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Subject: Re: [FlyRotary] Re: The good news and the bad news......
References: <list-5124697@logan.com>
From: Tracy <rwstracy@gmail.com>
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Date: Wed, 14 Sep 2011 16:06:20 -0600
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Short answer is no.   It's never that simple.
Tracy

Sent from my iPad

On Sep 14, 2011, at 3:59 PM, Tom Walter <roundrocktom@yahoo.com> wrote:

> Tracy,
>=20
> If the second CAS sensor was set up at 120 crank degrees after the first o=
ne, wouldn't that be a zero offset?
>=20
> My thoughts:  Rotor spins at 1/3 crank speed..... so with 720 crank revolu=
tions, that is six ignition events. So each ignition event is 120 degrees ap=
art.    Yes, I tend to think in 720 crankshaft degrees, to many years in aut=
omotive piston engines. =20
>=20
> Tom
>=20
>=20
>=20
>=20
>=20
>=20
> From: Tracy <rwstracy@gmail.com>
> To: Rotary motors in aircraft <flyrotary@lancaironline.net>
> Sent: Wednesday, September 14, 2011 4:43 PM
> Subject: [FlyRotary] Re: The good news and the bad news......
>=20
> The relay is not needed in this hypothetical fix.   The EC2/3 already has 2=
 CAS inputs.  All that is needed is a hard definition of sensor offset so th=
e software can be written appropriately.  ( I'm assuming a Renesis engine wh=
ich has only one CAS in this discussion.)
>=20
> The CAS output is an AC voltage sine-wave that varies with engine speed.  =
 This is true for both Mazda and Subaru engines (and almost all others).   T=
he sensor is a variable reluctor type.  =20
>=20
> Tracy
>=20
> Sent from my iPad
>=20
> On Sep 14, 2011, at 11:53 AM, Chad Robinson <crobinson@medialantern.com> w=
rote:
>=20
>> On 9/14/2011 1:48 PM, Al Wick wrote:
>>>=20
>>> <What kind of signal is on the CAS line
>>> If memory serves, it's 0 to 5vdc square wave.
>>> =20
>>> <Could it go through a relay safely?
>>> Yes, but I'm not sure where you are going. You thinking normally closed c=
ontacts to OEM CAS, norm open to backup CAS? You still have to manage angle o=
ffset. Would be unfortunate to have moisture in relay or turbulence disrupt C=
AS. Likely not going to end up with safety improvement. Good creative idea t=
hough.
>> The rotary engine CAS is set up on a bracket near the front pulley. I was=
 envisioning a system where you had a sensor in exactly the same spot on the=
 other side of the toothed wheel. You might need an offset alternator pulley=
 to make room for it - but then you don't have to worry about angles/offsets=
. It's just a second sensor, ready to go - flip a switch and try an engine r=
estart. If relay reliability was a concern there are always SSRs or even jus=
t good switching transistors...
>>=20
>=20
>=20

