X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 15 Aug 2011 07:40:59 -0400 Message-ID: X-Original-Return-Path: Received: from elasmtp-junco.atl.sa.earthlink.net ([209.86.89.63] verified) by logan.com (CommuniGate Pro SMTP 5.4.1) with ESMTP id 5092066 for lml@lancaironline.net; Sun, 14 Aug 2011 22:28:40 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.63; envelope-from=colyncase@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=PAWLO0uI4le1/6aYNk4aUSeCeE5B/xVLItDvRM3qtDu7k4CIRD8cOpXf/bELCTtw; h=Received:Subject:Mime-Version:Content-Type:From:In-Reply-To:Date:Cc:Message-Id:References:To:X-Mailer:X-ELNK-Trace:X-Originating-IP; Received: from [70.16.215.13] (helo=[192.168.1.24]) by elasmtp-junco.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1QsmuM-0007Ww-9d; Sun, 14 Aug 2011 22:28:06 -0400 Subject: Re: [LML] FW: [LML] What are your numbers?? Mime-Version: 1.0 (Apple Message framework v1084) Content-Type: multipart/alternative; boundary=Apple-Mail-534-60636937 From: Colyn Case In-Reply-To: <342BC12F-DA34-4886-A9CF-BDACD95579AB@earthlink.net> X-Original-Date: Sun, 14 Aug 2011 22:28:05 -0400 X-Original-Cc: "Lancair Mailing List" X-Original-Message-Id: <1C9511C2-683B-4220-A1B2-274BA6A20D39@earthlink.net> References: <342BC12F-DA34-4886-A9CF-BDACD95579AB@earthlink.net> X-Original-To: Colyn Case X-Mailer: Apple Mail (2.1084) X-ELNK-Trace: 63d5d3452847f8b1d6dd28457998182d7e972de0d01da940a32b6cb3ef37a6afc678d1a03bde75f4350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 70.16.215.13 --Apple-Mail-534-60636937 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 I just saw APS has collected the pelican's perch articles into a .pdf = here: http://www.advancedpilot.com/downloads/prep.pdf On Aug 14, 2011, at 9:05 PM, Colyn Case wrote: > the old saw is "it's not how hard you run it. it's how you run it = hard." > The thing you are trying to avoid is high internal peak pressure. > That is more about mixture and spark timing than MAP. > I would not hesitate to run 32 inches IF I knew I was well lean of = peak AND both TIT's were below 1650 AND all CHT's below 380. > If you have a 7.5:1 compression engine, that should give you a fuel = flow of 17.6 gph or so, depending on > which limit you hit first. >=20 > If you haven't read this series it's well worth it. See articles = 63,64, 65, 66 > http://www.avweb.com/news/pelican/182146-1.html >=20 > ...and then take the APS course. worth every penny. there's a = cheaper online-only one if you don't really want to see the computerized = test cell in action and a lot of good live interaction. > http://www.advancedpilot.com/ =20 >=20 > On Aug 14, 2011, at 9:27 AM, = wrote: >=20 >> Hello Craig, >> =20 >> Do you have the GAMI injectors or was your engine set up in a special = way? >> I thought that LOP operations are approved up to 28 inHG. I would = like to run mine with 32 inHg but I am afraid to damage something. >> Here is what I see so far: >> Climb =96 full power =96 full rich (this gives me the coolest temps) = =96 160=85170 IAS =96 CHT 380 =96 390 =96 results in 1600 ft/min = (beginning) 800 ft/min (end) >> Level off at FL22, FL23 =96 full power =96 full rich =96 TAS 292=85297 = (on the bezel =96 I know this reads high) =96 #3+4 CHT 380 - 390 >> After this LOP at FL22, FL23 at 28 inHG, 16.1 gph =96 TAS 270=85275 = (on the bezel) =96 #1 CHT 360=85375 >> Like I said I would like to run it at 32 inHg LOP but I am afraid I = damage something. >> =20 >> Ralf >> =20 >> From: Craig Berland. [mailto:cberland@systems3.net]=20 >> Sent: Friday, August 12, 2011 2:48 PM >> To: lml@lancaironline.net >> Subject: [LML] What are your numbers?? >> =20 >> Going to Oshkosh: >> 25,000 ft >> ISA +36 degF >> 2500 RPM >> 32 inHg >> 16.9 gph LOP >> 276 kts TAS (Chelton) >> 374 degF, #2 CHT >> 5.1 psi cabin pressure >> In my limited IV-P time, I see about 3 kts per 1000 ft altitude = increase. CHT=92s at 18,000 ft are very low (345 degF) and CHT=92s at = 25,000 ft are as above when LOP. I don=92t fly ROP except for climb. = OAT significantly affects fuel flow and therefore speed when LOP. The = IV-P is a fantastic traveling machine. >> =20 >> Craig Berland >> N7VG >> =20 >> =20 >> Hello guys >> So today I was happy flying with my 4p going from Daytona to Raleigh = and was wondering what cruise numbers you are using. >> For example I was cruising with a MAP of 29, FF=3D16.7, 2500rpm and = did 234kts at 17500ft. >> The plane seemed to be very happy, temps were perfect, engine sounded = happy. >> So what are your numbers? LOP? ROP? Ron Stevens >=20 --Apple-Mail-534-60636937 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=windows-1252 I = just saw APS has collected the pelican's perch articles into a .pdf = here:

