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Message-ID: <4B093315.6010108@gmail.com>
Date: Sun, 22 Nov 2009 07:48:21 -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
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Dave,
Since it works using a separate battery to crank, I had kind of ruled 
out the CAS interference.  I think that it is either interference from 
the starter to the EC-2 from noise on the 12 VDC buss, or the voltage 
sag.  The power at the EC-2 drops to 10.6 volts while cranking.  This 
doesn't seem too bad to me, but something must be on the edge of 
operating.  I have to order some wire in order to power the rear buss 
from the forward battery, but I am going to repeat my separate battery 
test today, just to make sure that works consistently.

Steve

David Leonard wrote:
> I think Steve is onto something here.  If you run the starter off the 
> other battery, it is likely to solve the problem reguardless of cause 
> just like your test run with an external battery.
>  
> With reguard to the actual cause, I tend to side with Tracy in that is 
> more likely to be CAS interference rather than low voltage.  I have 
> left my master on for several hours.  Enough that when the started 
> turned (and it barely turned) the voltage dropped low enough to really 
> dim the cocktpit lights and shut down the music radio, but the EC2 had 
> enough juice to get the engine going.
>  
> Good luck!
>
> -- 
> David Leonard
>
> Turbo Rotary RV-6 N4VY
> http://N4VY.RotaryRoster.net
> http://RotaryRoster.net
>  
> On Sat, Nov 21, 2009 at 10:40 AM, 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
>
>
>
>     --
>     Homepage:  http://www.flyrotary.com/
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>
>