Return-Path: Received: from [199.185.220.240] (HELO priv-edtnes57.telusplanet.net) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2908864 for flyrotary@lancaironline.net; Mon, 29 Dec 2003 00:23:23 -0500 Received: from Endurance ([207.194.22.175]) by priv-edtnes57.telusplanet.net (InterMail vM.6.00.05.02 201-2115-109-103-20031105) with SMTP id <20031229052321.CQQC17869.priv-edtnes57.telusplanet.net@Endurance> for ; Sun, 28 Dec 2003 22:23:21 -0700 From: "Haywire" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: Fuel Coolers Date: Sun, 28 Dec 2003 21:23:14 -0800 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0046_01C3CD88.CDBB33F0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) In-reply-to: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_0046_01C3CD88.CDBB33F0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit My shroud is fed by a 2" dia scatt hose that route air from a small NACA scope (about the same size as on the side of an RV aircraft) the duct opening is under the cowl about 2/3 of the way back from the front. I concluded that during high power climb would be when I would need the cooling air the worst. Seems to work for me. Interesting, I have had two power out events - but, neither due to fuel/vapor lock {:>). INterestingly, its not high power that is generally the problem. At high power, you generally do not recirculate much fuel, much more of it is being consumed and replaced with new fresh cool fuel. Its after you throttle back after a hard climb and stay a lower airspeeds like in the pattern, then much more fuel is recirculated back to the headertank (and bringing with it the heat build up). Thanks Ed; I'll order one of Van's pre-made NACA ducts tonight as this will eliminate downtime for fibreglass work, and tomorrow I'll phone a few rad shops. Do you usually run with both FI pumps on while climbing? As I didn't have this problem to this extent previously, it reaffirms your theory that most fuel is consumed at full power with less being recirculated when a single pump is used, but with both pumps running, I still had allot of fuel being recirculated, while picking up full power heat. It seems that running with both pumps on for extra safety may in fact, have contributed to the problem? Just another theory. S. Todd Bartrim Turbo 13B RV-9Endurance C-FSTB http://www3.telus.net/haywire/RV-9/C-FSTB.htm "Whatever you vividly imagine, Ardently desire, Sincerely believe in, Enthusiastically act upon, Must inevitably come to pass". ------=_NextPart_000_0046_01C3CD88.CDBB33F0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
My = shroud is fed by=20 a 2" dia scatt hose that route air from a small NACA scope (about the = same size=20 as on the side of an RV aircraft) the duct opening is under the cowl = about 2/3=20 of the way back from the front.  I concluded that during high power = climb=20 would be when I would need the cooling air the worst.  Seems to = work for=20 me.  Interesting, I have had two power out events - but, neither = due to=20 fuel/vapor lock {:>).  INterestingly, its not high power that is = generally the problem.  At high power, you generally do not = recirculate=20 much fuel, much more of it is being consumed and replaced with new fresh = cool=20 fuel.  Its after you throttle back after a hard climb and stay a = lower=20 airspeeds like in the pattern, then much more fuel is recirculated back = to the=20 headertank (and bringing with it the heat build up).  =20
 
Thanks=20 Ed;
    I'll order one of Van's pre-made NACA ducts = tonight as this=20 will eliminate downtime for fibreglass work, and tomorrow I'll phone a = few rad=20 shops.
    Do you usually run with both FI pumps on = while=20 climbing? As I didn't have this problem to this extent previously,=20 it reaffirms your theory that most fuel is consumed at full power = with less=20 being recirculated when a single pump is used, but with both pumps = running, I=20 still had allot of fuel being recirculated, while picking up full power=20 heat.
    It seems that running with both pumps on for = extra safety=20 may in fact, have contributed to the problem?  Just another=20 theory.
 

S. Todd Bartrim
Turbo 13B = RV-9Endurance
C-FSTB
http://www3.telus.net/haywire/RV-9/C-FSTB.htm

=   =20 "Whatever you vividly imagine, Ardently desire, Sincerely believe in,=20 Enthusiastically act upon, Must inevitably come to=20 pass".

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