent line externally to have ice build up on that instead of the vent. I'm here to see if anyone has opinions on what might be the best way to deal with this (or if I'm worrying about nothing).
I do have to wonder exactly why the vent is external to the wing root in the first place - if it were in the wing root, it would be mostly protected from ice buildup, and surely enough air would get into the root area through the various cracks around the fairings. Though I suspect that the positive pressure it sees external to the wing oriented as it is does help with fuel flow..
Suggestions?
Dan
---
Dan Charrois
President, Syzygy Research & Technology
Phone: 780-961-2213
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
|
|
|
| Back to top |
|
 |
Bob Turner
Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA
|
| Posted: Tue Nov 21, 2017 8:47 pm Post subject: Re: Ice prevention on fuel vent |
|
|
If you put the vent in the wing root, then after you top off the tank and park in the sun, the gas will expand - and pour gas into the wing root, if that’s where the vent is.
I used Tim Olsen’s method - check valve to aux vent in the wing root, only opens if there’s negative pressure.
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
|
_________________
Bob Turner
RV-10 QB |
|
| Back to top |
|
|
rvdave
Joined: 24 Jan 2009
Posts: 191
|
| Posted: Thu Nov 23, 2017 1:57 am Post subject: Re: Ice prevention on fuel vent |
|
|
I’ve been looking for a check valve where can you get one with low psi?
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
|
_________________
Dave Ford
Cadillac, MI |
|
| Back to top |
|
|
philperry9
Joined: 23 Nov 2011
Posts: 381
|
| Posted: Thu Nov 23, 2017 5:27 am Post subject: Ice prevention on fuel vent |
|
|
Here you go Dave..
http://m.aircraftspruce.com/catalog/appages/acscheckvalve.php?clickkey=6903
Sent from my iPhone
On Nov 23, 2017, at 3:57 AM, rvdave <rv610dave(at)gmail.com (rv610dave(at)gmail.com)> wrote:
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
|
|
|
| Back to top |
|
|
trigo(at)mail.telepac.pt
Guest
|
| Posted: Thu Nov 23, 2017 6:26 am Post subject: Ice prevention on fuel vent |
|
|
And where and how is this installed in the fuel vent?
Carlos
Enviado do meu iPhone
No dia 23/11/2017, às 13:20, Phillip Perry <philperry9(at)gmail.com (philperry9(at)gmail.com)> escreveu:
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
|
|
|
| Back to top |
|
|
rvdave
Joined: 24 Jan 2009
Posts: 191
|
| Posted: Thu Nov 23, 2017 6:44 am Post subject: Re: Ice prevention on fuel vent |
|
|
That was too easy Phil, looks just right.
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
|
_________________
Dave Ford
Cadillac, MI |
|
| Back to top |
|
|
rj_todd(at)yahoo.co.uk
Guest
|
| Posted: Thu Nov 23, 2017 7:29 am Post subject: Ice prevention on fuel vent |
|
|
I'm surprised that Tim O hasn't jumped in yet but he describes how to add a one way valve into the ventilation system; he used a valve from McMaster-Carr.
Fuel Vent Ice Protection
Best wishes to all,
Rodger
in NW Oz where icing will never be a problem!
Fuel Vent Ice Protection
On Thursday, 23 November 2017, 22:42, Carlos Trigo <trigo(at)mail.telepac.pt> wrote:
And where and how is this installed in the fuel vent?
Carlos
Enviado do meu iPhone
No dia 23/11/2017, às 13:20, Phillip Perry <philperry9(at)gmail.com (philperry9(at)gmail.com)> escreveu:
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
|
|
|
| Back to top |
|
|
trigo(at)mail.telepac.pt
Guest
|
| Posted: Thu Nov 23, 2017 7:54 am Post subject: Ice prevention on fuel vent |
|
|
Thank you Rodgerand Tim
Now to order the hardware...
Thanks
Carlos
Enviado do meu iPhone
No dia 23/11/2017, às 15:27, Rodger Todd <rj_todd(at)yahoo.co.uk (rj_todd(at)yahoo.co.uk)> escreveu:
| Quote: | 96<![endif]-->I'm surprised that Tim O hasn't jumped in yet but he describes how to add a one way valve into the ventilation system; he used a valve from McMaster-Carr.
Fuel Vent Ice Protection
Best wishes to all,
Rodger
in NW Oz where icing will never be a problem!
