X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-pv0-f180.google.com ([74.125.83.180] verified) by logan.com (CommuniGate Pro SMTP 5.3.7) with ESMTP id 4337970 for flyrotary@lancaironline.net; Sun, 06 Jun 2010 03:21:43 -0400 Received-SPF: pass receiver=logan.com; client-ip=74.125.83.180; envelope-from=bartrim@gmail.com Received: by pvg7 with SMTP id 7so2088849pvg.25 for ; Sun, 06 Jun 2010 00:21:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:received :in-reply-to:references:date:message-id:subject:from:to:content-type; bh=2Xqk2QDcBP/P6PGw4WmUKU6y3/v8WT/isTLkF321edw=; b=Qj5sq2ySCEoLaTs+o6zMNqwQBS3x8vlGwWfFphZaVws535Ld/hgP+kCWx27by+Ku0M kIbgfBuIEepxne91k8dxY6JTN484ir7ffVKjSybevqWj+cOt05uVNBSQ2Wmt+iPufQkb WU2vxOzle/E7C5bE7qrTq6YGbvYcNx+xRdnX4= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=RQuIQYTyAlYulwJ8uh6I8Uo2Gk07cbczhh/AaM+ty1vYSpmWrmcPcdA7dy1nleWaDq zrqs8PAvXv7l5bp33Isj3zUFTN07VcU3vZ6WRPeaB3BCJCV+lQEBvxAJjLEcQ1uwY58l w3PXd2jNDYKSiWE3NXCtAsUtLBnFTXdbc3ij0= MIME-Version: 1.0 Received: by 10.141.124.10 with SMTP id b10mr10374126rvn.176.1275808867027; Sun, 06 Jun 2010 00:21:07 -0700 (PDT) Received: by 10.141.49.20 with HTTP; Sun, 6 Jun 2010 00:21:06 -0700 (PDT) Received: by 10.141.49.20 with HTTP; Sun, 6 Jun 2010 00:21:06 -0700 (PDT) In-Reply-To: References: Date: Sun, 6 Jun 2010 00:21:06 -0700 Message-ID: Subject: Re: [FlyRotary] Re: high/low pressure pumps question From: Todd Bartrim To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=000325564f0a520f8304885766b4 --000325564f0a520f8304885766b4 Content-Type: text/plain; charset=ISO-8859-1 Hi Charlie; Hmmmnn, I gotta say a picture (or drawing) is worth a thousand words. Todd (sent on my new-fangled google phone with a really damn small keyboard) On 2010-06-05 8:46 PM, "Charlie England" wrote: Hi Todd, My thought is to set up the fuel path thus: fuel source through a T into injection pumps, through filters, through combining T, through the regulator(in cockpit), through firewall to engine. The regulator's bypass port (in the cockpit) would be plumbed just like yours, except no heat exchanger since the bypass fuel would never see the heat of the engine compartment. The bypass would still T into the supply to the injection pumps, like your system. Obviously, a manifold pressure line would be required through the firewall into the cockpit to the pressure regulator. My original plan (different injection that didn't require a return line) was similar to your selector setup: main tanks feeding stock van's selector, with the 3rd port on it being fed by a 2nd vans selector to select either of the 2 aux tanks. No transfer pump would have been required, & no crossover valve. Failure of the primary valve could have been a 'show stopper', but the newer valves seem to be rock solid reliable. Going to this system using the gear type pumps requiring a return line forced re-thinking. Using your idea to return the bypassed fuel at the pump inlet effectively eliminates the 'return' issue, & tempts me to return to the original fuel selector layout, with the addition of a Facet boost pump. The fact that the optical sensors will work looking into the side of a fuel line (the T), instead of needing them in the tank & that they still give almost a full minute's warning, is very encouraging. I'll start looking for a convenient place to mount them. I hope that Tracy will chime in on how he plumbed the regulator on his -8. Many thanks for the extra details. Charlie On 6/5/2010 12:32 PM, Todd Bartrim wrote: > > > > Hi Charlie > > Not sure I understand correctly what you mean? Can you sketch it out > quickly? I'... > > > *From*: Charlie England Charlie%20England%20%3cceengland@bellsout. > .. > > > *Subject*: [FlyRotary] Re: high/low pressure pumps question > > *Date*: Sat, 05 Jun 2010 08:38:09 -0... > -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists... --000325564f0a520f8304885766b4 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable

Hi Charlie;
Hmmmnn, I gotta say a picture (or drawing) is worth a thousand words.
Todd (sent on my new-fangled google phone with a really damn small keyboard= )

On 2010-06-05 8:46 PM, "Charlie England&q= uot; <ceengland@bellsouth.net= > wrote:

Hi Todd,

My thought is to set up the fuel path thus: fuel source through a T into in= jection pumps, through filters, through combining T, through the regulator(= in cockpit), through firewall to engine. The regulator's bypass port (i= n the cockpit) would be plumbed just like yours, except no heat exchanger s= ince the bypass fuel would never see the heat of the engine compartment. Th= e bypass would still T into the supply to the injection pumps, like your sy= stem. Obviously, a manifold pressure line would be required through the fir= ewall into the cockpit to the pressure regulator.

My original plan (different injection that didn't require a return line= ) was similar to your selector setup: main tanks feeding stock van's se= lector, with the 3rd port on it being fed by a 2nd vans selector to select = either of the 2 aux tanks. No transfer pump would have been required, &= no crossover valve. Failure of the primary valve could have been a 'sh= ow stopper', but the newer valves seem to be rock solid reliable. Going= to this system using the gear type pumps requiring a return line forced re= -thinking. Using your idea to return the bypassed fuel at the pump inlet ef= fectively eliminates the 'return' issue, & tempts me to return = to the original fuel selector layout, with the addition of a Facet boost pu= mp. The fact that the optical sensors will work looking into the side of a = fuel line (the T), instead of needing them in the tank & that they stil= l give almost a full minute's warning, is very encouraging. I'll st= art looking for a convenient place to mount them.

I hope that Tracy will chime in on how he plumbed the regulator on his -8.<= br>
Many thanks for the extra details.

Charlie



On 6/5/2010 12:32 PM, Todd= Bartrim wrote:

>
> Hi Charlie
> =A0 =A0Not sure I understand correctly what you mea= n? Can you sketch it out quickly? I'...

> *From*: Charlie England <ceengland@bellsouth.net <mailto:Charlie%20England%20%3cceengland@bel= lsout...

> *Subject*: [FlyRotary] Re: high/low pressur= e pumps question
> *Date*: Sat, 05 Jun 2010 08:38:09 -0...

=


--
Homepage: =A0http://www.flyrotary.com/
Archive and UnSub: =A0 http://mail.lancaironline= .net:81/lists...

--000325564f0a520f8304885766b4--