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Date: Mon, 21 Sep 2009 10:32:24 -0500
Message-ID: <5cf132c0909210832n202e7b8sad3b2960e29e24c@mail.gmail.com>
Subject: Re: [FlyRotary] Re: Progress report from Houston
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Content-Type: multipart/alternative; boundary=001636c5b63e413404047418300d

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Bill,

I just ran a separate ground wire from one of the screws on the instrument
sub-panel to the forest of tabs.  It makes a lot of sense as the sub panel
is mounted on a fiberglass frame, essentially insulating it from the rest o=
f
the airplane.  Who knows how the ground path was completed.  It probably
wouldn't have hurt a thing to do the same with the other two sub panels.

Mark

On Mon, Sep 21, 2009 at 10:15 AM, Bill Bradburry
<bbradburry@bellsouth.net>wrote:

>    Mark,
>
> I copied the below from an msg from you last Oct..  Which pin on the PCM
> did you connect to ground?  The only pin I can find in the instructions f=
or
> the PCM that is identified as ground is pin 1 which is called out to be
> connected to pin 16 on the Controller?  Did you splice this wire to groun=
d
> or did you connect a different pin on the PCM?
>
>
>
> =93  Keep in mind that I had some data corruption problems similar to Al
> Gietzen.  It seems to be a problem with fiberglass airplanes, so don't be
> surprised if you experience this too.  With me, it always  happened while=
 on
> the ground.  Last time it happened, I looked at each of the 3 tables and =
saw
> that only one was actually corrupted, so it is possible that it may have
> happened in the air, but since I was running above 3800 rpm (and operatin=
g
> in the upper table), I didn't notice any difference.  Nobody really knows
> what causes this problem, but I seem to have fixed it by running a separa=
te
> ground from the PCM to the forest-of-tabs ground.  The thought was that t=
he
> sub-panel was mounted on a fiberglass frame and therefore was isolated fr=
om
> ground.  I have not had an episode since I added the ground.=94
>
>
>
> Bill B
>

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<div>Bill, </div>
<div>=A0</div>
<div>I just ran a=A0separate ground wire from one of the screws on the inst=
rument sub-panel to the forest of tabs.=A0 It makes a lot of sense as the s=
ub panel is mounted on a fiberglass frame, essentially insulating it from t=
he rest of the airplane.=A0 Who knows=A0how the=A0ground path was completed=
.=A0 It probably wouldn&#39;t have hurt a thing to do the same with the oth=
er two sub panels.=A0 =A0=A0</div>

<div>=A0</div>
<div>Mark=A0<br><br></div>
<div class=3D"gmail_quote">On Mon, Sep 21, 2009 at 10:15 AM, Bill Bradburry=
 <span dir=3D"ltr">&lt;<a href=3D"mailto:bbradburry@bellsouth.net">bbradbur=
ry@bellsouth.net</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"PADDING-LEFT: 1ex; MARGIN: 0px 0=
px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div lang=3D"EN-US" vlink=3D"blue" link=3D"blue">
<div>
<div>
<p><font face=3D"Times New Roman" size=3D"3"><span style=3D"FONT-SIZE: 12pt=
">=A0Mark,</span></font></p>
<p><font face=3D"Times New Roman" size=3D"3"><span style=3D"FONT-SIZE: 12pt=
">I copied the below from an msg from you last Oct..=A0 Which pin on the PC=
M did you connect to ground?=A0 The only pin I can find in the instructions=
 for the PCM that is identified as ground is pin 1 which is called out to b=
e connected to pin 16 on the Controller?=A0 Did you splice this wire to gro=
und or did you connect a different pin on the PCM?</span></font></p>

<p><font face=3D"Times New Roman" size=3D"3"><span style=3D"FONT-SIZE: 12pt=
">=A0</span></font></p>
<p><font face=3D"Times New Roman" size=3D"3"><span style=3D"FONT-SIZE: 12pt=
">=93 =A0Keep in mind that I had some data corruption problems similar to A=
l Gietzen.=A0 It seems to be a problem with fiberglass airplanes, so don&#3=
9;t be surprised if you experience this too.=A0 With me, it always=A0 happe=
ned while on the ground.=A0 Last time it happened, I looked at each of the =
3 tables and saw that only one was actually corrupted, so it is possible th=
at it may have happened in the air, but since I was running above 3800 rpm =
(and operating in the upper table), I didn&#39;t notice any difference.=A0 =
Nobody really knows what causes this problem, but I seem to have fixed it b=
y running a separate ground from the PCM to the forest-of-tabs ground.=A0 T=
he thought was that the sub-panel was mounted on a fiberglass frame and the=
refore was isolated from ground.=A0 I have not had an episode since I added=
 the ground.=94</span></font></p>

<p><font face=3D"Times New Roman" size=3D"3"><span style=3D"FONT-SIZE: 12pt=
">=A0</span></font></p>
<p><font face=3D"Times New Roman" size=3D"3"><span style=3D"FONT-SIZE: 12pt=
">Bill B</span></font></p></div></div></div></blockquote></div><br>

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