X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-yx0-f180.google.com ([209.85.213.180] verified) by logan.com (CommuniGate Pro SMTP 5.4.1) with ESMTPS id 5111040 for flyrotary@lancaironline.net; Thu, 01 Sep 2011 19:20:24 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.213.180; envelope-from=rwstracy@gmail.com Received: by yxi11 with SMTP id 11so1356695yxi.25 for ; Thu, 01 Sep 2011 16:19:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=subject:references:from:content-type:x-mailer:in-reply-to :message-id:date:to:content-transfer-encoding:mime-version; bh=awJKf8pF6ch2np7i97nlZi8B+OA0d2HlPTiGQAIBmeA=; b=LTWHNB4VUCIFtEz40nIkTwmTGAjUG1Kg6c7722GLHdbRt3a7cw1vevJIqmFxSINz16 B3o6PLVLqKRn57gFxXWnocH4MUL5anKpMuh84I1Vo+3jEy6CYZ97VP4vqfATxlzpvvlD OY7Egy0JCXsye3yu65+YFcH7QpxqMe8lRSzUg= Received: by 10.91.192.5 with SMTP id u5mr366098agp.136.1314919187546; Thu, 01 Sep 2011 16:19:47 -0700 (PDT) Return-Path: Received: from [75.202.123.185] (185.sub-75-202-123.myvzw.com [75.202.123.185]) by mx.google.com with ESMTPS id o16sm226311anj.8.2011.09.01.16.19.43 (version=TLSv1/SSLv3 cipher=OTHER); Thu, 01 Sep 2011 16:19:46 -0700 (PDT) Subject: Re: [FlyRotary] Re: Pump Suck Lock? References: From: Tracy Content-Type: multipart/alternative; boundary=Apple-Mail-2--542948959 X-Mailer: iPad Mail (8F191) In-Reply-To: Message-Id: <0ED414FB-F1F7-47EB-A4EC-6F0EE967D43E@gmail.com> Date: Thu, 1 Sep 2011 19:19:32 -0400 To: Rotary motors in aircraft Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (iPad Mail 8F191) --Apple-Mail-2--542948959 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii If I understand what you said, your sump tank would buy you about 3.2 minute= s of flight at cruise FF. Worth it? Bottom line is you are limited by the= unusable fuel in the Cozy tanks ( in uncoordinated flight). The sump tank w= on't fix that. Tracy Sent from my iPad On Sep 1, 2011, at 7:02 PM, CozyGirrrl@aol.com wrote: > Please explain drawbacks? > In canards we have small sumps up against the fuselage to more or less pro= vide a low spot for access to fuel. They have been known to run dry when fue= l is down to gallons and fuel is sitting mostly in leading edge. > More importantly in a canard pusher a sump canister closer to the engine c= an significantly reduce the size and run of the high pressure fuel circuit. > In uncoordinated flight the high rate of flow of the EFI circuit could pum= p a small sump dry and return the fuel to the main part of the tank where it= would not be returning to the sump in use. The sump or surge tank could avo= id this. > =20 > Chrissi & Randi > www.CozyGirrrl.com > CG Products, Custom Aircraft Hardware > Chairwomen, Sun-N-Fun Engine Workshop > =20 > In a message dated 9/1/2011 5:41:09 P.M. Central Daylight Time, rwstracy@g= mail.com writes: > Sumps can work but frequently require fixes for their drawbacks. If you d= on't have a really good reason for needing one, why use one? >=20 > Tracy --Apple-Mail-2--542948959 Content-Transfer-Encoding: 7bit Content-Type: text/html; charset=utf-8
If I understand what you said, your sump tank would buy you about 3.2 minutes of flight at cruise FF.   Worth it?  Bottom line is you are limited by the unusable fuel in the Cozy tanks ( in uncoordinated flight). The sump tank won't fix that.

Tracy

Sent from my iPad

On Sep 1, 2011, at 7:02 PM, CozyGirrrl@aol.com wrote:

Please explain drawbacks?
In canards we have small sumps up against the fuselage to more or less provide a low spot for access to fuel. They have been known to run dry when fuel is down to gallons and fuel is sitting mostly in leading edge.
More importantly in a canard pusher a sump canister closer to the engine can significantly reduce the size and run of the high pressure fuel circuit.
In uncoordinated flight the high rate of flow of the EFI circuit could pump a small sump dry and return the fuel to the main part of the tank where it would not be returning to the sump in use. The sump or surge tank could avoid this.
 
Chrissi & Randi
www.CozyGirrrl.com
CG Products, Custom Aircraft Hardware
Chairwomen, Sun-N-Fun Engine Workshop
 
In a message dated 9/1/2011 5:41:09 P.M. Central Daylight Time, rwstracy@gmail.com writes:
Sumps can work but frequently require fixes for their drawbacks.   If you don't have a really good reason for needing one, why use one?

Tracy
--Apple-Mail-2--542948959--