X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.100] (HELO ms-smtp-01-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 5.0c2) with ESMTP id 712013 for flyrotary@lancaironline.net; Mon, 05 Sep 2005 17:14:35 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.100; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-065-188-083-049.carolina.res.rr.com [65.188.83.49]) by ms-smtp-01-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j85LDlWf000187 for ; Mon, 5 Sep 2005 17:13:48 -0400 (EDT) Message-ID: <001201c5b25e$735ea6a0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Another great flying day = another day of troubleshooting Date: Mon, 5 Sep 2005 17:11:57 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000F_01C5B23C.EC13CE30" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_000F_01C5B23C.EC13CE30 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable No problem, Thomas. Glad somebody thinks enough to keep me on track. = That's what's nice about this list - you can have a "bad" day and you = don't get beat up- too badly (unless Rusty is around {:>)). Ed ----- Original Message -----=20 From: rijakits=20 To: Rotary motors in aircraft=20 Sent: Monday, September 05, 2005 5:05 PM Subject: [FlyRotary] Re: Another great flying day =3D another day of = troubleshooting Sorry Ed! I answered a previous message before reading this one! :)) Thomas J. ----- Original Message -----=20 From: Ed Anderson=20 To: Rotary motors in aircraft=20 Sent: Monday, September 05, 2005 3:11 PM Subject: [FlyRotary] Re: Another great flying day =3D another day of = troubleshooting You're absolutely correct. The pressure ratio has nothing to do with = MAP. I knew I should have had a second cup of coffee this morning. = Back to trying to get a graphical LCD to work - hopefully with more = success than encountered on this topic {:>) Duh! Ed ----- Original Message -----=20 From: David Leonard=20 To: Rotary motors in aircraft=20 Sent: Monday, September 05, 2005 2:39 PM Subject: [FlyRotary] Re: Another great flying day =3D another day = of troubleshooting Ed I am talking MAP in both cases. I don't see how 26" MAP is = higher than 36"MAP. But I learned the old math :-) Dave =20 On 9/5/05, Ed Anderson wrote:=20 Well, actually it is absolute pressure that the spark plug is = reacting to. In this example, the absolute pressure in the intake is = 1.234" HG higher at 10,000 with your 26 " boost than at sea level with = your 36" of boost.. This would contribute to an increased pressure in = the combustion chamber when it is compressed over the sea level = compression pressure. Therefore, the spark plug is facing a tougher = task at 10,000 than at Sea level (in this example).=20 Ed ----- Original Message -----=20 From: David Leonard=20 To: Rotary motors in aircraft=20 Sent: Monday, September 05, 2005 12:57 PM Subject: [FlyRotary] Re: Another great flying day =3D another = day of troubleshooting =20 Actually, Dave you had a higher pressure ratio (manifold = to ambient) at 10,000 feet with 26" boost than at sea level with 36". = At sea level the pressure ratio would be 36/29.92 =3D 1.20. At 10,000 = ft ambient pressure =3D 20.57 " hg , so the pressure ratio would be = 26/20.57 =3D 1.26. Not much greater, but it was higher by approx.1.23" = Hg. (1.20 -1.26 =3D .06 *20.57 =3D 1.234" Hg).=20 Ed A Right. But what does the plug know about the ambient = pressure? I thought that it was just the absolute density of the charge = that was contributing to SAG.=20 --=20 Dave Leonard Turbo Rotary RV-6 N4VY http://members.aol.com/_ht_a/rotaryroster/index.html=20 http://members.aol.com/_ht_a/vp4skydoc/index.html=20 --=20 Dave Leonard Turbo Rotary RV-6 N4VY http://members.aol.com/_ht_a/rotaryroster/index.html http://members.aol.com/_ht_a/vp4skydoc/index.html ------=_NextPart_000_000F_01C5B23C.EC13CE30 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
No problem, Thomas.  Glad somebody = thinks enough=20 to keep me on track.  That's what's nice about this list - you can = have a=20 "bad" day and you don't get beat up- too badly  (unless Rusty is = around=20 {:>)).
 
Ed
----- Original Message -----
From:=20 rijakits
Sent: Monday, September 05, = 2005 5:05=20 PM
Subject: [FlyRotary] Re: = Another great=20 flying day =3D another day of troubleshooting

Sorry Ed!
 
I answered a previous message before reading = this one!=20 :))
 
Thomas J.
----- Original Message -----
From:=20 Ed Anderson
To: Rotary motors in = aircraft=20
Sent: Monday, September 05, = 2005 3:11=20 PM
Subject: [FlyRotary] Re: = Another great=20 flying day =3D another day of troubleshooting

You're absolutely correct. The pressure = ratio has=20 nothing to do with MAP.   I knew I should have had a = second cup of=20 coffee this morning.   Back to trying to get a graphical = LCD to=20 work - hopefully with more success than encountered on this topic = {:>)=20 Duh!
 
Ed
 
----- Original Message -----
From:=20 David=20 Leonard
To: Rotary motors in = aircraft=20
Sent: Monday, September 05, = 2005 2:39=20 PM
Subject: [FlyRotary] Re: = Another=20 great flying day =3D another day of troubleshooting

Ed I am talking MAP in both cases.  I don't see how 26" = MAP is=20 higher than 36"MAP.  But I learned the old math  = :-)
 
Dave

 
On 9/5/05, Ed=20 Anderson <eanderson@carolina.rr.com&g= t;=20 wrote:=20
Well, actually it is absolute pressure = that the=20 spark plug is reacting to.  In this example, the absolute = pressure=20 in the intake is 1.234" HG higher at 10,000 with your 26 " boost = than at=20 sea level with your 36" of boost..  This would contribute = to an=20 increased pressure in the combustion chamber when it is = compressed over=20 the sea level compression pressure.  Therefore, the spark = plug is=20 facing a tougher task at 10,000 than at Sea level (in this = example).=20
 
Ed
----- Original Message ----- =
From: David = Leonard=20
To: Rotary motors=20 in aircraft
Sent: Monday, September = 05, 2005=20 12:57 PM
Subject: [FlyRotary] = Re: Another=20 great flying day =3D another day of troubleshooting

 

 Actually, Dave you had a higher pressure ratio = (manifold=20 to ambient) at 10,000 feet with 26" boost than at sea = level with=20 36".  At sea level the pressure ratio would be = 36/29.92 =3D=20 1.20.  At 10,000 ft ambient pressure =3D 20.57 " hg , = so the=20 pressure ratio would  be 26/20.57 =3D=20 1.26.  Not much greater, but it was higher by = approx.1.23"=20 Hg. (1.20 -1.26 =3D .06 *20.57 =3D 1.234" Hg).

Ed=20 A

Right.  But = what does=20 the plug know about the ambient pressure?  I thought that = it was=20 just the absolute density of the charge that was contributing = to SAG.=20

--
Dave Leonard
Turbo Rotary RV-6 N4VY
http://members.aol.com/_ht_a/rotaryroster/index.html=20
http://members.aol.com/_ht_a/vp4skydoc/index.html=20



--=20
Dave Leonard
Turbo Rotary RV-6 N4VY
http://memb= ers.aol.com/_ht_a/rotaryroster/index.html
http://members= .aol.com/_ht_a/vp4skydoc/index.html=20
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