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<html><body bgcolor=3D"#FFFFFF"><div>Short answer is no. &nbsp; It's never t=
hat simple.</div><div>Tracy</div><div><br>Sent from my iPad</div><div><br>On=
 Sep 14, 2011, at 3:59 PM, Tom Walter &lt;<a href=3D"mailto:roundrocktom@yah=
oo.com">roundrocktom@yahoo.com</a>&gt; wrote:<br><br></div><div></div><block=
quote type=3D"cite"><div><div style=3D"color:#000; background-color:#fff; fo=
nt-family:times new roman, new york, times, serif;font-size:12pt"><div><span=
>Tracy,</span></div><div><br><span></span></div><div><span>If the second CAS=
 sensor was set up at 120 crank degrees after the first one, wouldn't that b=
e a zero offset?</span></div><div><br><span></span></div><div><span>My thoug=
hts:&nbsp; Rotor spins at 1/3 crank speed..... so with 720 crank revolutions=
, that is six ignition events.</span><span> So each ignition event is 120 de=
grees apart.&nbsp;&nbsp;&nbsp; Yes, I tend to think in 720 crankshaft degree=
s, to many years</span><span> in automotive piston engines.&nbsp; <br></span=
></div><div><br></div><div>Tom<br><span></span></div><div><br><span></span><=
/div><div><span><br></span></div><div><br><span></span></div><div><span><br>=
</span></div><div><br><span></span></div><div><span></span></div><div><br></=
div><div style=3D"font-family: times new roman, new york, times, serif;
 font-size: 12pt;"><div style=3D"font-family: times new roman, new york, tim=
es, serif; font-size: 12pt;"><font size=3D"2" face=3D"Arial"><hr size=3D"1">=
<b><span style=3D"font-weight:bold;">From:</span></b> Tracy &lt;<a href=3D"m=
ailto:rwstracy@gmail.com">rwstracy@gmail.com</a>&gt;<br><b><span style=3D"fo=
nt-weight: bold;">To:</span></b> Rotary motors in aircraft &lt;<a href=3D"ma=
ilto:flyrotary@lancaironline.net">flyrotary@lancaironline.net</a>&gt;<br><b>=
<span style=3D"font-weight: bold;">Sent:</span></b> Wednesday, September 14,=
 2011 4:43 PM<br><b><span style=3D"font-weight: bold;">Subject:</span></b> [=
FlyRotary] Re: The good news and the bad news......<br></font><br><div id=3D=
"yiv1768160512"><div>The relay is not needed in this hypothetical fix. &nbsp=
; The EC2/3 already has 2 CAS inputs. &nbsp;All that is needed is a hard def=
inition of sensor offset so the software can&nbsp;<span class=3D"yiv17681605=
12Apple-style-span" style=3D"">be written appropriately. &nbsp;( I'm assumin=
g a Renesis engine which has only one CAS in this
 discussion.)</span></div><div><br></div><div>The CAS output is an AC voltag=
e sine-wave that varies with engine speed. &nbsp; This is true for both Mazd=
a and Subaru engines (and almost all others). &nbsp; The sensor is a variabl=
e reluctor type. &nbsp;&nbsp;</div><div><br></div><div>Tracy<br><br>Sent fro=
m my iPad</div><div><br>On Sep 14, 2011, at 11:53 AM, Chad Robinson &lt;<a r=
el=3D"nofollow" ymailto=3D"mailto:crobinson@medialantern.com" target=3D"_bla=
nk" href=3D"mailto:crobinson@medialantern.com"><a href=3D"mailto:crobinson@m=
edialantern.com">crobinson@medialantern.com</a></a>&gt; wrote:<br><br></div>=
<div></div><blockquote type=3D"cite"><div>
    On 9/14/2011 1:48 PM, Al Wick wrote:
    <blockquote type=3D"cite">
     =20
     =20
      <style></style>
      <div>&lt;What kind of signal is on the CAS line</div>
      <div>If memory serves, it's 0 to 5vdc square wave. </div>
      <div>&nbsp;</div>
      <div>&lt;Could it go through a relay safely?</div>
      <div>Yes, but I'm not sure where you are going. You
        thinking&nbsp;normally closed contacts to OEM CAS, norm open to
        backup CAS? You still have to manage angle offset. Would be
        unfortunate to have moisture in relay or turbulence disrupt CAS.
        Likely not going to end up with safety improvement. Good
        creative idea though. </div>
    </blockquote>
    The rotary engine CAS is set up on a bracket near the front pulley.
    I was envisioning a system where you had a sensor in exactly the
    same spot on the other side of the toothed wheel. You might need an
    offset alternator pulley to make room for it - but then you don't
    have to worry about angles/offsets. It's just a second sensor, ready
    to go - flip a switch and try an engine restart. If relay
    reliability was a concern there are always SSRs or even just good
    switching transistors...<br>
    <br>
 =20

</div></blockquote></div><br><br></div></div></div></div></blockquote></body=
></html>=

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