Fuel Vent Ice Protection
On Thursday, 23 November 2017, 22:42, Carlos Trigo <trigo(at)mail.telepac.pt (trigo(at)mail.telepac.pt)> wrote:
And where and how is this installed in the fuel vent?
Carlos
Enviado do meu iPhone
No dia 23/11/2017, às 13:20, Phillip Perry <philperry9(at)gmail.com (philperry9(at)gmail.com)> escreveu:
|
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
|
|
|
| Back to top |
|
|
philperry9
Joined: 23 Nov 2011
Posts: 381
|
| Posted: Thu Nov 23, 2017 7:56 am Post subject: Ice prevention on fuel vent |
|
|
Carlos,
It's installed by putting a "T" fitting where there vent exits the tank. One leg goes down as usual and pokes out the bottom fairing. The other leg goes to the check valve and never exits the wing root.
The orientation of the valve has to be such that air can pass through the valve in the direction of the tank (obviously).
The idea is that when the primary vent unknowingly becomes blocked (ice, bugs, etc), the check valve will open and allow venting from the wing root. As the fuel pump sucks the fuel out of the tank, the pressure drops inside the tank, and that is what opens the vent without any intervention on your part.
On Thu, Nov 23, 2017 at 8:23 AM, Carlos Trigo <trigo(at)mail.telepac.pt (trigo(at)mail.telepac.pt)> wrote:
| Quote: | And where and how is this installed in the fuel vent?
Carlos
Enviado do meu iPhone
No dia 23/11/2017, às 13:20, Phillip Perry <philperry9(at)gmail.com (philperry9(at)gmail.com)> escreveu:
|
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
|
|
|
| Back to top |
|
|
trigo(at)mail.telepac.pt
Guest
|
| Posted: Thu Nov 23, 2017 8:29 am Post subject: Ice prevention on fuel vent |
|
|
Thank you Philip
CT
De: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] Em nome de Phillip Perry
Enviada: Thursday, November 23, 2017 3:52 PM
Para: rv10-list(at)matronics.com
Assunto: Re: Re: Ice prevention on fuel vent
Carlos,
It's installed by putting a "T" fitting where there vent exits the tank. One leg goes down as usual and pokes out the bottom fairing. The other leg goes to the check valve and never exits the wing root.
The orientation of the valve has to be such that air can pass through the valve in the direction of the tank (obviously).
The idea is that when the primary vent unknowingly becomes blocked (ice, bugs, etc), the check valve will open and allow venting from the wing root. As the fuel pump sucks the fuel out of the tank, the pressure drops inside the tank, and that is what opens the vent without any intervention on your part.
On Thu, Nov 23, 2017 at 8:23 AM, Carlos Trigo <trigo(at)mail.telepac.pt (trigo(at)mail.telepac.pt)> wrote: | Quote: |
And where and how is this installed in the fuel vent?
Carlos
Enviado do meu iPhone
No dia 23/11/2017, às 13:20, Phillip Perry <philperry9(at)gmail.com (philperry9(at)gmail.com)> escreveu:
|
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
|
|
|
| Back to top |
|
|
rj_todd(at)yahoo.co.uk
Guest
|
| Posted: Thu Nov 23, 2017 8:33 am Post subject: Ice prevention on fuel vent |
|
|
My pleasure
On Friday, 24 November 2017, 0:28, Carlos Trigo <trigo(at)mail.telepac.pt> wrote:
Thank you Rodgerand Tim
Now to order the hardware...
Thanks
Carlos
Enviado do meu iPhone
No dia 23/11/2017, às 15:27, Rodger Todd <rj_todd(at)yahoo.co.uk (rj_todd(at)yahoo.co.uk)> escreveu:
| Quote: | 96<![endif]-->I'm surprised that Tim O hasn't jumped in yet but he describes how to add a one way valve into the ventilation system; he used a valve from McMaster-Carr.
Fuel Vent Ice Protection
Best wishes to all,
Rodger
in NW Oz where icing will never be a problem!
Fuel Vent Ice Protection
On Thursday, 23 November 2017, 22:42, Carlos Trigo <trigo(at)mail.telepac.pt (trigo(at)mail.telepac.pt)> wrote:
And where and how is this installed in the fuel vent?
Carlos
Enviado do meu iPhone
No dia 23/11/2017, às 13:20, Phillip Perry <philperry9(at)gmail.com (philperry9(at)gmail.com)> escreveu:
|
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
|
|
|
| Back to top |
|
|
Tim Olson
Joined: 25 Jan 2007
Posts: 2878
|
| Posted: Thu Nov 23, 2017 9:14 pm Post subject: Ice prevention on fuel vent |
|
|
Regarding that check valve...I just got around to looking at the link on this
Aircraft Spruce one, Phil.
