Today's Message Index:
----------------------
1. 05:15 PM - Re: Amps spike when transmitting on comm2 (rwwende)
2. 07:15 PM - Fuel Return Line Location? (Berck E. Nash)
3. 08:08 PM - Re: Fuel Return Line Location? (Justin Jones)
4. 08:36 PM - Re: Fuel Return Line Location? (David Saylor)
5. 09:40 PM - Re: Fuel Return Line Location? (Bob Turner)
6. 09:48 PM - Re: Fuel Return Line Location? (Berck E. Nash)
7. 09:55 PM - Re: Fuel Return Line Location? (Justin Jones)
Message 1
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| Subject: | Re: Amps spike when transmitting on comm2 |
Well I think I finally found the cause of this problem. The sl40 comes with 12"
pig tail coax attached to the tray. It has a nut type connector that pinches
the shield to the connector, and it was loose. I tighten the nut and it solved
the problem.
The actual amp draw indicated on the vpx-pro when transmitting ranged from 2.5
at the higher freqs, and 4.5 at the lower freqs, 123.x and below. The amp gauge
on the EFIS only spiked when I transmitted on the lower freqs.
If you are having this issue, check the coax at the back of the tray.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=441012#441012
Message 2
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| Subject: | Fuel Return Line Location? |
We're planning on EFII, so we need a full-sized return line for both
sides. Just now starting work on the fuel tank, and I'd like to get
this sorted before we get too far. I've spent awhile searching, and
have only managed to find lots of places not to put the port for the
fuel return line. Apparently it can interfere with both the wing spar
and the aileron return line. Does anyone have a clear diagram of where
I can safely put it? A hint about which flange/fittings to buy would be
greatly appreciated as well. Thanks in advance!
Berck
Message 3
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| Subject: | Re: Fuel Return Line Location? |
Berck,
I am using an EFII system as well. Just a thought, but I put a normal L/R/Both/Off
fuel valve on the supply side (AN6) and an AN6 size return line that Splits
to each tank. After the "T" I put a simple Parker petroleum 1/4 turn ball valve
on each side just before the tank. Now, I can shut one or the other return
valves off, turn on the fuel pump, and transfer fuel on the ground. It can also
be done in the air (with caution of course) to trim fuel.
Note: I'm building a Bushcaddy not an rv10.
I can send pics if you would like.
Justin
> On Apr 19, 2015, at 18:10, Berck E. Nash <flyboy@gmail.com> wrote:
>
>
> We're planning on EFII, so we need a full-sized return line for both
> sides. Just now starting work on the fuel tank, and I'd like to get
> this sorted before we get too far. I've spent awhile searching, and
> have only managed to find lots of places not to put the port for the
> fuel return line. Apparently it can interfere with both the wing spar
> and the aileron return line. Does anyone have a clear diagram of where
> I can safely put it? A hint about which flange/fittings to buy would be
> greatly appreciated as well. Thanks in advance!
>
> Berck
>
>
>
>
Message 4
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| Subject: | Re: Fuel Return Line Location? |
Hi Justin,
You are of course free to build whatever fuel system you like, but the one
you described has some issues.
I think you'd be better off with a L-R-OFF duplex fuel valve that routes
return fuel to the same tank you're burning from. You're headed towards a
scenario that makes it pretty easy to mismanage the fuel:
You could return to a full tank and waste fuel overboard;
You could unport an empty tank in "BOTH" and starve the engine;
You could turn off both return valves and...I don't know what, but it seems
bad.
Please consider a simpler system. Caution never goes as far as we think it
will.
--Dave
On Sun, Apr 19, 2015 at 8:00 PM, Justin Jones <jmjones2000@mindspring.com>
wrote:
>
> Berck,
>
> I am using an EFII system as well. Just a thought, but I put a normal
> L/R/Both/Off fuel valve on the supply side (AN6) and an AN6 size return
> line that Splits to each tank. After the "T" I put a simple Parker
> petroleum 1/4 turn ball valve on each side just before the tank. Now, I can
> shut one or the other return valves off, turn on the fuel pump, and
> transfer fuel on the ground. It can also be done in the air (with caution
> of course) to trim fuel.
>
> Note: I'm building a Bushcaddy not an rv10.
>
> I can send pics if you would like.
>
> Justin
>
>
> > On Apr 19, 2015, at 18:10, Berck E. Nash <flyboy@gmail.com> wrote:
> >
> >
> > We're planning on EFII, so we need a full-sized return line for both
> > sides. Just now starting work on the fuel tank, and I'd like to get
> > this sorted before we get too far. I've spent awhile searching, and
> > have only managed to find lots of places not to put the port for the
> > fuel return line. Apparently it can interfere with both the wing spar
> > and the aileron return line. Does anyone have a clear diagram of where
> > I can safely put it? A hint about which flange/fittings to buy would be
> > greatly appreciated as well. Thanks in advance!
> >
> > Berck
> >
> >
> >
> >
>
>
Message 5
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| Subject: | Re: Fuel Return Line Location? |
Since he's building a high wing I don't think unporting on both is an issue.
