X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.121] verified) by logan.com (CommuniGate Pro SMTP 5.3.9) with ESMTP id 4464070 for flyrotary@lancaironline.net; Sun, 12 Sep 2010 13:05:23 -0400 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.121; envelope-from=eanderson@carolina.rr.com Return-Path: X-Authority-Analysis: v=1.1 cv=p2+AJtORPCqgiIb1GLnEzM38JG/9906BinLiWeI6YUU= c=1 sm=0 a=9f8lwO49qKIA:10 a=rPkcCx1H5rrOSfN0dPC7kw==:17 a=3oc9M9_CAAAA:8 a=zMXbLF2piWc0oz8f5bIA:9 a=ugW3tHAjkqfN6yenMCMA:7 a=70FgDoYaD8aE2LVFBUJRWb9MzFsA:4 a=wPNLvfGTeEIA:10 a=U8Ie8EnqySEA:10 a=Ia-xEzejAAAA:8 a=wNb4pUUhAQDjN1bj7SwA:9 a=pfRf3c8QjzN6QOXCXYIA:7 a=ajAmA2fCviwT_2anWLpKwahFcZcA:4 a=EzXvWhQp4_cA:10 a=rPkcCx1H5rrOSfN0dPC7kw==:117 X-Cloudmark-Score: 0 X-Originating-IP: 174.110.167.5 Received: from [174.110.167.5] ([174.110.167.5:62920] helo=EdPC) by cdptpa-oedge02.mail.rr.com (envelope-from ) (ecelerity 2.2.2.39 r()) with ESMTP id 44/42-06845-E280D8C4; Sun, 12 Sep 2010 17:04:46 +0000 Message-ID: <28CA3E9AA35941FAB439C88A093957DB@EdPC> From: "Ed Anderson" To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary] Re: First flight Date: Sun, 12 Sep 2010 13:04:46 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0033_01CB527B.132F40B0" X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 This is a multi-part message in MIME format. ------=_NextPart_000_0033_01CB527B.132F40B0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Brian, If using the 2.85:1 then 4800 rpm is definitely on the low side, = Tracy was referring to his rpm of 4800 when using the 2.71:1. With my = old 13B and a 2.85:1, I get 6000 rpm static with a 75x88 prop, so I = would say you need to be above 5500 rpm. I think you stated you reached = that with the cowl off.=20 Check and make certain that there are not any intake hoses to/from the = throttle body that can collapse or close/clamp down. I know of one = situation where an air filter apparently cause just enough lower = pressure in an intake to cause the intake hose the builder was using = from TB to manifold to crush and restrict air flow. Once the filter = was removed the problem would clear up - it took longer than you might = think to discover that was the problem. So if you can get 5500 rpm without cowl and only 4800 with cowl/filter - = something is a miss. At 4800 rpm 14.7:1 air fuel ratio, you are making around 115 Hp, = assuming you have it rich (12.65:1) then its around 130 HP. I flew on = around 130 Hp for the first year or so it took me to get my problem = identified and fixed. The RV will fly fine (if a little lacking in = performance on take off and climb) on 130 HP, my top speed was 186 MPH - = not steriling for an RV but better than most single engine certified by = far. Go get'er done Ed From: Bktrub@aol.com=20 Sent: Sunday, September 12, 2010 12:00 PM To: Rotary motors in aircraft=20 Subject: [FlyRotary] Re: First flight I'm using the 2.85 to one, I'll try some tuning first before I remove = the air filter. It's easier to turn a know than to remove the air = filter. I'm pretty sure I'm running way too rich.=20 Brian Trubee ------=_NextPart_000_0033_01CB527B.132F40B0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Brian, If using the 2.85:1 then 4800 rpm is = definitely on the=20 low side, Tracy was referring to his rpm of 4800 when using the = 2.71:1. =20 With my old 13B and a 2.85:1, I get 6000 rpm static with a 75x88 prop, = so I=20 would say you need to be above 5500 rpm.  I think you stated you = reached=20 that with the cowl off. 
 
 Check and make certain that there are not any = intake=20 hoses to/from the throttle body that can collapse or close/clamp = down.  I=20 know of one situation where an air filter apparently cause just enough = lower=20 pressure in an intake to cause the intake hose the builder was using = from TB to=20 manifold to crush and restrict air flow.   Once the filter was = removed=20 the problem would clear up - it took longer than you might think to = discover=20 that was the problem.
 
So if you can get 5500 rpm without cowl and only = 4800 with=20 cowl/filter - something is a miss.
 
At 4800 rpm 14.7:1 air fuel ratio, you are making=20 around   115 Hp,   assuming you have it rich = (12.65:1) then=20 its around 130 HP.  I flew on around 130 Hp for the first year or = so it=20 took me to get my problem identified and fixed.  The RV will fly = fine (if a=20 little lacking in performance on take off and climb) on 130 HP, my top = speed was=20 186 MPH - not steriling for an RV but better than most single engine = certified=20 by far.
 
Go get'er done
 
Ed

From: Bktrub@aol.com
Sent: Sunday, September 12, 2010 12:00 PM
Subject: [FlyRotary] Re: First flight

I'm using the 2.85 to one, I'll try some tuning first before I = remove the=20 air filter. It's easier to turn a know than to remove the air filter. = I'm pretty=20 sure I'm running way too rich.
 
Brian Trubee
 ------=_NextPart_000_0033_01CB527B.132F40B0--