X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from omta.toronto.rmgopenwave.com ([4.59.182.110] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3830997 for flyrotary@lancaironline.net; Mon, 31 Aug 2009 20:22:54 -0400 Received-SPF: pass receiver=logan.com; client-ip=4.59.182.110; envelope-from=lacombr@nbnet.nb.ca Received: from torspm04.toronto.rmgopenwave.com ([142.167.67.161]) by tormtz03.toronto.rmgopenwave.com (InterMail vM.8.00.01.00 201-2244-105-20090324) with ESMTP id <20090901002220.SMNP12567.tormtz03.toronto.rmgopenwave.com@torspm04.toronto.rmgopenwave.com> for ; Mon, 31 Aug 2009 20:22:20 -0400 Received: from PCdeRita ([142.167.67.161]) by torspm04.toronto.rmgopenwave.com with SMTP id <20090901002219.LCAN6760.torspm04.toronto.rmgopenwave.com@PCdeRita> for ; Mon, 31 Aug 2009 20:22:19 -0400 Message-ID: <7B27C6591B1A46A4B1106822B2025A34@PCdeRita> From: "Rino" To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary] Re: FW: More Charging Circuit Info Date: Mon, 31 Aug 2009 21:22:08 -0300 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0089_01CA2A81.18779B80" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6001.18000 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18049 This is a multi-part message in MIME format. ------=_NextPart_000_0089_01CA2A81.18779B80 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I believe that modern aircrafts should be treated like modern cars. = Turn the power ON, turn the ignition switch to start the engine and let = it warm up while you do your checkup. I do have 2 independent = electrical systems, with alternator overvoltage crobars, no field = switches, these switches bring noise into the cockpit. I have 3 main = switches: Instruments, Equipment and Engine and they are turned ON in = that order before I hit the starter. No manufacturer should sell = electrical and electronic equipment that cannot withstand that much = abuse if we can call this abuse. Equipment that fail under NORMAL use = is defective equipment. Rino Lacombe Renesis powered Glass Goose ----- Original Message -----=20 From: Al Gietzen=20 To: Rotary motors in aircraft=20 Sent: Monday, August 31, 2009 4:18 PM Subject: [FlyRotary] Re: FW: More Charging Circuit Info From Mike - ...ensure that the field is de-energized while cranking = the engine. And I will respectfully disagree with that - at least until somebody = can prove me wrong. The output current is a function of rpm as well as = what the voltage regulator is demanding. From what I can find, I = conclude that alternators typically won't put out their rated current = until they get spinning about 1500 - 2000 rpm, or more (which is usually = about double engine rpm). So there is no risk of damaging the rectifier = diodes at cranking speed. I'm going to guess that it is a worse shock to the electronics if the = field is suddenly turned on at higher rpm when the regulator is on full = demand - although I don't think it's an issue. Off topic, another 1.2 hours closer to completing my Phase 1. = This was the first flight that after I landed I didnt have anything on = my list to fix before the next flight. 95 degrees OAT at takeoff today = and the oil temp got to 200 at the top of the climb to 5000' but backed = off to 192 after I leveled. H2O temp never above 180. Starting to gain = some confidence in it.=20 Contrary to our friend George's faint praiseJ, I'd say your temps = are excellent. If it does that well at OAT of 95 F; then your next = thing will be to think about adjustable cowl flap to reduce cooling drag = at cruise on a cooler day. Al ------=_NextPart_000_0089_01CA2A81.18779B80 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I believe that modern aircrafts should = be treated=20 like modern cars.  Turn the power ON, turn the ignition switch to = start the=20 engine and let it warm up while you do your checkup.  I do have 2=20 independent electrical systems, with alternator overvoltage crobars, no = field=20 switches, these switches bring noise into the cockpit.  I have 3 = main=20 switches: Instruments, Equipment and Engine and they are turned ON in = that order=20 before I hit the starter.   No manufacturer should sell = electrical and=20 electronic equipment that cannot withstand that much abuse if we can = call this=20 abuse.  Equipment that fail under NORMAL use is defective=20 equipment.
 
Rino Lacombe
Renesis powered Glass = Goose
 
----- Original Message -----
From:=20 Al = Gietzen=20
Sent: Monday, August 31, 2009 = 4:18=20 PM
Subject: [FlyRotary] Re: FW: = More=20 Charging Circuit Info

From=20 Mike   - =85..ensure that the field is = de-energized=20 while cranking the engine.

 

And I = will=20 respectfully disagree with that =96 at least until somebody can prove = me wrong.=20  The output current is a function of rpm as well as what the = voltage=20 regulator is demanding.  From what I can find, I conclude that=20 alternators typically won=92t put out their rated current until they = get=20 spinning about 1500 =96 2000 rpm, or more (which is usually about = double engine=20 rpm). So there is no risk of damaging the rectifier diodes at cranking = speed.

 

I=92m = going to guess=20 that it is a worse shock to the electronics if the field is suddenly = turned on=20 at higher rpm when the regulator is on full demand =96 although I = don=92t think=20 it=92s an issue.

 

 Off topic, = another 1.2=20 hours closer to completing my Phase 1. This was the first flight = that=20 after I landed I didnt have anything on my list to fix before the = next=20 flight. 95 degrees OAT at takeoff today and the oil temp got = to 200=20 at the top of the climb to 5000' but backed off to 192 after I = leveled.=20 H2O temp never above 180. Starting to gain some confidence in it.=20

Contrary to our=20 friend George=92s faint praiseJ, = I=92d say your=20 temps are excellent.  If it does that well at = OAT of = 95 F; then=20 your next thing will be to think about adjustable cowl flap to = reduce=20 cooling drag at cruise on a cooler day.

Al

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