From: "Charlie England" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: fuel system peer review
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Date: Tue, 21 Mar 2017 15:59:25 -0500
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On 3/21/2017 9:37 AM, Tom Mann wrote:
> >I'm willing to live with the risk of a clogged vent. If a vent clogs, 
> I'll be coming down faster from fuel starvation than from over 
> pressurizing the tank
> _______________________________________________________________________________________________________________
> I recently reconfigured the fuel system in my Velocity.
> The wing tanks drain to a split (left/right) sump tank.
> All tanks are vented to a common manifold which sits up high and has 
> two vents for redundancy.
> Each side of the sump is vented to the manifold with an inline check 
> valve. That allows  air out of the sump but not in,
> Each wing (Strake) tank is vented  to the manifold.
> As a safety measure the manifold  has a check valve that allows air to 
> flow into the vent system (from the cabin) should the external vent 
> ever become obstructed.
> Since the system would normally be slightly pressurized, the check 
> valve is typically closed.
> 2 cents & change.
> T Mann
Unfortunately, gravity fed sumps aren't feasible in an RV-x. The 
quickdrain on the wing tank is the lowest point in the fuel system.

I've tried to keep the actual fuel delivery path and vent system in the 
fuselage as close to stock as possible; the transfer idea is the 
farthest I've strayed from that path, and it's unlikely it will end up 
in the plane.

Thanks,

Charlie


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    <div class="moz-cite-prefix">On 3/21/2017 9:37 AM, Tom Mann wrote:<br>
    </div>
    <blockquote cite="mid:list-9592399@logan.com" type="cite">
      <div dir="ltr">
        <div style="FONT-SIZE: 12pt; FONT-FAMILY: 'Calibri'; COLOR:
          #000000">
          <div><font face="Times New Roman">&gt;I'm willing to live with
              the risk of a clogged vent. If a vent clogs, I'll be
              coming down faster from fuel starvation than from over
              pressurizing the tank</font></div>
          <div><font face="Times New Roman">_______________________________________________________________________________________________________________</font></div>
          <div><font face="Times New Roman">I recently reconfigured the
              fuel system in my Velocity.</font></div>
          <div><font face="Times New Roman">The wing tanks drain to a
              split (left/right) sump tank.</font></div>
          <div><font face="Times New Roman">All tanks are vented to a
              common manifold which sits up high and has two vents for
              redundancy.</font></div>
          <div><font face="Times New Roman">Each side of the sump is
              vented to the manifold with an inline check valve. That
              allows  air out of the sump but not in,</font></div>
          <div><font face="Times New Roman">Each wing (Strake) tank is
              vented  to the manifold.</font></div>
          <div><font face="Times New Roman">As a safety measure the
              manifold  has a check valve that allows air to flow into
              the vent system (from the cabin) should the external vent
              ever become obstructed.</font></div>
          <div><font face="Times New Roman">Since the system would
              normally be slightly pressurized, the check valve is
              typically closed.</font></div>
          <div> </div>
          <div><font face="Times New Roman">2 cents &amp; change.</font></div>
          <div> </div>
          <div><font face="Times New Roman">T Mann</font></div>
        </div>
      </div>
    </blockquote>
    Unfortunately, gravity fed sumps aren't feasible in an RV-x. The
    quickdrain on the wing tank is the lowest point in the fuel system.<br>
    <br>
    I've tried to keep the actual fuel delivery path and vent system in
    the fuselage as close to stock as possible; the transfer idea is the
    farthest I've strayed from that path, and it's unlikely it will end
    up in the plane.<br>
    <br>
    Thanks,<br>
    <br>
    Charlie<br>
    <br>
    <br>
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