X-Virus-Scanned: clean according to Sophos on Logan.com From: "Tom Mann" Received: from mail.infosaic.com ([216.226.148.38] verified) by logan.com (CommuniGate Pro SMTP 6.2c1) with ESMTPS id 9592393 for flyrotary@lancaironline.net; Tue, 21 Mar 2017 10:38:02 -0400 Received-SPF: none receiver=logan.com; client-ip=216.226.148.38; envelope-from=tmann@n200lz.com Received: from DSS04 (v-209-134-133-68.ip.visi.com [209.134.133.68]) by mail.infosaic.com with SMTP (version=Tls12 cipher=Aes128 bits=128); Tue, 21 Mar 2017 10:41:22 -0400 Message-ID: <6347119E348C45A09BC0AA0B2BF3598C@DSS04> Reply-To: "Tom Mann" To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary] Re: fuel system peer review Date: Tue, 21 Mar 2017 09:37:16 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_12B5_01D2A226.BA3973B0" X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 16.4.3528.331 X-MimeOLE: Produced By Microsoft MimeOLE V16.4.3528.331 This is a multi-part message in MIME format. ------=_NextPart_000_12B5_01D2A226.BA3973B0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable >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 ------=_NextPart_000_12B5_01D2A226.BA3973B0 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable
>I'm willing to live with the = risk of a=20 clogged vent. If a vent clogs, I'll be coming down faster from fuel = starvation=20 than from over pressurizing the tank
__________________________________________________________________= _____________________________________________
I recently reconfigured the fuel = system in my=20 Velocity.
The wing tanks drain to a split = (left/right)=20 sump tank.
All tanks are vented to a common = manifold=20 which sits up high and has two vents for redundancy.
Each side of the sump is vented to = the=20 manifold with an inline check valve. That allows  air out of the = sump but=20 not in,
Each wing (Strake) tank is = vented  to the=20 manifold.
As a safety measure the = manifold  has a=20 check valve that allows air to flow into the vent system (from the = cabin) should=20 the external vent ever become obstructed.
Since the system would normally be = slightly=20 pressurized, the check valve is typically closed.
 
2 cents & change.
 
T = Mann
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