Return-Path: Received: from [24.25.9.102] (HELO ms-smtp-03-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2b3) with ESMTP id 3223101 for flyrotary@lancaironline.net; Sun, 09 May 2004 12:07:18 -0400 Received: from EDWARD (clt25-78-058.carolina.rr.com [24.25.78.58]) by ms-smtp-03-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i49G7Fs2002090 for ; Sun, 9 May 2004 12:07:16 -0400 (EDT) Message-ID: <000a01c435df$b6365650$2402a8c0@EDWARD> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: What should you expect was : first flight Tracy's old prop. Date: Sun, 9 May 2004 12:07:22 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0007_01C435BE.2EEB7DE0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0007_01C435BE.2EEB7DE0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageYes, Dave, I did fly with Jim's prop on one occasion several = years ago. As best I recall, I was down a bit on the top end rpm wise, = Only pulling around 5800 rpm at WOT. The static on the other hand was = right at 5100 rpm (down 100 rpm) from my prop. It did seem to add to my = climb rate a bit. I would say you should get 5000 rpm static with his = prop and if you are not then some tuning is indicated. However, you = have a turbo which might cause the static to drop a bit (back pressure = on the exhaust flow) if you are not in a boost situation. But in any = case, with that size prop I think 5000-5200 is a target to shoot for. = FWIW Ed Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC ----- Original Message -----=20 From: DaveLeonard=20 To: Rotary motors in aircraft=20 Sent: Sunday, May 09, 2004 12:00 PM Subject: [FlyRotary] Re: What should you expect was : first flight = Tracy's old prop. Speaking of comparisons, Ed, I am using the 68/74 prop that Jim Mossur = sold me. I know that you had it on your plane at one time. Do you by = chance recall what your static RPM was with my prop? I am only getting = 4600 at 30"MAP which I fear is going to lead me to needing a fair amount = of boost just to match n.a. performance. But maybe those extra 2" of = pitch are slowing it down on the ground and it will be just right with = some boost (yea right :-) Dave Leonard Since Tracy and I had identical props by the same maker 68/72 and = the same model engine 90 Turbo II, both with high compression rotors, we = were about as identical as could get on engine/prop. Oh, yes, our = intake systems were very similar although not identical. We both would = get a nominal 5200 rpm static (on cold mornings due to the EDDIE effect = my static would go as high as 5600-5800 rpm). In my 120 mph (TAS) WOT = climbout I normally would get from 5600-5800 (depending on OAT). So if = you are not getting at least 5000 static, you have some tuning to do. ------=_NextPart_000_0007_01C435BE.2EEB7DE0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Yes, Dave, I did fly with Jim's prop on = one=20 occasion several years ago.  As best I recall, I was down a bit on = the top=20 end rpm wise, Only pulling around 5800 rpm at WOT.  The static on = the other=20 hand was right at 5100 rpm (down 100 rpm) from my prop.  It did = seem to add=20 to my climb rate a bit.  I would say you should get 5000 rpm static = with=20 his prop and if you are not then some tuning is indicated.  = However, you=20 have a turbo which might cause the static to drop a bit (back pressure = on the=20 exhaust flow) if you are not in a boost situation. But in any case, with = that=20 size prop I think 5000-5200 is a target to shoot for.  = FWIW
 
Ed
 
Ed Anderson
RV-6A N494BW Rotary=20 Powered
Matthews, NC
----- Original Message -----
From:=20 DaveLeonard=20
Sent: Sunday, May 09, 2004 = 12:00 PM
Subject: [FlyRotary] Re: What = should you=20 expect was : first flight Tracy's old prop.


Speaking of comparisons, Ed, I am using the 68/74 prop = that Jim=20 Mossur sold me.   I know that you had it on your plane at = one=20 time.  Do you by chance recall what your static RPM was with my=20 prop?  I am only getting 4600 at 30"MAP which I fear is going to = lead me=20 to needing a fair amount of boost just to match n.a. = performance.  But=20 maybe those extra 2" of pitch are slowing it down on the ground and it = will be=20 just right with some boost  (yea right  = :-)
 
Dave=20 Leonard
 
 
  Since Tracy and I had identical props by the same maker 68/72 = and the=20 same model engine 90 Turbo II, both with high compression rotors, we = were=20 about as identical as could get on engine/prop.  Oh, yes, our = intake=20 systems were very similar although not identical.  We both would = get a=20 nominal 5200 rpm static (on cold mornings due to the EDDIE effect my = static=20 would go as high as 5600-5800 rpm).    In my 120 mph (TAS) = WOT=20 climbout I normally would get from 5600-5800 (depending on OAT).  = So if=20 you are not getting at least 5000 static, you have some tuning to=20 do.

 

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