I know you want one with a very very very low operating pressure (vacuum, actually).
If you get even a couple of psi that it takes to open the valve, your tank will
have probably imploded by then. This valve appears to be for fuel flow
return lines. It doesn't seem to give a spec.
I got a valve from McMaster Carr that had a cracking pressure of .3 psi.
http://www.myrv10.com/N104CD/upgrades/20090525/index.html
I can't say that the valve you linked to is bad, but I would just caution to
make sure that it's probably no more than 1psi of cracking pressure.
Any valve that takes more than that to operate may risk tank
collapse.
Tim
On 11/23/2017 7:20 AM, Phillip Perry wrote:
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
|
|
|
| Back to top |
|
|
jesse(at)saintaviation.co
Guest
|
| Posted: Thu Nov 23, 2017 9:32 pm Post subject: Ice prevention on fuel vent |
|
|
Is there any reason you can just use a free flow check valve? If the vent iced over it freely sucks air through the check valve. If the fuel expands and starts coming out the vent, there would not be ice there to start with because of the temperature.
Jesse SaintSaint Aviation, Inc.
jesse(at)saintaviation.com (jesse(at)saintaviation.com)
C: 352-427-0285
F: 815-377-3694
Sent from my iPhone
On Nov 24, 2017, at 12:12 AM, Tim Olson <Tim(at)MyRV10.com (Tim(at)MyRV10.com)> wrote:
| Quote: | Regarding that check valve...I just got around to looking at the link on this
Aircraft Spruce one, Phil.
I know you want one with a very very very low operating pressure (vacuum, actually).
If you get even a couple of psi that it takes to open the valve, your tank will
have probably imploded by then. This valve appears to be for fuel flow
return lines. It doesn't seem to give a spec.
I got a valve from McMaster Carr that had a cracking pressure of .3 psi.
http://www.myrv10.com/N104CD/upgrades/20090525/index.html
I can't say that the valve you linked to is bad, but I would just caution to
make sure that it's probably no more than 1psi of cracking pressure.
Any valve that takes more than that to operate may risk tank
collapse.
Tim
On 11/23/2017 7:20 AM, Phillip Perry wrote:
|
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
|
|
|
| Back to top |
|
|
trigo(at)mail.telepac.pt
Guest
|
| Posted: Fri Nov 24, 2017 1:56 am Post subject: Ice prevention on fuel vent |
|
|
Tim
In the Q+A for this ACS valve, at the Aircraft Spruce website, it says that this valve breakout pressure is 0 psi.
Will this work for this application?
Carlos
Enviado do meu iPhone
No dia 24/11/2017, às 05:12, Tim Olson <Tim(at)MyRV10.com (Tim(at)MyRV10.com)> escreveu:
| Quote: | Regarding that check valve...I just got around to looking at the link on this
Aircraft Spruce one, Phil.
I know you want one with a very very very low operating pressure (vacuum, actually).
If you get even a couple of psi that it takes to open the valve, your tank will
have probably imploded by then. This valve appears to be for fuel flow
return lines. It doesn't seem to give a spec.
I got a valve from McMaster Carr that had a cracking pressure of .3 psi.
http://www.myrv10.com/N104CD/upgrades/20090525/index.html
I can't say that the valve you linked to is bad, but I would just caution to
make sure that it's probably no more than 1psi of cracking pressure.
Any valve that takes more than that to operate may risk tank
collapse.
Tim
On 11/23/2017 7:20 AM, Phillip Perry wrote:
|
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
|
|
|
| Back to top |
|
|
Tim Olson
Joined: 25 Jan 2007
Posts: 2878
|
| Posted: Fri Nov 24, 2017 5:01 am Post subject: Ice prevention on fuel vent |
|
|
If it says 0 psi I would say that is excellent and should be great.
Tim
On Nov 24, 2017, at 3:53 AM, Carlos Trigo <trigo(at)mail.telepac.pt (trigo(at)mail.telepac.pt)> wrote:
| Quote: | Tim
In the Q+A for this ACS valve, at the Aircraft Spruce website, it says that this valve breakout pressure is 0 psi.
Will this work for this application?
Carlos
Enviado do meu iPhone
No dia 24/11/2017, às 05:12, Tim Olson <Tim(at)MyRV10.com (Tim(at)MyRV10.com)> escreveu:
| Quote: | Regarding that check valve...I just got around to looking at the link on this
Aircraft Spruce one, Phil.
