Return-Path: Received: from imf20aec.mail.bellsouth.net ([205.152.59.68] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2751320 for flyrotary@lancaironline.net; Wed, 19 Nov 2003 08:18:42 -0500 Received: from TOSHIBAjhr ([209.215.55.60]) by imf20aec.mail.bellsouth.net (InterMail vM.5.01.06.05 201-253-122-130-105-20030824) with SMTP id <20031119131840.OWJS14456.imf20aec.mail.bellsouth.net@TOSHIBAjhr> for ; Wed, 19 Nov 2003 08:18:40 -0500 From: "John Slade" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: gauges Date: Wed, 19 Nov 2003 08:18:39 -0500 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000E_01C3AE75.BCB2B1A0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_000E_01C3AE75.BCB2B1A0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit MessageOK, I think I've got it. If you had a boost gauge and a MAP gauge side by side, they'd always move in parallel. They'd have to since they both have the same feed - right? Its just that the scale on the MAP gauge includes 30 inches of hg, so to know you're boost you'd have to subtract the pressure at you're height. e.g. roughly speaking boost PSI = (MAP - height thousands)-30/2 MAP = 42 @ SL = 6PSI MAP = 48 @ 10,000 = 4PSI Does this makes sense, or am I still missing something? > If you have to be responsible for reading the gauges full time .... My voice annunciator and an LED annunciator panel will let me know if any of 8 parameters get out of line. I agree that a computer would be better, but I like to scan the overall situation. Think of it this way - a scan of my gauges will tell me "everything is good" wheras the digital engine monitor works the other way - ie "nothing is wrong". I prefer the former. I'll get an EM3 when Tracy adds color analog output in a couple of months. Either that or I'll save another couple of k and get one of those analog EM systems... or another 10k + and get a Blue Mountain EFIS...... Regards, John ------=_NextPart_000_000E_01C3AE75.BCB2B1A0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
OK, I=20 think I've got it.
If you=20 had a boost gauge and a MAP gauge side by side, they'd always move in = parallel.=20 They'd have to since they both have the same feed - right? Its just that = the=20 scale on the MAP gauge includes 30 inches of hg, so to know you're = boost=20 you'd have to subtract the pressure at you're = height.
 
e.g. roughly=20 speaking   boost PSI =3D (MAP - height=20 thousands)-30/2
MAP =3D 42 @ SL=20 =3D 6PSI
MAP =3D 48 @=20 10,000 =3D 4PSI
 
Does this=20 makes sense, or am I still missing something?
 
> If you have to be responsible for = reading the=20 gauges full time ....
My voice annunciator = and=20 an LED annunciator panel will let me know if any of 8 parameters = get out of=20 line. I agree that a computer would be better, but I like to scan the = overall=20 situation. Think of it this way - a scan of my gauges will tell me = "everything=20 is good" wheras the digital engine monitor works the other way - ie = "nothing is=20 wrong". I prefer the former.  I'll get an EM3 when Tracy adds = color=20 analog output in a couple of months. Either that or I'll save another = couple of=20 k and get one of those analog EM systems... or another 10k + and get a = Blue=20 Mountain = EFIS......
Regards,
John=
 
&nbs= p;
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