X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: <13brv3@bellsouth.net> Received: from imf20aec.mail.bellsouth.net ([205.152.59.68] verified) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 940825 for flyrotary@lancaironline.net; Wed, 11 May 2005 23:57:51 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.68; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf20aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050512035705.GNQM13146.imf20aec.mail.bellsouth.net@rd> for ; Wed, 11 May 2005 23:57:05 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: silly intake idea of the day Date: Wed, 11 May 2005 22:57:24 -0500 Message-ID: <000501c556a6$b47232b0$04000100@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0006_01C5567C.CB9C2AB0" 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_0006_01C5567C.CB9C2AB0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Hi Rusty, seems to me the whole idea of building the runners and horns in a plenum is shooting for 'tuned induction' .With this idea you have just screwed any chance of achieving tuned length. Ram air in the inlet at 100kt {V climb} is good for less than 1/4 psi at best, the tuned length has much more benefit for volumetric efficiency than 1/4 psi. Put a filter on the plenum and as far from it as will fit under the cowl. FWIW, Dave McC { 6.5b in gestation} That's certainly a good point Dave. Ernest's idea should work better than mine, but the box is going to probably be taller than I have room for. Given the choice, I would rather have the power than a filter, since realistically speaking, there's no way I could ever wear this engine out with the amount of flying I (don't) do. I'm trying very hard to convince myself to just fly the plane, and leave it alone. It's not like I need more power, since I'm at least in the 2500 fpm climb, and 200 mph range. It's running well, and cooling too well. When the UPS guy arrives tomorrow, I'll even have everything I need to actually put together a single rotor engine, so I should really leave well enough alone for now on the RV-3, and get to work on the single rotor projects. Wish me luck resisting a supercharger :-) Cheers, Rusty ------=_NextPart_000_0006_01C5567C.CB9C2AB0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Hi Rusty, seems to me the whole idea of building the runners and = horns in a=20 plenum is shooting for 'tuned induction' .With this idea you have just = screwed=20 any chance of achieving tuned length. Ram air in the inlet at 100kt {V = climb} is=20 good for less than 1/4 psi at best, the tuned length has much more = benefit for=20 volumetric efficiency than 1/4 psi. Put a filter on the plenum and as = far from=20 it as will fit under the cowl. FWIW, Dave McC { 6.5b in gestation} 
 
That's=20 certainly a good point Dave.  Ernest's idea should work better = than=20 mine, but the box is going to probably be taller than I have room=20 for.  Given the choice, I would rather have the = power than a=20 filter, since realistically speaking, there's no way I could ever wear = this=20 engine out with the amount of flying I (don't) = do. 
 
I'm trying=20 very hard to convince myself to just fly the plane, and leave it = alone. =20 It's not like I need more power, since I'm at least in the 2500 fpm = climb, and=20 200 mph range.  It's running well, and cooling too well.  When = the UPS=20 guy arrives tomorrow, I'll even have everything I need to actually put = together=20 a single rotor engine, so I should really leave well enough alone for = now on the=20 RV-3, and get to work on the single rotor projects.  =
 
Wish me luck=20 resisting a supercharger :-)
 
Cheers,
Rusty
 
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