I know you want one with a very very very low operating pressure (vacuum, actually).
If you get even a couple of psi that it takes to open the valve, your tank will
have probably imploded by then. This valve appears to be for fuel flow
return lines. It doesn't seem to give a spec.
I got a valve from McMaster Carr that had a cracking pressure of .3 psi.
http://www.myrv10.com/N104CD/upgrades/20090525/index.html
I can't say that the valve you linked to is bad, but I would just caution to
make sure that it's probably no more than 1psi of cracking pressure.
Any valve that takes more than that to operate may risk tank
collapse.
Tim
On 11/23/2017 7:20 AM, Phillip Perry wrote:
|
|
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
|
|
|
| Back to top |
|
|
Tim Olson
Joined: 25 Jan 2007
Posts: 2878
|
| Posted: Fri Nov 24, 2017 5:08 am Post subject: Ice prevention on fuel vent |
|
|
I should have read again before replying... darn.
That check valve will work fine, as would any free flow valve, but, the other down side is your fuel vents are 1/4” tubing and that particular valve uses 3/8” fittings, so you will need to buy additional adapters to fit it in, which may require a little more creativity in mounting. At $27.50 it isn’t super cheap either but looks like good quality. I don’t remember what I paid, but it would be worth checking out what other valves you can find because if you can find one that is 1/8” NPT it may be easier to adapt. That said, mine is brass and is probably heavier than this one is too.
Tim
On Nov 24, 2017, at 3:53 AM, Carlos Trigo <trigo(at)mail.telepac.pt (trigo(at)mail.telepac.pt)> wrote:
| Quote: | Tim
In the Q+A for this ACS valve, at the Aircraft Spruce website, it says that this valve breakout pressure is 0 psi.
Will this work for this application?
Carlos
Enviado do meu iPhone
No dia 24/11/2017, às 05:12, Tim Olson <Tim(at)MyRV10.com (Tim(at)MyRV10.com)> escreveu:
| Quote: | Regarding that check valve...I just got around to looking at the link on this
Aircraft Spruce one, Phil.
I know you want one with a very very very low operating pressure (vacuum, actually).
If you get even a couple of psi that it takes to open the valve, your tank will
have probably imploded by then. This valve appears to be for fuel flow
return lines. It doesn't seem to give a spec.
I got a valve from McMaster Carr that had a cracking pressure of .3 psi.
http://www.myrv10.com/N104CD/upgrades/20090525/index.html
I can't say that the valve you linked to is bad, but I would just caution to
make sure that it's probably no more than 1psi of cracking pressure.
Any valve that takes more than that to operate may risk tank
collapse.
Tim
On 11/23/2017 7:20 AM, Phillip Perry wrote:
|
|
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
|
|
|
| Back to top |
|
|
philperry9
Joined: 23 Nov 2011
Posts: 381
|
| Posted: Fri Nov 24, 2017 6:13 am Post subject: Ice prevention on fuel vent |
|
|
Yes. 0 psi on the valve to break it out.
I have a pair sitting in a box that I haven’t installed yet and can play with them to see how they behave. But 0 psi is what they claim for breakout and 20 psi max pressure.
It also mentions that the valve can be installed in any orientation.
[img]cid:A7C7F840-FF62-408C-A15B-0B245CE6B01B[/img]
Sent from my iPhone
On Nov 24, 2017, at 3:53 AM, Carlos Trigo <trigo(at)mail.telepac.pt (trigo(at)mail.telepac.pt)> wrote:
| Quote: | Tim
In the Q+A for this ACS valve, at the Aircraft Spruce website, it says that this valve breakout pressure is 0 psi.
Will this work for this application?
Carlos
Enviado do meu iPhone
No dia 24/11/2017, às 05:12, Tim Olson <Tim(at)MyRV10.com (Tim(at)MyRV10.com)> escreveu:
| Quote: | Regarding that check valve...I just got around to looking at the link on this
Aircraft Spruce one, Phil.
I know you want one with a very very very low operating pressure (vacuum, actually).
If you get even a couple of psi that it takes to open the valve, your tank will
have probably imploded by then. This valve appears to be for fuel flow
return lines. It doesn't seem to give a spec.
I got a valve from McMaster Carr that had a cracking pressure of .3 psi.
http://www.myrv10.com/N104CD/upgrades/20090525/index.html
I can't say that the valve you linked to is bad, but I would just caution to
make sure that it's probably no more than 1psi of cracking pressure.
