Return-Path: <13brv3@bellsouth.net> Received: from imf21aec.mail.bellsouth.net ([205.152.59.69] verified) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP id 816097 for flyrotary@lancaironline.net; Tue, 22 Mar 2005 15:26:08 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.69; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf21aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050322202519.OVSZ2063.imf21aec.mail.bellsouth.net@rd> for ; Tue, 22 Mar 2005 15:25:19 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] fuel injector size, and redrive losses Date: Tue, 22 Mar 2005 14:25:28 -0600 Message-ID: <000201c52f1d$49cbfeb0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0003_01C52EEA.FF318EB0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 This is a multi-part message in MIME format. ------=_NextPart_000_0003_01C52EEA.FF318EB0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable RC Engineering's calcs show that you are good to 302 HP at 43 psi fuel pressure, .50 BSFC, and 100% duty cycle. Of course you can't run the injectors at 100% (except maybe briefly like a drag race, not applicable = to aircraft). So at 80% duty cycle the 38 lb injectors should be good for = 242 HP. Enjoy your idle!!! Your injectors are big enough unless you P-Port = and turn at least 8000 RPM. Hi Ken, =20 RC Engineering's calc shows the same as the fuel calculator that I = posted the other day. Four 38 lb/hr injectors, at 80% duty cycle, .55 BSFC, = should be good for about 220 HP at the flywheel. I imagine that will be enough = for the current engine, but not by a wide margin. I plan to run this engine = as high as 8000 if I can, though I'll be amazed if I can get beyond 7500. Don't need no stinkin' P-Port for these rpms :-) =20 On the fuel spreadsheet that I posted (stolen) the other day, it gives a = HP figure for the flywheel, and rear wheels. The estimate for the power = loss due to a manual trans and diff is 15% on this spreadsheet. Anyone know = what this amounts to for our redrive, and prop? =20 =20 Cheers, Rusty (hoping Ed out types me) =20 =20 ------=_NextPart_000_0003_01C52EEA.FF318EB0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
RC Engineering's calcs show that you are good to 302 HP at 43 psi = fuel=20 pressure, .50 BSFC, and 100% duty cycle.  Of course you can't run = the=20 injectors at 100% (except maybe briefly like a drag race, not applicable = to=20 aircraft).  So at 80% duty cycle the 38 lb injectors should be good = for 242=20 HP.  Enjoy your idle!!!  Your injectors are big enough unless = you=20 P-Port and turn at least 8000 RPM.

Hi=20 Ken,
 
RC=20 Engineering's calc shows the same as the fuel calculator that I=20 posted the other day.  Four 38 lb/hr injectors, at 80% duty = cycle, .55=20 BSFC, should be good for about 220 HP at the flywheel.  I = imagine=20 that will be enough for the current engine, but not by a wide=20 margin.  I plan to run this engine as high as 8000 if I can, though = I'll be=20 amazed if I can get beyond 7500.  Don't need no stinkin' P-Port for = these=20 rpms :-)
 
On the fuel=20 spreadsheet that I posted (stolen) the other day, it gives a HP = figure for=20 the flywheel, and rear wheels.  The estimate for the power = loss due to=20 a manual trans and diff is 15% on this = spreadsheet.  Anyone know=20 what this amounts to for our redrive, and=20 prop?  
 
Cheers,
Rusty (hoping=20 Ed out types me)
 
   
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