But I agree with your other comments.
--------
Bob Turner
RV-10 QB
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=441029#441029
Message 6
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| Subject: | Re: Fuel Return Line Location? |
I'm leaning toward a duplex valve, but I'm also considering two fuel
valves, one for the source and one for the return. This isn't that
different than jets I've flown, and I think I can handle the
"complexity". It's cheaper and it gives the advantage of being able to
transfer fuel, which might come in handy. Regardless, none of the
answers so far tell me where to tap the return line:)
Message 7
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| Subject: | Re: Fuel Return Line Location? |
Dave,
I understand your concern and welcome any ideas and thoughts that may be
cause for issues. The issues you brought up have been considered and
here is what I have come up with. Note that I have spoken with many
others about this as well, but it doesn=99t mean that we aren=99
t missing something.
The normal configuration (covered on the before take-off checklist)
would be both return valves open and the fuel valve on both. The
transfer of fuel during refueling operations (while the aircraft is on
floats) is one reason for this setup, and the other is the ability to
draw fuel from both tanks simultaneously.
=9CYou could return to a full tank and waste fuel overboard=9D
- This scenario could present itself, but would cause an over-pressure
situation due to the vent size. The digital engine monitor senses fuel
pressure and sounds an audio and visual alarm when it is either too high
or too low.
=9CYou could unport an empty tank into =9CBOTH=9D and
starve the engine=9D - This scenario has also been tested. With
one tank empty, one tank full, and the selector to =9CBOTH=9D,
there was still full fuel pressure. This may be due to the high-wing
design and the fuel system plumbing called for by Robert Paisley of
EFII.
=9CYou could turn off both return valves and I don=99
t know what, but it seems bad=9D - It would cause the fuel to back
up at the valves, and the fuel pressure would increase to the maximum
that the GL393 fuel pump would put out. This would be 105 PSI at 10
Gallons per hour. Not sustainable, but not harmful to the injectors or
fuel lines for short periods of time. Again, the Engine Monitor will
alarm when the fuel pressure begins to increase. The fuel system has
been tested to the fuel pump stall pressure of 115 PSI and found to have
no leaks.
I fly C-130s and King Air 200s and they both have fuel systems that are
far more complicated. Flying aircraft will always require thought. With
the duplex fuel valve, the pilot must remember to switch the fuel valves
when it is necessary. I like the idea of being able to operate in a
normal scenario with the fuel valve on both, and have the fuel is return
to both tanks. If the situation arises, I can put the fuel where it is
needed and I have a good monitoring system that will alert me if I make
a mistake in the positioning of fuel valves. The return valves do not
have a position that will cause the engine to quit turning.
Thoughts?
Thanks for your input.
Respectfully,
Justin
> On Apr 19, 2015, at 7:30 PM, David Saylor <saylor.dave@gmail.com>
wrote:
>
> Hi Justin,
>
> You are of course free to build whatever fuel system you like, but the
one you described has some issues.
>
> I think you'd be better off with a L-R-OFF duplex fuel valve that
routes return fuel to the same tank you're burning from. You're headed
towards a scenario that makes it pretty easy to mismanage the fuel:
>
> You could return to a full tank and waste fuel overboard;
>
> You could unport an empty tank in "BOTH" and starve the engine;
>
> You could turn off both return valves and...I don't know what, but it
seems bad.
>
> Please consider a simpler system. Caution never goes as far as we
think it will.
>
> --Dave
>
>
>
> On Sun, Apr 19, 2015 at 8:00 PM, Justin Jones
<jmjones2000@mindspring.com <mailto:jmjones2000@mindspring.com>> wrote:
<jmjones2000@mindspring.com <mailto:jmjones2000@mindspring.com>>
>
> Berck,
>
> I am using an EFII system as well. Just a thought, but I put a normal
L/R/Both/Off fuel valve on the supply side (AN6) and an AN6 size return
line that Splits to each tank. After the "T" I put a simple Parker
petroleum 1/4 turn ball valve on each side just before the tank. Now, I
can shut one or the other return valves off, turn on the fuel pump, and
transfer fuel on the ground. It can also be done in the air (with
caution of course) to trim fuel.
>
> Note: I'm building a Bushcaddy not an rv10.
>
> I can send pics if you would like.
>
> Justin
>
>
> > On Apr 19, 2015, at 18:10, Berck E. Nash <flyboy@gmail.com
<mailto:flyboy@gmail.com>> wrote:
> >
<mailto:flyboy@gmail.com>>
> >
> > We're planning on EFII, so we need a full-sized return line for both
> > sides. Just now starting work on the fuel tank, and I'd like to get
> > this sorted before we get too far. I've spent awhile searching, and
> > have only managed to find lots of places not to put the port for the
> > fuel return line. Apparently it can interfere with both the wing
spar
> > and the aileron return line. Does anyone have a clear diagram of
where
> > I can safely put it? A hint about which flange/fittings to buy would
be
> > greatly appreciated as well. Thanks in advance!
> >
> > Berck
> >
> >
> >
> >
>
>
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