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From: "William" <wschertz@ispwest.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-961376@logan.com>
Subject: Re: [FlyRotary] Amps consumed data
Date: Mon, 23 May 2005 21:18:51 -0500
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Bernie,

This is the kind of data that is really useful, thanks for getting it.

Do you have an internally or externally regulated alternator?
Bill Schertz
KIS Cruiser # 4045
----- Original Message ----- 
From: "WALTER B KERR" <jbker@juno.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, May 23, 2005 8:09 PM
Subject: [FlyRotary] Amps consumed data


> Finally got around to getting batteries in the clamp on amp meter and a
> run with the cowl off and someone to clamp the feed line between the
> battery and alternator. The alternator was pumping 19.3 amps after
> turning the alternator field on immediately after the start with
> everything on in the airplane. When I switched the alternator off it went
> to 0 despite some folks thinking it would continue to produce using its
> on voltage to power the field. This does not happen in my case where
> there is only one wire of the 3 connected to the plug. It is a battery
> supply line via a switched CB to the B lead on the alternator. One of the
> things I wish to get input on at Charlie's(really Tupper's) this weekend
> is advice on hooking up a voltage crowbar to keep the alternator from
> burning up my EC2 filter or whatever else. It seems like an easy thing to
> do since shutting off this one line stops the output cold. 
> 
> After running a few minutes to get the battery charged back measured the
> amps going to the bus with everything off except engine stuff and it was
> 6 amps at 1400 rpm and 10 amps at 4500rpm. So my 1 hour on the battery
> only flight at 5000 rpm probably consumed most of the amps available in
> the PC625 battery.
> 
> Still would be interesting to run a test on the ground from 11 volts till
> engine dies , but want to clear this with Tracy first.
> 
> Bernie
> 
> 
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