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From: "Steven W. Boese" <SBoese@uwyo.edu>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Voltage fluctuation.
Thread-Topic: [FlyRotary] Voltage fluctuation.
Thread-Index: AQHNZwgAxla5w1r+y0eR/xogks487Jc0HWsO
Date: Sat, 21 Jul 2012 19:29:03 +0000
Message-ID: <3E8191F276108F4481AB0721BBA9269E05C66DF2@ponyexpress-m10.uwyo.edu>
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Bill,



I don't have an EM-2, but I log the bus voltage (among other things) every =
3 seconds on every flight with a data logger of my own design.  On a 1.5 hr=
 flight today, the bus voltge slowly drifted from 13.6 to 14.0 which seems =
to correlate to the under cowl temperature.  The short term variation as in=
dicated from one reading to the next is 0.1 volt or less.  The majority of =
the time, the voltage was 13.8 to 14.0.  This is with a stock 1986 RX7 inte=
rnally regulated alternator, a single PC680 battery, and the normal engine =
support systems and strobes operating.





Steve Boese
RV6A, 1986 13B NA, RD1A, EC2
________________________________
From: Rotary motors in aircraft [flyrotary@lancaironline.net] on behalf of =
Bill Bradburry [bbradburry@bellsouth.net]
Sent: Saturday, July 21, 2012 12:13 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Voltage fluctuation.

How solid should the buss voltage reading be on the EM-2?  My voltage seems=
 to float over about a half volt.  I don=92t know if there is something wro=
ng with my voltage regulator or if this is normal.  What do you guys see?

Bill B

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10pt;">
<p>Bill,</p>
<p>&nbsp;</p>
<p>I don't have an EM-2, but I log the bus voltage (among other things) eve=
ry 3 seconds on every flight with a data logger of my own design.&nbsp; On =
a 1.5 hr flight today, the bus voltge slowly drifted from 13.6 to 14.0 whic=
h seems to correlate to the under cowl
 temperature.&nbsp; The short term variation as indicated from one reading =
to the next is 0.1 volt or less.&nbsp; The majority of the time, the voltag=
e was 13.8 to 14.0.&nbsp; This is with a stock 1986 RX7 internally regulate=
d alternator, a single PC680 battery, and the normal
 engine support systems&nbsp;and strobes operating.</p>
<p>&nbsp;</p>
<div>
<p>&nbsp;</p>
<div><font size=3D"2" face=3D"Tahoma">
<div><font size=3D"2" face=3D"tahoma">Steve Boese</font></div>
<div><font size=3D"2" face=3D"tahoma">RV6A, 1986 13B NA, RD1A, EC2</font></=
div>
</font></div>
</div>
<div style=3D"FONT-FAMILY: Times New Roman; COLOR: #000000; FONT-SIZE: 16px=
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<div style=3D"DIRECTION: ltr" id=3D"divRpF439051"><font color=3D"#000000" s=
ize=3D"2" face=3D"Tahoma"><b>From:</b> Rotary motors in aircraft [flyrotary=
@lancaironline.net] on behalf of Bill Bradburry [bbradburry@bellsouth.net]<=
br>
<b>Sent:</b> Saturday, July 21, 2012 12:13 AM<br>
<b>To:</b> Rotary motors in aircraft<br>
<b>Subject:</b> [FlyRotary] Voltage fluctuation.<br>
</font><br>
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<p class=3D"MsoNormal"><font size=3D"2" face=3D"Arial"><span style=3D"FONT-=
FAMILY: Arial; FONT-SIZE: 10pt">How solid should the buss voltage reading b=
e on the EM-2?&nbsp; My voltage seems to float over about a half volt.&nbsp=
; I don=92t know if there is something wrong with my
 voltage regulator or if this is normal.&nbsp; What do you guys see?</span>=
</font></p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Arial"><span style=3D"FONT-=
FAMILY: Arial; FONT-SIZE: 10pt"></span></font>&nbsp;</p>
<p class=3D"MsoNormal"><font size=3D"2" face=3D"Arial"><span style=3D"FONT-=
FAMILY: Arial; FONT-SIZE: 10pt">Bill B</span></font></p>
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