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Date: Mon, 13 Jul 2009 17:01:01 -0600
From: Bob White <bob@bob-white.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] cold switch and injector backup mode
Message-Id: <20090713170101.6efc87a2.bob@bob-white.com>
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Hi Steve,

Thanks for checking that out.  That's pretty much what I though it
should do as needing to know whether the injectors are powered or not
would be more complicated. 

Speaking of your data logger, are you selling a info/design CD yet?
I would like to build on for use in my Alpine installation.  I used a
video camera for data capture in the BD-4 but had to remember to push
the button to go to different screens to get all the data.

Bob W.


On Mon, 13 Jul 2009 16:24:14 -0600
sboese <sboese@uwyo.edu> wrote:

> This weekend I had a chance to make some observations concerning the
> previous discussion on the use of the cold switch and the injector backup
> mode on my EC2 used with a 13B.
> 
>  
> 
> When idling, turning on the cold switch results in all four injectors
> delivering fuel at the pulse width that was used by the primary injectors
> before the cold switch was turned on.  
> 
>  
> 
> When idling, turning on the cold switch results in the staging data bit
> changing from indicating operation at MAP below the staging threshold to
> operation above the staging threshold even though the MAP is very low.
> 
>  
> 
> With the cold switch on, gradually increasing MAP results in a gradually
> increasing injector pulse width from idle to full throttle with no
> discontinuity when the staging threshold is crossed.
> 
>  
> 
> Turning off the power to either the primary or secondary injectors has no
> effect on the pulse width applied to the injectors or the status of the
> staging data bit.
> 
>  
> 
> Based on the above observations, it appears that the EC2 does not need to
> know whether or not power is being sent to the injectors.  Regardless of the
> MAP at the time, turning on the cold switch results in the EC2 operating
> with all four injectors as if the MAP was above the staging threshold but
> with a pulse width appropriate for only two injectors being used.
> 
>  
> 
> My statements below concerning the cold switch position appear to be in
> error.  The position of the Cold Switch is not one of the things contained
> in the data log captured from the EC2 so that piece of data was from my
> memory which is poor at best.  Sorry Bob.
> 
>  
> 
> I probably should have maintained the "Avoid reading.." subject line. 
> 
>  
> 
> Steve Boese
> 
>  
> 
> 
> 
> 
> From:
> 
> Steven Boese <sboese@uwyo.edu>
> 
> 
> Subject:
> 
> RE: [FlyRotary] Re: Below staging
> 
> 
> Date:
> 
> Mon, 6 Jul 2009 00:24:28 -0600
> 
> 
> To:
> 
> "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
> 
>  <http://lancaironline.net/lists/flyrotary/Message/46928-H.txt> Message
> Header
> 
>  <http://lancaironline.net/lists/flyrotary/Message/46928-P.txt> Undecoded
> Message
> 
> 
> 
> Bob,
> 
> In contrast to when the primary injector power is off, when the
> secondary injectors are turned off and the cold switch on, the EC2
> indicates staging is taking place normally at the staging threshold, in
> my case at about 20 inches MAP. The engine doesn't go lean after
> staging is indicated, however. When idling with the secondary injectors
> turned off and the cold switch on, the EC2 indicates no staging has
> taken place. Of course, what the EC2's staging data bit is telling the
> outside world and what The EC2 is actually doing may be two different
> things. 
> 
> Steve Boese
> 
>  
> 
> 


-- 
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