On Aug 14, = 2011, at 9:05 PM, Colyn Case wrote:

the old saw is "it's not how = hard you run it. it's how you run it hard."
The thing you are trying = to avoid is high internal peak pressure.
That is more about = mixture and spark timing than MAP.
I would not hesitate to run = 32 inches IF I knew I was well lean of peak AND both TIT's were below = 1650 AND all CHT's below 380.
If you have a 7.5:1 compression = engine, that should give you a fuel flow of 17.6 gph or so, depending = on
which limit you hit first.

If you = haven't read this series it's well worth it.  See articles 63,64, = 65, 66

...and then = take the APS course.  worth every penny.  there's a cheaper = online-only one if you don't really want to see the computerized test = cell in action and a lot of good live interaction.


Hello = Craig,
Do = you have the GAMI injectors or was your engine set up in a special = way?
I thought = that LOP operations are approved up to 28 inHG. I would like to run mine = with 32 inHg but I am afraid to damage = something.
Here = is what I see so far:
Climb =96 full power =96 full rich (this gives me = the coolest temps) =96 160=85170 IAS =96 CHT 380 =96 390 =96 results in = 1600 ft/min (beginning) 800 ft/min (end)
Level off at FL22, FL23 =96 full = power =96 full rich =96 TAS 292=85297 (on the bezel =96 I know this = reads high) =96 #3+4 CHT 380 - 390
After this LOP at FL22, FL23 at = 28 inHG, 16.1 gph =96 TAS 270=85275 (on the bezel) =96 #1 CHT = 360=85375
Like = I said I would like to run it at 32 inHg LOP but I am afraid I damage = something.
 
Going to Oshkosh:
25,000 = ft
ISA +36 = degF
2500 = RPM
32 = inHg
16.9 gph = LOP
276 kts TAS = (Chelton)
374 = degF, #2 CHT
5.1 = psi cabin pressure
In my = limited IV-P time, I see about 3 kts per 1000 ft altitude increase. = CHT=92s at 18,000 ft are very low (345 degF) and CHT=92s at 25,000 ft = are as above when LOP.  I don=92t fly ROP except for climb.  = OAT significantly affects fuel flow and therefore speed when LOP.  = The IV-P is a fantastic traveling machine.
Craig = Berland
Hello = guys
So today I was = happy flying with my 4p going from Daytona to Raleigh and was wondering = what cruise numbers you are = using.
For example I = was cruising with a MAP of 29, FF=3D16.7, 2500rpm and did 234kts at = 17500ft.
The plane seemed to be very happy, temps were perfect, engine = sounded happy.
So what are your numbers? LOP? ROP? Ron= Stevens