X-Junk-Score: 0 [] X-Cloudmark-Score: 0 [] X-Cloudmark-Analysis: v=2.2 cv=QoAc5h6d c=1 sm=1 tr=0 a=IX6eaE+DqNKGQiIer2SbOQ==:117 a=ToaUX8feg4eQ4GlCfSXS5A==:17 a=x7bEGLp0ZPQA:10 a=A-0mRrAPPO4A:10 a=dapMudl6Dx4A:10 a=r77TgQKjGQsHNAKrUKIA:9 a=HZJGGiqLAAAA:8 a=eRLigfuSAAAA:8 a=Ia-xEzejAAAA:8 a=HO2ynIb2AAAA:8 a=_6GpL_ENAAAA:8 a=7RAkndbrCi1HoUJUa8wA:9 a=QEXdDO2ut3YA:10 a=4PR2P7QzAAAA:8 a=HkPeOi90Eq-Wj2bth00A:9 a=IG8furxxaMkP3c-e:21 a=_W_S_7VecoQA:10 a=BfhXYjFvZD4iae-mNffo:22 a=Urk15JJjZg1Xo0ryW_k8:22 a=bvrkM4X6LKZK3lcHLHqc:22 a=4dqwQCo7Po2mVW515mGf:22 From: "Charlie England ceengland7@gmail.com" Received: from mail-yw1-f45.google.com ([209.85.161.45] verified) by logan.com (CommuniGate Pro SMTP 6.2.6) with ESMTPS id 11474554 for flyrotary@lancaironline.net; Fri, 03 Aug 2018 14:04:48 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.161.45; envelope-from=ceengland7@gmail.com Received: by mail-yw1-f45.google.com with SMTP id r3-v6so1289322ywc.5 for ; Fri, 03 Aug 2018 11:04:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to:content-language; bh=swUq1AyyATY58yMM9X66TqZw6l/UE/NTthtRMwYgCiI=; b=k4WMyPDmFV8zYsarFM9TnVy9X63ic04EF+OqEbpVH4JV/9OLvdek90VP8m+Dm2PBxo e7vK7Blnq65/zH697y3BWphqM1wyy4LAgcUhuZ+G61B7G23/KN/TpFYK/+MJ+O+xsfns Xc+oBVbLLkB3zPwfQdhH2Xl/XewEWOqzgDptys94zGMhoVhwMs9CA9NEy4YSOGRFqQve WcdY1UmnXc2syYlU7fPN4IZ0giAuCaZHm1VKvpyOgMBx1qiGTSWgMak0t7LE2/UqJ4m/ CT2yq7/y8rOyWnn2DAK1HZQeLfOKS4Alc4rmhEqupGCxGDWIaGDzo8o5ESxdIUQBvYFw XI+Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language; bh=swUq1AyyATY58yMM9X66TqZw6l/UE/NTthtRMwYgCiI=; b=IdMK2UmI3RkVg4QFq28Rhg0C4lSxuIRbzG3l20/GCNriuo6j5YrXtl37GIEADKcgra 9Ci1/qcaxgpd5vo2oyydyi/s3iHrDdy3Q8MLzwI/lJStjnw97iIDr5zi/r7gefcT0RY4 1trNqnVZf1KqNs6mfCXHNMhXYZOov1FF1KzWHH+zVAMiIzEtCevRdqxaOT/FcalQLBco G0DzOdm/ZrIS7CrNGhElZaY+793cstls4MS2c5tILdvIcbh7fT83zuHfPdoMBEnjsydx 87E4Uv3/Sd5AVoW/QWMb6W7exuo6RK6f9+XYT5av52M910EWEg3iywmLDKnF7oIz2Ie7 WzRA== X-Gm-Message-State: AOUpUlEHwnGGfwbhA5JBHj0/OZASJcPTrKzmotGlftctez/KVCKblKvX 9pgWUMbEQGSoNl/3OiQFGpSmRijT X-Google-Smtp-Source: AAOMgpdZIfhw6YVvxxZeaogVJOkBjuuzShk80HLbMOt6MnjPhad2qxFdPm0BA7Es9sjf7JSTqYksfg== X-Received: by 2002:a81:b54:: with SMTP id 81-v6mr2730643ywl.363.1533319470379; Fri, 03 Aug 2018 11:04:30 -0700 (PDT) Return-Path: Received: from [192.168.10.217] ([166.137.96.3]) by smtp.googlemail.com with ESMTPSA id h126-v6sm2274375ywf.73.2018.08.03.11.04.29 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 03 Aug 2018 11:04:29 -0700 (PDT) Subject: Re: [FlyRotary] Re: Alternator Damaged - Internal Short To: Rotary motors in aircraft References: Message-ID: <3be13e86-4571-e6e8-35a4-60d131136f7f@gmail.com> Date: Fri, 3 Aug 2018 13:05:45 -0500 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/alternative; boundary="------------8B15CE96D27D7831D1D99102" Content-Language: en-US X-Antivirus: Avast (VPS 180803-8, 08/03/2018), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. --------------8B15CE96D27D7831D1D99102 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit I'm pretty sure that's not true. the raw output from a PM alternator can be way north of 50 volts *AC*, depending on rpm & load. Depending on regulator failure mode, you could easily see that much DC voltage coming out of the regulator. Heavy loads will drag the voltage down, but if the battery's topped off and you're day VFR, the alternator may be seeing very little load. Charlie On 8/3/2018 9:31 AM, Ernest Christley echristley@att.net wrote: > I like PM generators for that reason.  They can't runaway. > Now, they are generally limited to around 30 amps, but with LED > lighting, there aren't many airplanes that would push that limit. > > > On Thursday, August 2, 2018 8:44 PM, "Andrew Martin > andrew@martinag.com.au" wrote: > > > If you want to be able to control the output of your alternator > http://www.aeroelectric.com/articles/Alternators/One-Wire_Alternator_Conversion.pdf > > Otherwise as Tracy says, and accept the small risk that you may end up > with a runaway alternator & unable to shut it down. > > Andrew > -- > Regards Andrew Martin Martin Ag > > --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus --------------8B15CE96D27D7831D1D99102 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit
I'm pretty sure that's not true. the raw output from a PM alternator can be way north of 50 volts *AC*, depending on rpm & load. Depending on regulator failure mode, you could easily see that much DC voltage coming out of the regulator. Heavy loads will drag the voltage down, but if the battery's topped off and you're day VFR, the alternator may be seeing very little load.

Charlie


On 8/3/2018 9:31 AM, Ernest Christley echristley@att.net wrote:
I like PM generators for that reason.  They can't runaway. 
Now, they are generally limited to around 30 amps, but with LED lighting, there aren't many airplanes that would push that limit.


On Thursday, August 2, 2018 8:44 PM, "Andrew Martin andrew@martinag.com.au" <flyrotary@lancaironline.net> wrote:


If you want to be able to control the output of your alternator
Otherwise as Tracy says, and accept the small risk that you may end up with a runaway alternator & unable to shut it down.

Andrew
--
Regards Andrew Martin Martin Ag




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