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Message-ID: <4B093173.2070207@gmail.com>
Date: Sun, 22 Nov 2009 07:41:23 -0500
From: Steve Brooks <cozy4pilot@gmail.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: No start
References: <list-3984974@logan.com>
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Mark,
I am thinking about just running all but the starter off of the forward 
battery.  Since I have two batteries, it is a relatively easy fix.  It 
still bugs me, what has changed. 

Steve

Mark Steitle wrote:
> Steve,
>  
> Early on with my project, I was beginning to start/run the engine.  I 
> quickly discovered that sometimes it would start, and sometimes it 
> wouldn't.  If the battery voltage dropped to some unknown voltage the 
> engine would not start, even though it would continue to crank 
> (although slower than normal).  I didn't have a working charging 
> system at the time, so the battery would get weaker and weaker as I 
> continued down this road.  At the time I was using a 12v Panasonic 
> emergency backup supply battery.  It didn't have the CCA to do more 
> than one or two cranks before the voltage dropped too low to possibly 
> start the engine.  I must have damaged the battery in the process as a 
> new battery solved the problem.  You stated that you installed a new 
> battery, but you didn't state if you charged it up before trying to 
> start your engine. 
>  
> I suggest you 1) charge the new battery to 100%, 2) hook up the 
> starter to a spare battery for cranking. 
>  
> Personally, I think this makes a good case for going with a 24v system. 
>  
> Mark S.
>  
>
>
>  
> On Sat, Nov 21, 2009 at 12:40 PM, Steven W. Boese <SBoese@uwyo.edu 
> <mailto:SBoese@uwyo.edu>> wrote:
>
>     Steve,
>
>     I was able to produce symptoms similar to what you describe by
>     inserting a 1.5 V flashlight battery into the CAS return wire such
>     that the CAS end of the wire was 1.5 V more negative than the CAS
>     return wire going to the EC2:
>     CAS ----- battery ++++ EC2
>
>     The opposite polarity didn't cause problems.  With the battery
>     installed, there are one or two sparks when starting to turn the
>     CAS and then no more sparks until the CAS sensor is turning
>     significantly faster than would be the case when turning the
>     engine with the starter.
>
>     It seems that you may have the CAS return grounded in addition to
>     the connection to the EC2.  If this is the case, then the voltage
>     drop from the starter current may shift the CAS return voltage
>     similar to what I did with the test setup.  If I disconnect the
>     CAS from the EC2 at the EC2 connector, all the CAS wires show
>     infinite resistance to ground.  It might be useful to see if your
>     wiring is similar.
>
>     Steve Boese
>
>
>
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