X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from hrndva-omtalb.mail.rr.com ([71.74.56.122] verified) by logan.com (CommuniGate Pro SMTP 5.4.5) with ESMTP id 5544901 for flyrotary@lancaironline.net; Wed, 16 May 2012 08:07:29 -0400 Received-SPF: pass receiver=logan.com; client-ip=71.74.56.122; envelope-from=clouduster@austin.rr.com Return-Path: X-Authority-Analysis: v=2.0 cv=cssZYiEi c=1 sm=0 a=eTgKrshEm7xbomDJ3kHi1g==:17 a=409vFuCXsmoA:10 a=6-gXqasAkZ0A:10 a=05ChyHeVI94A:10 a=Ia-xEzejAAAA:8 a=-22OvGnge8kgd-AJqxsA:9 a=NDkWWzMnLbH0ocLmnxQA:7 a=wPNLvfGTeEIA:10 a=EzXvWhQp4_cA:10 a=_AEpC2T4IWGpjNVu:21 a=XUl4q52RYEQc-pjR:21 a=SSmOFEACAAAA:8 a=pedpZTtsAAAA:8 a=H1IrNqoBffeZ_kVKrmkA:9 a=hsBwo7FFVrGzaNVtm1IA:7 a=gKO2Hq4RSVkA:10 a=UiCQ7L4-1S4A:10 a=_W_S_7VecoQA:10 a=frz4AuCg-hUA:10 a=eJojReuL3h0A:10 a=10VxqpWPHxCt_tbz:21 a=FUsUuSNePbjuNXec:21 a=eTgKrshEm7xbomDJ3kHi1g==:117 X-Cloudmark-Score: 0 X-Originating-IP: 72.182.13.24 Received: from [72.182.13.24] ([72.182.13.24:58719] helo=DWHPC) by hrndva-oedge04.mail.rr.com (envelope-from ) (ecelerity 2.2.3.46 r()) with ESMTP id 9A/50-09134-D5893BF4; Wed, 16 May 2012 12:06:54 +0000 Message-ID: <05A6C1D7F1254EABA7B6024D21772C88@DWHPC> From: "Dennis Havarlah" To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary] Re: Thanks Tracy! Date: Wed, 16 May 2012 07:06:48 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_02DF_01CD3332.762F5FD0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6002.18197 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18463 This is a multi-part message in MIME format. ------=_NextPart_000_02DF_01CD3332.762F5FD0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I'm out on a long trip in the RV -7A for a few days. I'll get you more = info when I get back. Dennis H. ----- Original Message -----=20 From: Bill Bradburry=20 To: Rotary motors in aircraft=20 Sent: Tuesday, May 15, 2012 10:53 AM Subject: [FlyRotary] Re: Thanks Tracy! Dennis, =20 Are you climbing with WOT or do you throttle back to 24 inches? I am = at 55 feet here so my NA take off with ram effect can get to around = 30.5. I usually fly with WOT and control the engine power (and cooling) = with the MT prop. I dial it back to around 6K for climb after I reach a = safe altitude. =20 Your EGTs are similar to mine, maybe a little lower. My exhaust would = not be considered quiet. I had a Hushpower II on it but became = concerned that I might get an exhaust stoppage, so I just recently = removed it an installed a 4" dia DNA muffler. The sound is very = similar. Maybe a little louder, but I don't know for sure. I tried to = get a loudness record before I changed the muffler, but the decibel = meter I was using only went to 105 DB and that was not even close to = what the level was. :>( =20 I originally had a Performance prop on the plane with your same = dimensions (76 X 88), but I could not get more than 5350 static rpm with = it. I was afraid I would not be able to get airborne with no more HP = than that, so when the opportunity to get the MT prop at a "bargain" = popped up, I jumped on it! =20 When you say you go lean of peak, what does it peak at? How many = degrees lower do you go? 20 inches would mean you are at about 8500 ft = with WOT? What does your rpm run at under those conditions? I assume = leaning drops your rpm? From what rpm to what rpm? =20 I am trying to get some understanding on the "how to" for leaning the = rotary. I hope you and others as well chime in with their thoughts as = well. I know Tracy has economical running down to a science! :>) =20 Bill =20 -------------------------------------------------------------------------= ----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] = On Behalf Of Dennis Havarlah Sent: Tuesday, May 15, 2012 10:47 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Thanks Tracy! =20 I see EGTs around 1720 -1740 during takeoff and initial climb. During = climb at about 24 in hg I see EGTs 1700 or below. In cruise I go lean = of peak and at about 20 in hg I my EGTs are 1550 - 1630. My exhaust is = very quiet. This may cause my EGTs to be high. I've got approx. 350 = flight hours on the RV-7A with the Renesis and 2.85:1 RD1C. Prop is = Catto 88 in pitch and 76 in dia. =20 Dennis H. =20 ------=_NextPart_000_02DF_01CD3332.762F5FD0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I'm out on a long trip in the RV = -7A for a few=20 days.  I'll get you more info when I get back.
 
