No subject

Fri Jan 7 11:48:45 CST 2011

see
a vent coming from the top of the sump.  I see two lines coming into a
manifold block just above the spar, and a line to a check valve - then
apparently through the firewall.

=20

Are the two lines into the block from the strakes?  Where does the line =
go
to the wheel well?  It may be that that check valve is intended to let =
air
in, and not let fuel out.

=20

In any case; if the vent lines do not extend up above the top of the =
strakes
before going to an exit; when fuel is near full you will lose fuel out =
of
the lines in climb or turbulence. If the lines vent out at the wheel =
well
that fuel will very likely result in fumes into the cabin.

=20

Best to look closely at where the lines run, understand how they need to
function, and go from there.  It may be the installation is not as it =
needs
to be prevent loss of fuel.

=20

Al

=20

=20

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of aminetech at bluefrog.com
Sent: Sunday, January 30, 2011 11:37 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Fuel Vent System

=20

--- ALVentures at cox.net wrote:

From: "Al Gietzen" <ALVentures at cox.net>
To: "'Velocity Aircraft Owners and Builders list'" <reflector at tvbf.org>
Subject: Re: REFLECTOR: Fuel Vent System
Date: Sun, 30 Jan 2011 11:25:09 -0800

=20

I have an overflow vent installed in each tank. =20

If you are talking about the 'vent' system that allows air in as fuel =
goes
out; or air out of the sump as fuel initially goes in, then it is =
obviously
a requirement.  If you mean an overflow line, that is something =
different
entirely, and not a normal part of the design.

=20

It's an overflow line.=20

 =20

The vent system should follow the principles of the example given in the
manual - allow air into the highest point of each strake tank and sump =
tank;
then go to some high point above any level in the tanks (including
consideration of climb angle), and then out the bottom of the fuselage.=20

 =20

Al=20

 =20

 _______________________________________________ To change your email
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<div class=3DSection1>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'>John; </span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'>&nbsp;</span></font></p>

From the photos I can&#8217;t =
tell much
of anything about the vent system.&nbsp; I see a vent coming from the =
top of
the sump. &nbsp;I see two lines coming into a manifold block just above =
the
spar, and a line to a check valve &#8211; then apparently through the =
firewall.

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'>Are the two lines into the block =
from
the strakes?&nbsp; Where does the line go to the wheel well?&nbsp; It =
may be
that that check valve is intended to let air in, and not let fuel =
out.</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'>&nbsp;</span></font></p>

In any case; if the vent lines do =
not
extend up above the top of the strakes before going to an exit; when =
fuel is
near full you will lose fuel out of the lines in climb or turbulence. If =
the
lines vent out at the wheel well that fuel will very likely result in =
fumes into
the cabin.

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'>Best to look closely at where the =
lines
run, understand how they need to function, and go from there.&nbsp; It =
may be
the installation is not as it needs to be prevent loss of =
fuel.</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'>Al</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'>&nbsp;</span></font></p>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'>-----Original =
Message-----<br>
<b><span style=3D'font-weight:bold'>From:</span></b> =
reflector-bounces at tvbf.org
[mailto:reflector-bounces at tvbf.org] <b><span =
style=3D'font-weight:bold'>On Behalf
Of </span></b>aminetech at bluefrog.com<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Sunday, January 30, =
2011
11:37 AM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> Velocity Aircraft =
Owners and
Builders list<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> Re: REFLECTOR: =
Fuel Vent
System</span></font></p>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'>&nbsp;</span></font></p>

<div>

<p class=3DMsoNormal =
style=3D'margin-right:0in;margin-bottom:12.0pt;margin-left:
.5in'><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'><br>
<br>
--- ALVentures at cox.net wrote:<br>
<br>
From: &quot;Al Gietzen&quot; &lt;ALVentures at cox.net&gt;<br>
To: &quot;'Velocity Aircraft Owners and Builders list'&quot;
&lt;reflector at tvbf.org&gt;<br>
Subject: Re: REFLECTOR: Fuel Vent System<br>
Date: Sun, 30 Jan 2011 11:25:09 -0800</span></font></p>

<div>

<p style=3D'margin-left:.5in'><font size=3D2 face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial'>&nbsp;</span></font></p>

</div>

<div>

<div>

<p style=3D'margin-left:1.0in'><font size=3D2 face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial'>I have an overflow vent installed in each =
tank.&nbsp;
</span></font></p>

</div>

<p style=3D'margin-left:.5in'><font size=3D2 color=3Dblue =
face=3DVerdana><span
style=3D'font-size:11.0pt;font-family:Verdana;color:blue'>If you are =
talking
about the &#8216;vent&#8217; system that allows air in as fuel goes out; =
or air
out of the sump as fuel initially goes in, then it is obviously a
requirement.&nbsp; If you mean an overflow line, that is something =
different
entirely, and not a normal part of the design.</span></font></p>

</div>

<p style=3D'margin-left:.5in'><font size=3D2 face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial'>&nbsp;</span></font></p>

</div>

<p style=3D'margin-left:.5in'><font size=3D2 color=3Dblue =
face=3DVerdana><span
style=3D'font-size:11.0pt;font-family:Verdana;color:blue'>It's an =
overflow line.</span></font>
</p>

<p style=3D'margin-left:.5in'><font size=3D3 face=3D"Times New =
Roman"><span
style=3D'font-size:12.0pt'>&nbsp; </span></font></p>

<p style=3D'margin-left:.5in'><font size=3D2 color=3Dblue =
face=3DVerdana><span
style=3D'font-size:11.0pt;font-family:Verdana;color:blue'>The vent =
system should
follow the principles of the example given in the manual &#8211; allow =
air into
the highest point of each strake tank and sump tank; then go to some =
high point
above any level in the tanks (including consideration of climb angle), =
and then
out the bottom of the fuselage.</span></font> </p>

<p style=3D'margin-left:.5in'><font size=3D3 face=3D"Times New =
Roman"><span
style=3D'font-size:12.0pt'>&nbsp; </span></font></p>

<p style=3D'margin-left:.5in'><font size=3D2 color=3Dblue =
face=3DVerdana><span
style=3D'font-size:11.0pt;font-family:Verdana;color:blue'>Al</span></font=
> </p>

<p style=3D'margin-left:.5in'><font size=3D3 face=3D"Times New =
Roman"><span
style=3D'font-size:12.0pt'>&nbsp; </span></font></p>

&nbsp;________________________________________=
_______
To change your email address, visit <a
href=3D"http://www.tvbf.org/mailman/listinfo/reflector">http://www.tvbf.o=
rg/mailman/listinfo/reflector</a>
Visit the gallery! www.tvbf.org/gallery user:pw =3D tvbf:jamaicangoose =
Check new
archives: www.tvbf.org/pipermail Check old archives: <a
href=3D"http://www.tvbf.org/archives/velocity/maillist.html">http://www.t=
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