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<p class=MsoNormal><span class=EmailStyle18><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'>I don't
fly electric in competition (yet) but I setup the TX the same as my glow
airplanes using the throttle cut function, which disables the stick on my
SD-10G, preventing accidentally bumping it and energizing the motor. Since I'm BESC
the airplane is restrained when plugging in the battery and I still turn on the
TX first, mostly out of habit. <o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle18><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'><span
style="mso-spacerun: yes"> </span><o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle18><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'>After
landing there are usually bystanders gathering around asking questions and I explain
that I need to unplug the battery to be safe before engaging in Q&A. I
guess I just don't trust it any more than a still running motor.<o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle18><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle18><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'>In a
competition airplane I would use an arming plug as some of you already do.<o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle18><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'>Jim<o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle18><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=EmailStyle18><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial'><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></font></span></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color=black
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;color:black'>-----Original
Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org]<b><span style='font-weight:
bold'>On Behalf Of </span></b>Peter Vogel<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, February 13, 2012
7:31 AM<br>
<b><span style='font-weight:bold'>To:</span></b> General pattern discussion<br>
<b><span style='font-weight:bold'>Cc:</span></b> General pattern discussion<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [NSRCA-discussion]
Arming Switch</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'>From the
accidents I've seen or heard of, the issue is not a failure before takeoff, but
rather a failure after landing (ESC already armed) or a pilot mishap that
results in an unintentional bump of the throttle lever (neck strap, coat, etc)</span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'><![if !supportEmptyParas]> <![endif]></span></font><font
color=black><span style='color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'>Peter+<br>
<br>
Sent from my iPhone4S</span></font><font color=black><span style='color:black;
mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:
12.0pt;margin-left:.5in'><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black'><br>
On Feb 13, 2012, at 7:18 AM, Bob Richards <<a href="mailto:bob@toprudder.com">bob@toprudder.com</a>>
wrote:</span></font><font color=black><span style='color:black;mso-color-alt:
windowtext'><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 color=black face=inherit><span
style='font-size:12.0pt;font-family:inherit;color:black'>Keith,</span></font><font
color=black face=inherit><span style='font-family:inherit;color:black;
mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face=inherit><span
style='font-size:12.0pt;font-family:inherit;color:black'> </span></font><font
color=black face=inherit><span style='font-family:inherit;color:black;
mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face=inherit><span
style='font-size:12.0pt;font-family:inherit;color:black'>My gut instinct
is to agree with you on this, but I have to wonder what is the possibility
that there would be a failure mode where the controller could go full
throttle without an input from the receiver. For the brushless controllers,
the micro in the controller must be working properly for the motor to run -
period - since it has to sense the feedback from the motor and operate the
outputs in proper phase for the motor to run at all (this would be a
different discussion if we were talking about *brushed* controllers). The
more likely failure would be that it applies power to one or more motor wires
- not pulsed - that would do little more than heat up the motor and burn a
winding, but not turn the motor over.</span></font><font color=black
face=inherit><span style='font-family:inherit;color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face=inherit><span
style='font-size:12.0pt;font-family:inherit;color:black'> </span></font><font
color=black face=inherit><span style='font-family:inherit;color:black;
mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face=inherit><span
style='font-size:12.0pt;font-family:inherit;color:black'>Is it possible for
the micro think there is a full-throttle input when there isn't? Most
controllers that I know of will not arm if it powers up with anything other
than a low-throttle signal from the receiver. It has to sense a low-throttle
signal that then transitions to something else before it starts the motor
turning. Is this a possible failure mode for an ESC - I don't know since I
don't know any specifics of the circuitry or firmware programming of ESCs,
but I seriously doubt this can happen and if it can, the likelyhood would be
extremely low.</span></font><font color=black face=inherit><span
style='font-family:inherit;color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face=inherit><span
style='font-size:12.0pt;font-family:inherit;color:black'> </span></font><font
color=black face=inherit><span style='font-family:inherit;color:black;
mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face=inherit><span
style='font-size:12.0pt;font-family:inherit;color:black'>Of course, not
having the battery connected to anything is safe. Safer yet is to just stay
at home, but we have to decide what is an acceptable risk.</span></font><font
color=black face=inherit><span style='font-family:inherit;color:black;
mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face=inherit><span
style='font-size:12.0pt;font-family:inherit;color:black'> </span></font><font
color=black face=inherit><span style='font-family:inherit;color:black;
mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face=inherit><span
style='font-size:12.0pt;font-family:inherit;color:black'>Bob R.</span></font><font
color=black face=inherit><span style='font-family:inherit;color:black;
mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face=inherit><span
style='font-size:12.0pt;font-family:inherit;color:black'> </span></font><font
color=black face=inherit><span style='font-family:inherit;color:black;
mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face=inherit><span
style='font-size:12.0pt;font-family:inherit;color:black'> </span></font><font
color=black face=inherit><span style='font-family:inherit;color:black;
mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=black face=inherit><span
style='font-size:12.0pt;font-family:inherit;color:black'><br>
<br>
--- On <b><span style='font-weight:bold'>Sun, 2/12/12, Keith Black <i><span
style='font-style:italic'><<a href="mailto:tkeithblack@gmail.com">tkeithblack@gmail.com</a>></span></i></span></b>
wrote:</span></font><font color=black face=inherit><span style='font-family:
inherit;color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<div style='border:none;border-left:solid #1010FF 1.5pt;padding:0in 0in 0in 4.0pt'>
<p class=MsoNormal style='margin-right:.5in;mso-margin-top-alt:auto;
margin-bottom:12.0pt;margin-left:3.75pt;border:none;mso-border-left-alt:solid #1010FF 1.5pt;
padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><font size=3 color=black
face=inherit><span style='font-size:12.0pt;font-family:inherit;color:black'><![if !supportEmptyParas]> <![endif]></span></font><font
color=black face=inherit><span style='font-family:inherit;color:black;
mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-right:.5in;mso-margin-top-alt:auto;
mso-margin-bottom-alt:auto;margin-left:3.75pt;border:none;mso-border-left-alt:
solid #1010FF 1.5pt;padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><font
size=3 color=black face=inherit><span style='font-size:12.0pt;font-family:
inherit;color:black'>
<div id=yiv2019939762>Dave, you're points are correct, but you're not taking
into account a malfunction of the speed controller itself. They have been
know to malfunction, so the safest approach, as Earl suggests, is to assume
that anytime the battery is connected to the controller the motor may go to
full throttle. Until you unplug the battery the thing is hot and dangerous
regardless of your fail safe or switches on the transmitter. </span></font><font
color=black face=inherit><span style='font-family:inherit;color:black;
mso-color-alt:windowtext'><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-right:.5in;mso-margin-top-alt:auto;
mso-margin-bottom-alt:auto;margin-left:3.75pt;border:none;mso-border-left-alt:
solid #1010FF 1.5pt;padding:0in;mso-padding-alt:0in 0in 0in 4.0pt'><![if !supportEmptyParas]> <![endif]><font
size=3 color=black face=inherit><span style='font-size:12.0pt;font-family:
inherit;color:black;mso-color-alt:windowtext'><o:p></o:p></span></font></p>
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