Return-Path: Received: from [24.227.161.51] (HELO qnsi-xch.qnsi.net) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP id 817050 for flyrotary@lancaironline.net; Wed, 23 Mar 2005 10:02:39 -0500 Received-SPF: none receiver=logan.com; client-ip=24.227.161.51; envelope-from=bhughes@qnsi.net X-MimeOLE: Produced By Microsoft Exchange V6.5.6944.0 Content-class: urn:content-classes:message Return-Receipt-To: "Bobby J. Hughes" MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C52FB9.BA7719F0" Disposition-Notification-To: "Bobby J. Hughes" Subject: RE: [FlyRotary] Re: Fuel system Sketch Rev1 Date: Wed, 23 Mar 2005 09:05:18 -0600 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Re: Fuel system Sketch Rev1 Thread-Index: AcUsDbxD5+5y4pIHQQihjtpG48imCwDpzfNQ From: "Bobby J. Hughes" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01C52FB9.BA7719F0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Rusty, =20 Thanks for the reply.=20 =20 =20 You've come to the wrong list :-) =20 =20 I am afraid of the other list so I will stick with this one. :) =20 Note that fuel system threads are one of our most popular, and everyone has an opinion. =20 =20 I think the fuel filter threads are Saginaw not NPT. =20 =20 if your pumps are really in the cockpit as they appear, there should be no chance for fuel to be boiling. With that in mind, you could probably skip the bypass around the regulator. =20 =20 Two reasons to keep the bypass. One. Vapor lock protection?????. It is a mandatory AD on the Egg Subi's after the two or three vapor lock problems they had last years.=20 Mark Steitle reported and I observed his engine would restart after running a tank dry and switching to the other with the bypass in place. It would not restart before this without releasing pressure ahead of the pump. =20 =20 lines are HUGE before the fuel manifold. =20 =20 Lines are based on Andair's recommendation for line sizes with their Fuel Selector. I need 235- 260 hp. Andairs data is for a Lyc or Cont. Can we use smaller lines with the 38-42lbs we are running? Not sure what the IO's run for fuel pressure. =20 somehow it seems wrong to have the two filters in parallel after the fuel manifold. I would normally expect to see one after each pump. All you're really doing is doubling the size of your filter, and these are pretty huge already. =20 =20 Twice in my life I have experienced partially clogged fuel filters in a car. Of course I was much younger and I am sure they was not serviced properly. The idea was to provide redundancy so either pump could use either (both) filters. Also a nice place for sensors. However, it added extra connections. :( =20 =20 Bobby =20 Education and recreation right? =20 =20 =20 =20 =20 =20 =20 =20 =20 =20 ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Russell Duffy Sent: Friday, March 18, 2005 4:51 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Fuel system Sketch Rev1 Need a sanity check. =20 =20 You've come to the wrong list :-)=20 =20 I don't see anything wrong with it, but I will make a couple comments. Note that fuel system threads are one of our most popular, and everyone has an opinion. =20 =20 - if your pumps are really in the cockpit as they appear, there should be no chance for fuel to be boiling. With that in mind, you could probably skip the bypass around the regulator. =20 =20 - lines are HUGE before the fuel manifold. =20 =20 - somehow it seems wrong to have the two filters in parallel after the fuel manifold. I would normally expect to see one after each pump. All you're really doing is doubling the size of your filter, and these are pretty huge already. =20 =20 Cheers, Rusty (gotta go do some lay-ups, and I wish I meant basketball) ------_=_NextPart_001_01C52FB9.BA7719F0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Rusty,
 
Thanks for the reply.
 
 
You've come to = the wrong=20 list :-) =20
 
I am afraid of the other list so I will stick = with this=20 one. :)
 
Note that fuel system threads = are one of=20 our most popular, and everyone has an=20 opinion.  
 
I think=20 the fuel filter threads are Saginaw not NPT. =20
 
 if your pumps are really in the cockpit as they = appear,=20 there should be no chance for fuel to be boiling.  With that = in mind,=20 you could probably skip the bypass around the=20 regulator.  
 
Two=20 reasons to keep the bypass. One. Vapor lock protection?????.  It is = a=20 mandatory AD on the Egg Subi's after the two or three vapor lock = problems they=20 had last years.
Mark=20 Steitle reported and I observed his engine would restart after running a = tank=20 dry and switching to the other with the bypass in place. It would not = restart=20 before this without releasing pressure ahead of the pump. =20
 
lines are HUGE before the fuel=20 manifold.  
 
Lines are based on Andair's = recommendation for=20 line sizes with their Fuel Selector.   I need 235- 260=20 hp. Andairs data is for a Lyc or Cont. Can we use smaller = lines with=20 the  38-42lbs we are running? Not sure what the IO's run for fuel=20 pressure.
 
somehow it seems wrong to have the two filters in = parallel after=20 the fuel manifold.  I would normally expect to see one after each=20 pump.   All you're really doing is doubling the size of = your=20 filter, and these are pretty huge already. =20
 
Twice=20 in my life I have experienced partially clogged fuel filters in a car. = Of course=20 I was much younger and I am sure they was not serviced properly. The = idea was to=20 provide redundancy so either pump could use either (both) filters. Also = a nice=20 place for sensors. However, it added extra connections. :( =20
&nbs= p;
Bobby
&nbs= p;
Education and recreation=20 right?
 
 
 
 
 
 
 
 
 
 

From: Rotary motors in aircraft=20 [mailto:flyrotary@lancaironline.net] On Behalf Of Russell=20 Duffy
Sent: Friday, March 18, 2005 4:51 PM
To: = Rotary motors=20 in aircraft
Subject: [FlyRotary] Re: Fuel system Sketch=20 Rev1

Need a sanity=20 check.  
 
You've come to = the wrong=20 list :-) 
 
I don't see anything wrong with it, but = I will=20 make a couple comments.  Note that fuel system threads are one of = our most=20 popular, and everyone has an = opinion.  
 
- if your pumps are really in the cockpit as = they=20 appear, there should be no chance for fuel to be boiling.  = With that=20 in mind, you could probably skip the bypass around the=20 regulator.  
 
- lines are HUGE before the fuel=20 manifold.  
 
- somehow it seems wrong to have the two = filters in=20 parallel after the fuel manifold.  I would normally expect to see = one after=20 each pump.   All you're really doing is doubling the size = of your=20 filter, and these are pretty huge already.  =
 
Cheers,
Rusty (gotta go do some lay-ups, and I wish I = meant=20 basketball)
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