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Message-ID: <4AF88D53.6000502@gmail.com>
Date: Mon, 09 Nov 2009 16:44:51 -0500
From: Steve Brooks <cozy4pilot@gmail.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Battery Location[FlyRotary] Re: No start after
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Steve,
Thanks for the information. No resolution yet. I gave up yesterday, and 
watched a little football, then went out to eat with my wife.

Good suggestion with the spare CAS, I can give that a try, perhaps even 
rig it up somehow to the cordless drill or something.

I had one thought today, while thinking about anything that was 
different. On the CAS, the shielded wire used to run all the way to the 
CAS, but in the process of re-routing the wiring, I extended the CAS 
wires about 12 inches with regular aircraft wire (non-shielded). I am 
wondering if that is causing the trouble. I was thinking that I could 
shield it for a test, with aluminum foil, and use a clip to ensure good 
connection to the existing shield. That should work good enough to see 
if that short section of unshielded wire is the culprit.

Any opinion ?

sboese wrote:
>
> Steve,
>
> In case you haven’t resolved your no spark situation, I collected some 
> more data to look at. The attached image shows the CAS signals and 
> coil control signals just at the point where one of my EC2’s starts to 
> generate sparks. The yellow trace is the two toothed CAS sensor 
> signal, The violet trace is the 24 tooth CAS signal, the red trace is 
> the #2 rotor leading coil control signal, and the white trace is the 
> #1 rotor leading coil control signal. The voltages indicated must be 
> multiplied by 3.3 to compensate for the voltage divider on the input 
> signals.
>
> It may be possible to put your meter on an AC volts function and get 
> an idea if your signal amplitudes are comparable to those shown. In 
> particular, this may work for the 24 tooth CAS signal since it is 
> closer to a sine waveform.
>
> Since you have a spare CAS, you might consider connecting it up 
> temporarily without installing it in the engine. Then with all of the 
> system powered up except the injectors, give it a spin by hand - the 
> CAS that is- not the engine. Since you can easily spin the CAS faster 
> than it would be when cranking the engine, you should be able to 
> generate CAS signals of greater amplitude. Maybe you’ll get sparks 
> then. If you want to go through the effort, you could also connect 
> that CAS to the EC2 directly without going through the present wiring 
> harness and see what you get then.
>
> Hopefully things have been resolved now and you can just ignore my 
> rambling.
>
> Steve Boese
>
>
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