Return-Path: <13brv3@bellsouth.net> Received: from imf17aec.mail.bellsouth.net ([205.152.59.65] verified) by logan.com (CommuniGate Pro SMTP 4.2) with ESMTP id 377207 for flyrotary@lancaironline.net; Tue, 24 Aug 2004 21:59:52 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.65; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf17aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040825015920.YSYF1758.imf17aec.mail.bellsouth.net@rd> for ; Tue, 24 Aug 2004 21:59:20 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "Flyrotary List" Subject: Rev-3 intake tests Date: Tue, 24 Aug 2004 20:59:27 -0500 Message-ID: <01b501c48a47$26e290b0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_01B6_01C48A1D.3E0C88B0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 This is a multi-part message in MIME format. ------=_NextPart_000_01B6_01C48A1D.3E0C88B0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Greetings, =20 Below is the log entry for today. As you can see, the inlet ducting = does in fact cause a significant problem. Smoothing the airflow into the TB = inlets seems to help as expected, and will be built into the next airbox. =20 =20 In retrospect, I've had to improve this intake inlet ducting every step = of the way, every time more power has been possible. I can look back and clearly see how "good enough" for one rev, just wasn't good enough for = the next. Makes the turbo guys seem pretty lazy :-) =20 Cheers, Rusty (butt much cooler today) =20 =20 =20 8-24-04 =20 Re-installed the muffler now that I have about 20 inches of tailpipe = welded in place. This seems to make a big difference in the cockpit noise = level, not to mention the seat temp. It if gets rid of the exhaust smell, it's work will be complete. =20 =20 Did a few tests with the intake, and there's hope. I ran the plane full throttle to get some static rpm's and MAP readings. =20 =20 Normal setup with all intake tubing connected- RPM 5500, MAP 27.0 No inlet tubing connected to the TB, just the 1.75" straight flanges- = RPM 5750, MAP 27.1 No inlet tubing, but with short air horn on TB in place of flanges- RPM 5820, MAP 27.9 =20 From the above tests, it's pretty clear that there's a lot of = improvement to be made in my inlet ducting. I have to imagine that the results could possibly be better if the prop blast wasn't blowing perpendicular to the = TB inlets. Now I just have to come up with a better inlet scheme, and = things should be much better. Not sure what that will be yet. =20 ------=_NextPart_000_01B6_01C48A1D.3E0C88B0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Greetings,

 

Below is the log entry = for=20 today.  As you can see, the inlet ducting does in fact cause a = significant=20 problem.  Smoothing the airflow into the TB inlets seems to help as = expected, and will be built into the next airbox.  =

 

In retrospect, I've had = to improve=20 this intake inlet ducting every step of the way, every time = more=20 power has been possible.  I can look back and clearly see = how=20 "good enough" for one rev, just wasn't good enough for the = next. =20 Makes the turbo guys seem pretty lazy :-)

 

Cheers,

Rusty (butt much cooler=20 today)

 

 

 

8-24-04

 

Re-installed the muffler now that I have about = 20 inches=20 of tailpipe welded in place.  = This=20 seems to make a big difference in the cockpit noise level, not to = mention the=20 seat temp.  It if gets rid = of the=20 exhaust smell, it’s work will be complete. =20

 

Did a few tests with the intake, and = there’s hope.  I ran the plane full throttle = to get=20 some static rpm’s and MAP readings. =20

 

Normal setup with all intake tubing connected-  RPM 5500, MAP 27.0

No inlet tubing connected to the TB, just the 1.75” = straight=20 flanges-  RPM 5750,  MAP 27.1

No inlet tubing, but with short air horn on TB in place of = flanges- RPM=20 5820,  MAP 27.9

 

From the above tests, it’s pretty clear = that there’s a=20 lot of improvement to be made in my inlet ducting.  I have to imagine that the = results could=20 possibly be better if the prop blast wasn’t blowing perpendicular = to the TB=20 inlets.  Now I just have = to come up=20 with a better inlet scheme, and things should be much better.  Not sure what that will be = yet.    

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