Return-Path: Received: from seraph2.grc.nasa.gov ([128.156.10.11] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2891531 for flyrotary@lancaironline.net; Mon, 15 Dec 2003 09:05:13 -0500 Received: from lombok-fi.grc.nasa.gov (lombok-fi.grc.nasa.gov [139.88.112.33]) by seraph2.grc.nasa.gov (Postfix) with ESMTP id 9A78768A77 for ; Mon, 15 Dec 2003 09:05:12 -0500 (EST) Received: from apataki-fi.grc.nasa.gov (apataki-fi.grc.nasa.gov [139.88.112.35]) by lombok-fi.grc.nasa.gov (NASA GRC TCPD 8.12.10/8.12.10) with ESMTP id hBFE5CQx006187 for ; Mon, 15 Dec 2003 09:05:12 -0500 (EST) Received: from GR7700002171.lerc.nasa.gov (gr7700002171.grc.nasa.gov [139.88.139.35]) by apataki-fi.grc.nasa.gov (8.12.10 GRC/8.12.10) with ESMTP id hBFE5Bid002888; Mon, 15 Dec 2003 09:05:11 -0500 (EST) X-Info: ODIN / NASA Glenn Research Center Message-Id: <5.1.1.5.2.20031215085438.016f6dc0@popserve.lerc.nasa.gov> X-Sender: scberki@popserve.lerc.nasa.gov X-Mailer: QUALCOMM Windows Eudora Version 5.1.1 Date: Mon, 15 Dec 2003 09:05:07 -0500 To: "Rotary motors in aircraft" From: Joseph M Berki Subject: Re: [FlyRotary] Re: Fuel System Cc: "Rotary motors in aircraft" In-Reply-To: Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="=====================_5587312==.ALT" --=====================_5587312==.ALT Content-Type: text/plain; charset="us-ascii"; format=flowed Rusty, I am thinking about making the system one tank by building a tunnel between the tanks with a sump in the middle. Two pumps would draw from the sump. I was thinking of the second pump as backup. Each pump would have a filter then teed together to a regulator and then split into two fuel rails maybe front rotor and rear rotor. The returns go to port or starboard tanks. Joe At 07:11 AM 12/15/2003 -0600, Russell Duffy wrote: >I am still looking at different designs for a fuel system. AC has two >separate tanks. Since we are using two rotors is it possible to split the >fuel rail into two rails and have one of the returns plumbed to the port >tank and the other plumbed to the starboard tank? Any problems splitting >the fuel rail? Just a crazy idea. > >Joe Berki > >You could certainly have two separate fuel rails, split either >primary/secondary, or rotor-1/rotor-2. You would need a second regulator, >and would have to run two pumps all the time. > >Were you thinking about feeding one rotor from each tank, to keep from >having to ever switch tanks in flight? That is an interesting thought, >though it would probably be safer to split the fuel primary/secondary. I >actually thought about doing that back when I was having so much trouble >with my mismatched primary and secondary injectors. I figured I could >modify the pressure to the rails, to balance them out. Never tried it >though, and the rev-2 FWF arrangement will have matching injectors finally. > >Cheers, >Rusty (the one who usually has the crazy ideas ) > > --=====================_5587312==.ALT Content-Type: text/html; charset="us-ascii" Rusty,
I am thinking about making the system one tank by building a tunnel between the tanks with a sump in the middle. Two pumps would draw from the sump. I was thinking of the second pump as backup. Each pump would have a filter then teed together to a regulator and then split into two fuel rails maybe front rotor and rear rotor. The returns go to port or starboard tanks.

Joe

At 07:11 AM 12/15/2003 -0600, Russell Duffy wrote:

I am still looking at different designs for a fuel system. AC has two
separate tanks. Since we are using two rotors is it possible to split the
fuel rail into two rails and have one of the returns plumbed to the port
tank and the other plumbed to the starboard tank? Any problems splitting
the fuel rail? Just a crazy idea.

Joe Berki

You could certainly have two separate fuel rails, split either primary/secondary, or rotor-1/rotor-2. You would need a second regulator, and would have to run two pumps all the time.

Were you thinking about feeding one rotor from each tank, to keep from having to ever switch tanks in flight? That is an interesting thought, though it would probably be safer to split the fuel primary/secondary. I actually thought about doing that back when I was having so much trouble with my mismatched primary and secondary injectors. I figured I could modify the pressure to the rails, to balance them out. Never tried it though, and the rev-2 FWF arrangement will have matching injectors finally.

Cheers,
Rusty (the one who usually has the crazy ideas <g>)

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