Return-Path: <13brv3@bellsouth.net> Received: from imf19aec.mail.bellsouth.net ([205.152.59.67] verified) by logan.com (CommuniGate Pro SMTP 4.2) with ESMTP id 380760 for flyrotary@lancaironline.net; Fri, 27 Aug 2004 09:04:47 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.67; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf19aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040827130416.CIGI1789.imf19aec.mail.bellsouth.net@rd> for ; Fri, 27 Aug 2004 09:04:16 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Rusty's intake again Date: Fri, 27 Aug 2004 08:04:31 -0500 Message-ID: <005101c48c36$64a0d100$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0052_01C48C0C.7BCAC900" 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 V6.00.2800.1409 This is a multi-part message in MIME format. ------=_NextPart_000_0052_01C48C0C.7BCAC900 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Is the engine 'seeing' a LONG intake tube at WOT? In other words, when = the TB is WOT the engine is seeing an intake tube length of 20" - 24" (from looking at the picture) due to the CEET tubing instead of 12" - 14" = (from the rotor to the TB). If the intake is functioning as LONG then the = engine will not rev. Rotaries are sensitive to intake length. Try a flight = with only the TB and air horns.=20 Hi Ken, I've certainly proven that the engine doesn't like all the extra tubing. = I suspect it's more a matter of the small size, and turbulent nature of = the SCEET tubing more than the length. Either way, it's outa here. The = last test I posted was a flight with the TB and airhorns opened to the inside = of the cowl, and it was much more powerful than with all the plumbing = hooked up. =20 I'm still considering what to do for the next scoop, and I might just = put some hours on the plane this weekend with the TB open to the inside of = the cowl while I decide. =20 I really think the best performance option will probably be to build an airbox that seals to the top cowl, then add a scoop on top that feeds = the box. Trying to feed the intake with the radiator duct creates so many = tight turns, and restrictions that it can never be ideal. Also, the new = monster prop is probably not doing me any favors with airflow in the area of the normal RV cowl inlets. Fortunately, I still have plenty of water = cooling, so it could be worse. =20 Thanks, Rusty (still catching up) =20 ------=_NextPart_000_0052_01C48C0C.7BCAC900 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Is the engine 'seeing' a LONG intake tube at WOT?  In other = words, when=20 the TB is WOT the engine is seeing an intake tube length of 20" - 24" = (from=20 looking at the picture) due to the CEET tubing instead of 12" - 14" = (from the=20 rotor to the TB).  If the intake is functioning as LONG then the = engine=20 will not rev.  Rotaries are sensitive to intake length.  Try a = flight=20 with only the TB and air horns. 

Hi=20 Ken,

I've certainly=20 proven that the engine doesn't like all the extra tubing.  I = suspect it's=20 more a matter of the small size, and turbulent nature of the SCEET = tubing more=20 than the length.  Either way, it's outa here.  The last test I = posted=20 was a flight with the TB and airhorns opened to the inside of the cowl, = and it=20 was much more powerful than with all the plumbing hooked=20 up.   

I'm still=20 considering what to do for the next scoop, and I might just put some = hours on=20 the plane this weekend with the TB open to the inside of the cowl while = I=20 decide. 

I = really think=20 the best performance option will probably be to build an airbox that = seals to=20 the top cowl, then add a scoop on top that feeds the box.  = Trying to=20 feed the intake with the radiator duct creates so many tight turns, and=20 restrictions that it can never be ideal.  Also, the new monster = prop is=20 probably not doing me any favors with airflow in the area of the normal = RV cowl=20 inlets.  Fortunately, I still have plenty of water cooling, so it = could be=20 worse. 

Thanks,
Rusty (still=20 catching up)

 

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