Dennis H.
----- Original Message -----
From:=20 Bill=20 Bradburry
Sent: Tuesday, May 15, 2012 = 10:53=20 AM
Subject: [FlyRotary] Re: Thanks = Tracy!

Dennis,

 

Are you = climbing with=20 WOT or do you throttle back to 24 inches?  I am at 55 feet here = so my NA=20 take off with ram effect can get to around 30.5.  I usually fly = with WOT=20 and control the engine power (and cooling) with the MT prop.  I = dial it=20 back to around 6K for climb after I reach a safe=20 altitude.

 

Your EGTs = are similar=20 to mine, maybe a little lower.  My exhaust would not be = considered=20 quiet.  I had a Hushpower II on it but became concerned that I = might get=20 an exhaust stoppage, so I just recently removed it an installed a 4=94 = dia DNA=20 muffler.  The sound is very similar.  Maybe a little louder, = but I=20 don=92t know for sure.  I tried to get a loudness record before I = changed=20 the muffler, but the decibel meter I was using only went to 105 DB and = that=20 was not even close to what the level was. =20 :>(

 

I = originally had a=20 Performance prop on the plane with your same dimensions (76 X 88), but = I could=20 not get more than 5350 static rpm with it.  I was afraid I would = not be=20 able to get airborne with no more HP than that, so when the = opportunity to get=20 the MT prop at a =93bargain=94 popped up, I jumped on=20 it!

 

When you = say you go=20 lean of peak, what does it peak at?  How many degrees lower do = you=20 go?  20 inches would mean you are at about 8500 ft with = WOT?  What=20 does your rpm run at under those conditions?  I assume leaning = drops your=20 rpm?  From what rpm to what rpm?

 

I am trying = to get=20 some understanding on the =93how to=94 for leaning the rotary.  I = hope you=20 and others as well chime in with their thoughts as well.  I know=20 Tracy has=20 economical running down to a science!  =20 :>)

 

Bill

 

From:=20 Rotary motors in aircraft = [mailto:flyrotary@lancaironline.net] On=20 Behalf Of Dennis Havarlah
Sent: Tuesday, May 15, 2012 = 10:47=20 AM
To: = Rotary motors in aircraft
Subject: [FlyRotary] Re: Thanks = Tracy!

 

I see EGTs around 1720 = -1740=20 during takeoff and initial climb.  During climb at about 24 in hg = I see=20 EGTs 1700 or below.  In cruise I go lean of peak and at about 20 = in hg I=20 my EGTs are 1550 - 1630.  My exhaust is very quiet.  This = may cause=20 my EGTs to be high.  I've got approx. 350 flight hours on the = RV-7A with=20 the Renesis and 2.85:1 RD1C.   Prop is Catto 88 in pitch and = 76 in=20 dia.

 

Dennis=20 H.

 

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