X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.2 cv=OfraNVbY c=1 sm=1 tr=0 a=K6+9cgiILuTeInaHylnYpw==:117 a=K6+9cgiILuTeInaHylnYpw==:17 a=2JCJgTwv5E4A:10 a=r77TgQKjGQsHNAKrUKIA:9 a=EYqo_6YQADtIwLSr-lIA:9 a=QEXdDO2ut3YA:10 a=mkRtZ_2iHYENAsfxuC8A:9 a=xxY5d2Z3sE9V-PE_:21 a=_W_S_7VecoQA:10 From: "Tom Mann" Received: from mail.infosaic.com ([216.226.148.38] verified) by logan.com (CommuniGate Pro SMTP 6.2c3) with ESMTPS id 10072912 for flyrotary@lancaironline.net; Fri, 01 Sep 2017 09:40:14 -0400 Received-SPF: none receiver=logan.com; client-ip=216.226.148.38; envelope-from=tmann@n200lz.com Received: from DSS04 (ip98-168-218-127.om.om.cox.net [98.168.218.127]) by mail.infosaic.com with SMTP (version=Tls12 cipher=Aes128 bits=128); Fri, 1 Sep 2017 09:46:50 -0400 Message-ID: Reply-To: "Tom Mann" To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary] Re: Fuel system diagram Date: Fri, 1 Sep 2017 08:39:44 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_03DE_01D322FD.DC6CBB60" 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_03DE_01D322FD.DC6CBB60 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable I would suggest using a Left/Right/Both/Off valve for a couple of = reasons. Reason 1# I have a Velocity that I converted to this. It had an issue when feeding = from both tanks to feed unevenly. The previous owner said he would land, = let the fuel settle out and take off again. With the new system if one side feeds unevenly, I can fix it from the = pilots seat by switching to the fullest tank. Reason #2: You take off and lost or didn=E2=80=99t replace a fuel cap on one side. = For the sake of argument, let=E2=80=99s say it was the right tank. If you have a cross feed via your plumbing or the valve (Both/Off) the = vent system tries to slightly pressurize both tanks. The left tank with = the cap will be at a pressure higher the the right tank with no cap. = Over time the the difference will push the fuel through the crossover = into the right tank causing the fuel to overboard. Once the left tank = goes dry you un-port the fuel pickup and now you have a right tank full = of fuel that you cannot access. With a Left/Right/Both/Off valve, you = can switch to the right tank and access that fuel. Again, a situation = that can be resolved from the pilot=E2=80=99s seat using the valve. Reason #3 ........ or you could use a Left/Right/Off valve and avoid both = scenarios. T Mann ------=_NextPart_000_03DE_01D322FD.DC6CBB60 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable
I would suggest using a Left/Right/Both/Off valve for a couple of=20 reasons.
 
Reason 1#
I have a Velocity that I converted to this. It had an issue when = feeding=20 from both tanks to feed unevenly. The previous owner said he would land, = let the=20 fuel settle out and take off again.
With the new system if one side feeds unevenly, I can fix it from = the=20 pilots seat by switching to the fullest tank.
 
Reason #2:
You take off and lost or didn=E2=80=99t replace a fuel cap on one = side. For the=20 sake of argument, let=E2=80=99s say it was the right tank.
If you have a cross feed via your plumbing or the valve (Both/Off) = the vent=20 system tries to slightly pressurize both tanks. The left tank with the = cap will=20 be at a pressure higher the the right tank with no cap. Over time the = the=20 difference will push the fuel through the crossover into the right tank = causing=20 the fuel to overboard. Once the left tank goes dry you un-port the fuel = pickup=20 and now you have a right tank full of fuel that you cannot access. With = a=20 Left/Right/Both/Off valve, you can switch to the right tank and access = that=20 fuel. Again, a situation that can be resolved from the pilot=E2=80=99s = seat using the=20 valve.
 
Reason #3
........ or you could use a Left/Right/Off valve and avoid both=20 scenarios.
 
T Mann=20
------=_NextPart_000_03DE_01D322FD.DC6CBB60--