On Sep 15, 2011 5:31 PM, "Tom Walter" <roundrocktom@yahoo.com> wrote:
> Worth a try!
>
> With a gear running in north south orientation, on sensor facing west, the other facing east....  Would be simple to rig up
> a test fixture and try it.
>
> Someone asked about installing the two sensors shoulder to shoulder.  With a 8" wheel,  a 5 degree offset is about 0.35", which is pretty tight spacing.   If you went 10 degrees, it would work for that limp home mode function (retarded timing).
>
> A simple two rotor solution, is independent ECU systems for front and rear rotors. The two sensors being 180 degrees apart to match rotor faces.
>
> For the Bosch Systems, we had "limp home" built into ignition chip, with backup from the camshaft sensor.  If CAS failed, then cam sensor could be use for batch firing fuel injectors, and simple ignition spark.    I've told the story of having the wrong XTAL filter caps on the module.   The Main CPU (6805) oscillator didn't start, so the engine went into Limp Home mode... Cold Weather Emissions Testing facility.  I wonder if anyone at Fiat still remembers that one (circa 1985).  25 years later I can chuckle about that one!  Ljetronic3.1 was a fun project (hybrid on the top of the airflow meter). 
>
>
> Tom
>
>
>
> ________________________________
> From: "CozyGirrrl@aol.com" <CozyGirrrl@aol.com>
> To: Rotary motors in aircraft <flyrotary@lancaironline.net>
> Sent: Thursday, September 15, 2011 4:14 PM
> Subject: [FlyRotary] Re: The good news and the bad news......
>
>
> Not side by side-
> In the placement described we are talking about them facing each other with
> a gap between the faces of 0.100~0.125 and the wheel face between them like an
> interrupter between optical sense and receive.
>  
> Chrissi &
> Randi
> www.CozyGirrrl.com
> CG
> Products, Custom Aircraft Hardware
> Chairwomen, Sun-N-Fun Engine Workshop
>
>  
> In a message dated 9/15/2011 4:01:36 P.M. Central Daylight Time,
> alwick@juno.com writes:
> <concern is that the two sensors may have interference with each other.
>> 
>>Highly unlikely. I have friends who measure integrity of signal with oscilloscope. Shielded device with highly directional sensitivity. Though they've never measured two side by side. Good theory, though.
>> 
>>-al wick
>>----- Original Message -----
>>>From: wrjjrs@aol.com
>>>To: Rotary motors in aircraft
>>>Sent: Thursday, September 15, 2011 12:18 PM
>>>Subject: [FlyRotary] Re: The good news and the bad news......
>>>
>>>
>>>There is nothing wrong with that idea. The only concern is that the two sensors may have interference with each other. The idea is to put another toothed wheel rotated say a random 33.715 degrees relative to the first wheel. Now you place the second sensor rotated the same 33.7....etc degrees. So now when you switch sensors the timing is the same. Also the two sensors don't interfere with each other.
>>>Bill
> Jepson
>>>
>>>Connected by DROID on Verizon Wireless
>>>
>>>-----Original
> message-----
>>>
>>>From: Chad Robinson <crobinson@medialantern.com>
>>>>To: Rotary motors in aircraft <flyrotary@lancaironline.net>
>>>>Sent: Thu, Sep 15, 2011 17:45:46 GMT+00:00
>>>>Subject: [FlyRotary] Re: The good news and the bad news......
>>>>
>>>>
>>>>On 9/15/2011 1:21 PM, Tracy wrote:
>>>>The CAS references the crank, not the rotor.   Is that. It?
>>>>>I'm still confused about something myself. Everybody keeps talking about adding another CAS as requiring it to be "in a different position", with an offset. My 3rd-gen CAS sits on a small bracket just behind the toothed wheel on the front shaft. Past that toothed wheel there's a healthy (from memory: 1.5"?) gap from there to the back of the alternator pulley.
>>>>
>>>>What's to stop me from making a
> bracket and putting a second CAS in that gap, facing backward? It would be
> in exactly the same position as the current CAS, just facing backward.
> Would they interfere with one another? If so, as an alternative, what
> about using a second toothed wheel either on top of the first and before
> the alternator pulley, or if side loads were a concern, on the very end of
> the shaft past the
> pulley?
>>>>
>>>>