X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-iw0-f180.google.com ([209.85.214.180] verified) by logan.com (CommuniGate Pro SMTP 5.3.7) with ESMTP id 4341109 for flyrotary@lancaironline.net; Wed, 09 Jun 2010 01:38:56 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.214.180; envelope-from=bartrim@gmail.com Received: by iwn36 with SMTP id 36so4408577iwn.25 for ; Tue, 08 Jun 2010 22:38:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:subject:from:to:in-reply-to :references:content-type:date:message-id:mime-version:x-mailer; bh=q7p1j7x5KZs94fI53gZgRxYKUfrTFyOPtwIlyNepYd8=; b=pzbxPnYeEn5467m1I/+Q/8q1Iq3wYNqs36GmyxIMv88V+qLtIO/ukZUi4YLjT5A/xq sswdCaIeV1k7bUx/kuU7FT8jC3kMNv/k+HWGXuZzhyjNxY8vs8+4Zb8PFzZaYMOB1yoG JWq/ov4RYack7kPldzImOCIn2lrIKzBvH4Js8= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=subject:from:to:in-reply-to:references:content-type:date:message-id :mime-version:x-mailer; b=bKAEtq3mXOtgSi31WTRUAAT4rTgMpYmRb89NcSvwzz/FRtkNfrwkX9udaWdUc4IwEb cdVsBzewz1kj2yHVc818e4Nldk/ESS5NKrTwVjl1FUBFHUO+SbmAf9zqGFWMrn8OhqAN bXPb7a2hnCpMfrmRxmo2jQt9cipN8fOejg9l8= Received: by 10.231.174.201 with SMTP id u9mr2323124ibz.17.1276061900961; Tue, 08 Jun 2010 22:38:20 -0700 (PDT) Return-Path: Received: from [192.168.1.64] (d154-20-252-161.bchsia.telus.net [154.20.252.161]) by mx.google.com with ESMTPS id t28sm29301091ibg.6.2010.06.08.22.38.19 (version=SSLv3 cipher=RC4-MD5); Tue, 08 Jun 2010 22:38:20 -0700 (PDT) Subject: Re: [FlyRotary] Re: high/low pressure pumps question From: Todd Bartrim To: Rotary motors in aircraft In-Reply-To: References: Content-Type: multipart/alternative; boundary="=-w4ODVH4bMoVR0S9ewXtG" Date: Tue, 08 Jun 2010 22:38:18 -0700 Message-Id: <1276061898.1051.98.camel@Endurance> Mime-Version: 1.0 X-Mailer: Evolution 2.22.3.1 --=-w4ODVH4bMoVR0S9ewXtG Content-Type: text/plain Content-Transfer-Encoding: 7bit Steve; I believe the bubbles you are seeing in the line is very likely the evaporative emissions, that resulted in the development of the return-less fuel system. I also have never seen foaming in gasoline, but diesel on the other hand, can foam easily. So unless Jet fuel is in the plans I wouldn't worry about that. Todd -----Original Message----- From: Steven W. Boese Reply-To: Rotary motors in aircraft To: Rotary motors in aircraft Subject: [FlyRotary] Re: high/low pressure pumps question Date: Tue, 8 Jun 2010 13:33:19 -0600 Kelly, When the statement was made that the air would eventually be eliminated through the vent, I didn't mean to imply that it was necessary to have this happen. It would be best to avoid drawing the bubbles directly into the fuel supply line which would only happen if the fuel was returned very close to the supply inlet. On one wing tank, I have the return entering center of the root rib about a foot away from the supply inlet. For the other tank, the return outlet is next to the filler cap which is always above the fuel level and as far away from the supply inlet as is possible. No difference in operation of the two tanks has been noticed. A reason given for returning the fuel below the liquid level has been to reduce foaming. There may be other reasons. I haven't seen much tendency for gasoline to foam under conditions present in my system. Steve Boese RV6A, 1986 13B NA, RD1A, EC2 ________________________________________________________________________ From: Rotary motors in aircraft [flyrotary@lancaironline.net] On Behalf Of Kelly Troyer [keltro@att.net] Sent: Tuesday, June 08, 2010 11:26 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: high/low pressure pumps question Guys, Very enlightening and truly food for thought to those of us still in the construction stage...........I have just one more question to ask............Previous info seemed to indicate that return fuel should be entering the fuel tank at the bottom or at least close to the bottom.............In light of Steve's observations would it seem reasonable that air bubbles in the return fuel would be eliminated to the tank vent faster if the return line was at the top or close to the top of the tank ??................ Kelly Troyer "Dyke Delta"_13B ROTARY Engine "RWS"_RD1C/EC2/EM2 "Mistral"_Backplate/Oil Manifold --=-w4ODVH4bMoVR0S9ewXtG Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 7bit Steve;
    I believe the bubbles you are seeing in the line is very likely the evaporative emissions, that resulted in the development of the return-less fuel system.
    I also have never seen foaming in gasoline, but diesel on the other hand, can foam easily. So unless Jet fuel is in the plans I wouldn't worry about that.

Todd


-----Original Message-----
From: Steven W. Boese <SBoese@uwyo.edu>
Reply-To: Rotary motors in aircraft <flyrotary@lancaironline.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: high/low pressure pumps question
Date: Tue, 8 Jun 2010 13:33:19 -0600


Kelly,   When the statement was made that the air would eventually be eliminated through the vent, I didn't mean to imply that it was necessary to have this happen.  It would be best to avoid drawing the bubbles directly into the fuel supply line which would only happen if the fuel was returned very close to the supply inlet.   On one wing tank, I have the return entering center of the root rib about a foot away from the supply inlet.  For the other tank, the return outlet is next to the filler cap which is always above the fuel level and as far away from the supply inlet as is possible.  No difference in operation of the two tanks has been noticed.   A reason given for returning the fuel below the liquid level has been to reduce foaming.  There may be other reasons.  I haven't seen much tendency for gasoline to foam under conditions present in my system.   Steve Boese RV6A, 1986 13B NA, RD1A, EC2     

From: Rotary motors in aircraft [flyrotary@lancaironline.net] On Behalf Of Kelly Troyer [keltro@att.net]
Sent: Tuesday, June 08, 2010 11:26 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: high/low pressure pumps question




Guys,   Very enlightening and truly food for thought to those of us still in the construction stage...........I have just one more question to ask............Previous info seemed to indicate that return fuel should be entering the fuel tank at the bottom or at least close to the bottom.............In light of Steve's observations would it seem reasonable that air bubbles in the return fuel would be eliminated to the tank vent faster if the return line was at the top or close to the top of the tank ??................  
  Kelly Troyer
"Dyke Delta"_13B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold


--=-w4ODVH4bMoVR0S9ewXtG--