Any valve that takes more than that to operate may risk tank
collapse.
Tim
On 11/23/2017 7:20 AM, Phillip Perry wrote:
|
|
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
|
| Description: |
|
| Filesize: |
91.55 KB |
| Viewed: |
16231 Time(s) |
|
|
|
| Back to top |
|
|
jbaer(at)LititzPP.com
Guest
|
| Posted: Fri Nov 24, 2017 6:38 am Post subject: Ice prevention on fuel vent |
|
|
Keep in mind that a 1 PSI pressure (or vacuum) over a 12” X 12” surface area produces 144 pounds of force. Would you stand on your tank? Be careful which check valve you use.
J
John Baer
Lititz Precision Products LLC
Lititz PA USA
www.LititzPP.com
Cell (EST USA) (717) 413-7931
Skype: John.Baer7712
From: <owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com)> on behalf of Tim Olson <Tim(at)MyRV10.com (Tim(at)MyRV10.com)>
Reply-To: <rv10-list(at)matronics.com (rv10-list(at)matronics.com)>
Date: Friday, November 24, 2017 at 7:56 AM
To: <rv10-list(at)matronics.com (rv10-list(at)matronics.com)>
Subject: Re: Re: Ice prevention on fuel vent
If it says 0 psi I would say that is excellent and should be great.
Tim
On Nov 24, 2017, at 3:53 AM, Carlos Trigo <trigo(at)mail.telepac.pt (trigo(at)mail.telepac.pt)> wrote:
| Quote: | Tim
In the Q+A for this ACS valve, at the Aircraft Spruce website, it says that this valve breakout pressure is 0 psi.
Will this work for this application?
Carlos
Enviado do meu iPhone
No dia 24/11/2017, às 05:12, Tim Olson <Tim(at)MyRV10.com (Tim(at)MyRV10.com)> escreveu:
| Quote: | Regarding that check valve...I just got around to looking at the link on this
Aircraft Spruce one, Phil.
I know you want one with a very very very low operating pressure (vacuum, actually).
If you get even a couple of psi that it takes to open the valve, your tank will
have probably imploded by then. This valve appears to be for fuel flow
return lines. It doesn't seem to give a spec.
I got a valve from McMaster Carr that had a cracking pressure of .3 psi.
http://www.myrv10.com/N104CD/upgrades/20090525/index.html
I can't say that the valve you linked to is bad, but I would just caution to
make sure that it's probably no more than 1psi of cracking pressure.
Any valve that takes more than that to operate may risk tank
collapse.
Tim
On 11/23/2017 7:20 AM, Phillip Perry wrote:
|
|
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
|
|
|
| Back to top |
|
|
rene(at)felker.com
Guest
|
| Posted: Fri Nov 24, 2017 7:45 am Post subject: Ice prevention on fuel vent |
|
|
- I went with the micro hole in the tube. Yes, loose a little positive pressure, maybe, but KISS applies.
- I do not know how to calculate the pressure left in the tank during fuel burn with a clogged tube, but I know it is based on total air volume and a perfect seal with the gas cap. So how long would it take to get to .5 or .3 PSI? If someone knows and likes doing that type of thing it would be interesting to calculate and build a graph. Is pressure (vacuum) directly proportional to volume? E.g. as the fuel is pump the air fills in the volume. So the last gallon has a lesser affect than the first gallon. It could be interesting to see. Also, how big would the check valve or micro hole really need to be. When would the mechanical fuel pump begin having problems pulling the fuel out of the tank……etc all questions that come to mind.
I went KISS. And after 10 years (almost) of flying my -10 I have learned that a little bit of completely has a long term cost. I mod my airplane every year it seems and I like doing it…..but I hate HAVING to do maintenance before the next flight.
(KISS, Keep It Simple Stupid)
Now, back to work so I can take tomorrow off and fix my Navworx problem. Thank you to all the guys who did the work on the AMOCs. Ralph Capen and Bob Leffler in particular in my case.
Rene'
801-721-6080
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of John Baer
Sent: Friday, November 24, 2017 7:36 AM
To: rv10-list(at)matronics.com
Subject: Re: Re: Ice prevention on fuel vent
Keep in mind that a 1 PSI pressure (or vacuum) over a 12” X 12” surface area produces 144 pounds of force. Would you stand on your tank? Be careful which check valve you use.
