X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: <13brv3@bellsouth.net> Received: from imf18aec.mail.bellsouth.net ([205.152.59.66] verified) by logan.com (CommuniGate Pro SMTP 4.3.4) with ESMTP id 986359 for flyrotary@lancaironline.net; Mon, 06 Jun 2005 15:07:32 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.66; envelope-from=13brv3@bellsouth.net Received: from ibm59aec.bellsouth.net ([65.6.194.9]) by imf18aec.mail.bellsouth.net with ESMTP id <20050606190646.PTVV16444.imf18aec.mail.bellsouth.net@ibm59aec.bellsouth.net> for ; Mon, 6 Jun 2005 15:06:46 -0400 Received: from rd ([65.6.194.9]) by ibm59aec.bellsouth.net with ESMTP id <20050606190645.MXDK5167.ibm59aec.bellsouth.net@rd> for ; Mon, 6 Jun 2005 15:06:45 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: EC2 problems - solved / rotary risks Date: Mon, 6 Jun 2005 14:06:43 -0500 Message-ID: <010e01c56aca$e25c8760$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_010F_01C56AA0.F9867F60" 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_010F_01C56AA0.F9867F60 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I like to see some expertise put into adding backup ignition & fuel = delivery systems. Could a carburetor with its own fuel feed double as a throttle body, and could a magneto be used to run the ignition? John=20 =20 Funny, but I've been thinking the same thing about the carb. It just = seems like a natural way to have a backup fuel device, though transitioning = from one to the other on the fly for testing could be entertaining :-) The = only thing you'd have to add is a low pressure fuel pump for the carb. You = could even look at this as something to use in the event of an alternator = failure, since it would draw less current than the EFI system. =20 =20 As for ignition, I haven't worked that part out yet. The temptation = would be to try to have two high tension wires connected to the leading plugs, = but what effect that would have on the system that wasn't on would be the question. I haven't looked into it that closely. =20 =20 I actually told someone this morning about the long time dream of having = a centerline thrust twin, where each engine would actually have enough = power to fly the plane. The original idea was for two Rotax engines, because = at the time, they were cheap, light, and reliability wouldn't be so much of = an issue. Now, the dream centers around two single rotor engines, but = you'd need the aluminum housings to make it worthwhile for weight. This would = be the ultimate in redundancy, and you wouldn't worry about putting two of everything on each engine. Most of these engine computers, and EFI = pumps, etc are so reliable as to almost make it a waste to have a spare. =20 =20 Cheers, Rusty (dream over, back to reality) =20 ------=_NextPart_000_010F_01C56AA0.F9867F60 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
I like to see some expertise put = into adding=20 backup ignition & fuel delivery systems. Could a carburetor with its own fuel feed = double as a=20 throttle body, and could a magneto be used to run the = ignition?
John 
 
Funny, but I've been thinking the same thing about the = carb. =20 It just seems like a natural way to have a backup fuel device, = though=20 transitioning from one to the other on the fly for testing could be = entertaining=20 :-)  The only thing you'd have to add is a low pressure fuel pump = for the=20 carb.  You could even look at this as something to use in the event = of an=20 alternator failure, since it would draw less current than the EFI=20 system.  
 
As for ignition, I haven't worked that part out=20 yet.  The temptation would be to try to have two high = tension=20 wires connected to the leading plugs, but what effect that would = have on=20 the system that wasn't on would be the question.  I haven't = looked=20 into it that closely.  
 
I actually told someone this morning about the long=20 time dream of having a centerline thrust twin, where each engine = would=20 actually have enough power to fly the plane.  The original idea was = for two Rotax engines,  because at the time, they were = cheap,=20 light, and reliability wouldn't be so much of an issue.  Now, the = dream=20 centers around two single rotor engines, but you'd need the aluminum = housings to=20 make it worthwhile for weight.  This would be the ultimate=20 in redundancy, and you wouldn't worry about putting two of = everything on=20 each engine.  Most of these engine computers, and EFI pumps, etc = are so=20 reliable as to almost make it a waste to have a=20 spare.    
 
Cheers,
Rusty (dream over, back to = reality)   
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