Return-Path: Received: from relay03.roc.ny.frontiernet.net ([66.133.131.36] verified) by logan.com (CommuniGate Pro SMTP 4.1.6) with ESMTP id 2715809 for flyrotary@lancaironline.net; Sun, 09 Nov 2003 00:09:17 -0500 Received: (qmail 26739 invoked from network); 9 Nov 2003 05:09:16 -0000 Received: from unknown (HELO frontiernet.net) ([170.215.97.8]) (envelope-sender ) by relay03.roc.ny.frontiernet.net (FrontierMTA 2.3.6) with SMTP for ; 9 Nov 2003 05:09:16 -0000 Message-ID: <3FADCC46.DE63EAA2@frontiernet.net> Date: Sat, 08 Nov 2003 23:10:30 -0600 From: Jim Sower X-Mailer: Mozilla 4.77 [en] (Win98; U) X-Accept-Language: en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Murphy's law of precautionary landings References: Content-Type: multipart/alternative; boundary="------------AE9DA7C4594AD0A2719C8055" --------------AE9DA7C4594AD0A2719C8055 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Rusty, Good job on your [potentially] intense learning experience.. A 100 A fuze is pretty stout. There was a recent bit on the Velocity forum to the effect that a 60 amp alternator needs an 80 amp fuze at a minimum. If your alternator is over 75 A, you might want to go to a 120 A fuze. I think current limiters are only supposed to come into play if you get a dead short in the alternator output so some overkill (as much as 30%-40%) shouldn't hurt. I'm installing a 100 A fuze to protect my [allegedly] 75 A alternator. How big is your alternator anyway ... Jim S. Russell Duffy wrote: > Upon inspection, I found the 100A fuse to the alternator > blown.This doesn’t exactly give me a warm fuzzy feeling, > especially since I can’t see anything wrong except for the > blown fuse.Replaced the fuse, but didn’t have a chance to test > it since it was getting dark.I’ll be really surprised if the > alternator itself is bad, but I’ll find out when I run it > again.Fortunately, I already have the rev-2, smaller > alternator that can be mounted now if necessary. > --------------AE9DA7C4594AD0A2719C8055 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Rusty,
Good job on your [potentially] intense learning experience..
A 100 A fuze is pretty stout.  There was a recent bit on the Velocity forum to the effect that a 60 amp alternator needs an 80 amp fuze at a minimum.  If your alternator is over 75 A, you might want to go to a 120 A fuze.  I think current limiters are only supposed to come into play if you get a dead short in the alternator output so some overkill (as much as 30%-40%) shouldn't hurt.  I'm installing a 100 A fuze to protect my [allegedly] 75 A alternator.
How big is your alternator anyway ... Jim S.
 

Russell Duffy wrote:

Upon inspection, I found the 100A fuse to the alternator blown.This doesn’t exactly give me a warm fuzzy feeling, especially since I can’t see anything wrong except for the blown fuse.Replaced the fuse, but didn’t have a chance to test it since it was getting dark.I’ll be really surprised if the alternator itself is bad, but I’ll find out when I run it again.Fortunately, I already have the rev-2, smaller alternator that can be mounted now if necessary.
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