J
John Baer
Lititz Precision Products LLC
Lititz PA USA
www.LititzPP.com
Cell (EST USA) (717) 413-7931
Skype: John.Baer7712
From: <owner-rv10-list-server(at)matronics.com (owner-rv10-list-server(at)matronics.com)> on behalf of Tim Olson <Tim(at)MyRV10.com (Tim(at)MyRV10.com)>
Reply-To: <rv10-list(at)matronics.com (rv10-list(at)matronics.com)>
Date: Friday, November 24, 2017 at 7:56 AM
To: <rv10-list(at)matronics.com (rv10-list(at)matronics.com)>
Subject: Re: Re: Ice prevention on fuel vent
If it says 0 psi I would say that is excellent and should be great.
Tim
On Nov 24, 2017, at 3:53 AM, Carlos Trigo <trigo(at)mail.telepac.pt (trigo(at)mail.telepac.pt)> wrote:
| Quote: |
Tim
In the Q+A for this ACS valve, at the Aircraft Spruce website, it says that this valve breakout pressure is 0 psi.
Will this work for this application?
Carlos
Enviado do meu iPhone
No dia 24/11/2017, às 05:12, Tim Olson <Tim(at)MyRV10.com (Tim(at)MyRV10.com)> escreveu:
| Quote: |
Regarding that check valve...I just got around to looking at the link on this
Aircraft Spruce one, Phil.
I know you want one with a very very very low operating pressure (vacuum, actually).
If you get even a couple of psi that it takes to open the valve, your tank will
have probably imploded by then. This valve appears to be for fuel flow
return lines. It doesn't seem to give a spec.
I got a valve from McMaster Carr that had a cracking pressure of .3 psi.
http://www.myrv10.com/N104CD/upgrades/20090525/index.html
I can't say that the valve you linked to is bad, but I would just caution to
make sure that it's probably no more than 1psi of cracking pressure.
Any valve that takes more than that to operate may risk tank
collapse.
Tim
On 11/23/2017 7:20 AM, Phillip Perry wrote:
|
|
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
|
|
|
| Back to top |
|
|
trigo(at)mail.telepac.pt
Guest
|
| Posted: Fri Nov 24, 2017 8:30 am Post subject: Ice prevention on fuel vent |
|
|
By the way, Tim and all the experts in this forum
If the conditions create ice in the tip of the tube (which is in the air stream), why does it nor create ice inside the wing cavity as well?
Is it because the ice is created not only by the air temperature, but also by the positive dynamic pressure in the vent tube tip?
Wondering minds want to know …
Thanks
Carlos
De: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] Em nome de Tim Olson
Enviada: Friday, November 24, 2017 1:02 PM
Para: rv10-list(at)matronics.com
Assunto: Re: Re: Ice prevention on fuel vent
I should have read again before replying... darn.
That check valve will work fine, as would any free flow valve, but, the other down side is your fuel vents are 1/4” tubing and that particular valve uses 3/8” fittings, so you will need to buy additional adapters to fit it in, which may require a little more creativity in mounting. At $27.50 it isn’t super cheap either but looks like good quality. I don’t remember what I paid, but it would be worth checking out what other valves you can find because if you can find one that is 1/8” NPT it may be easier to adapt. That said, mine is brass and is probably heavier than this one is too.
Tim
On Nov 24, 2017, at 3:53 AM, Carlos Trigo <trigo(at)mail.telepac.pt (trigo(at)mail.telepac.pt)> wrote:
| Quote: |
Tim
In the Q+A for this ACS valve, at the Aircraft Spruce website, it says that this valve breakout pressure is 0 psi.
Will this work for this application?
Carlos
Enviado do meu iPhone
No dia 24/11/2017, às 05:12, Tim Olson <Tim(at)MyRV10.com (Tim(at)MyRV10.com)> escreveu:
| Quote: |
Regarding that check valve...I just got around to looking at the link on this
Aircraft Spruce one, Phil.
I know you want one with a very very very low operating pressure (vacuum, actually).
If you get even a couple of psi that it takes to open the valve, your tank will
have probably imploded by then. This valve appears to be for fuel flow
return lines. It doesn't seem to give a spec.
I got a valve from McMaster Carr that had a cracking pressure of .3 psi.
http://www.myrv10.com/N104CD/upgrades/20090525/index.html
I can't say that the valve you linked to is bad, but I would just caution to
make sure that it's probably no more than 1psi of cracking pressure.
Any valve that takes more than that to operate may risk tank
collapse.
Tim
On 11/23/2017 7:20 AM, Phillip Perry wrote:
|
|
| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
|
|
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
