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I agree. I also agree that most pattern flyers are reasonably
cautious and reasonably informed.<br>
<br>
There are many facets to a safe operation and most of us follow most
of them. Any accident is a combination of at least two errors at the
same time. <br>
Personally I use an arming plug or an external bullet, as much for
convenience on the flight line as anything else. I also make sure my
failsafe is doing the right thing. I also use a throttle cut which
is always on unless taxiing, testing or flying. I also keep my thumb
holding the throttle in a retarded position. I suppose it is
possible to still cause a problem but I feel I've taken all the
steps I can to prevent it.<br>
But individual examples of safe or safer operation are beside the
point. I am almost always behind or beside my model pre and post
flight. However I may be in front of someone has decided that a
throttle cut alone, used sparingly, is good enough for him. It's not
good enough for me when my body is on the line because he is
convinced his process is safe enough. Not many of these guys but all
it takes is one.<br>
I keep noting that there are two rules proposals on the table for
the CB to consider. One requires a physical connect/disconnect but
does not require external evidence of disconnection. Personally I
feel this does not go far enough. The second requires a failsafe
check which is the more important of the two rule proposals.<br>
As the subject says, this is about arming plugs but it really should
be about general flight line safety and what we can do to promote
it. You haven't seen any rules like the ones that would generated be
after a mishap that sends a 3000 watt electric slicing machine
careening into a crowd of people. Just because it hasn't happened,
sometime it will and when it does we, the hobby, had best be able to
show that good safety rules were in effect. Safety rules like the
ones we are proposing and will hopefully continue to evolve are
intended to increase the MTBF(mean time between failure), hopefully
to a point where the only remotely possible problem would be due to
a willful disregard of the rules. <br>
<br>
Cheers<br>
John<br>
<br>
<div class="moz-cite-prefix">On 5/18/2015 7:09 PM, Dave Lockhart
wrote:<br>
</div>
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">John,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">My
point was simply that “safe” is a relative term. Adding an
arming plug requirement, or a physical disconnect
requirement does not make a plane “safe”. Safer in some
instances, but with an additional failure point. Most of
the safety concerns / accidents / near misses, etc, I have
witnessed would not have been any different if an arming
plug was in use.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">So
far as failsafe, it also won’t make an airplane “safe”, but,
from my experience, if fail safe checks were implemented,
that would do more to make the airplanes safe than adding an
arming plug.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Dave<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">
John Gayer [<a class="moz-txt-link-freetext" href="mailto:jgghome@comcast.net">mailto:jgghome@comcast.net</a>] <br>
<b>Sent:</b> Sunday, May 17, 2015 11:48 PM<br>
<b>To:</b> Dave Lockhart; General pattern discussion<br>
<b>Subject:</b> Re: [NSRCA-discussion] Arming device<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">So...since no
safety rule can totally prevent accidents, we should have
none?<br>
I suppose you are against seatbelts, airbags and helmets
because they don't prevent all vehicle deaths?<br>
<br>
I don't see the point in conjuring up ridiculous rule
possibilities to put down reasonable safety rules.<br>
Failsafe checks are intended to be educational rather than
punitive so where's the harm?<br>
Also, there is no rule being proposed that mandates any arming
system at all but you must demonstrate a physical disconnect
of the motor battery. I consider an arming plug/connection to
be by far the easiest and safest way to satisfy the proposed
rule.<br>
<br>
John<o:p></o:p></p>
<div>
<p class="MsoNormal">On 5/17/2015 11:47 AM, Dave Lockhart via
NSRCA-discussion wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">So…..if
we mandate arming systems….our airplanes will no longer be
capable of causing carnage?</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Maybe
we should require all planes have an impact absorbing foam
spinner and a shroud around the prop to make sure the
spinning thing on front can’t cut anyone? Of course the
kinetic energy of the moving plane will still be
substantial enough to cause carnage….so maybe a
combination of speed and weight limit to restrict the
kinetic energy level to a point that it is deemed “safe”?</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Accidents
are accidents….and more likely to happen when safe
procedures are not followed. Our airplanes will always be
dangerous and capable of causing carnage….just like the
cars we drive to the field in.</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Requiring
the fail safe be demonstrated is a far better idea….but it
still won’t protect against someone bumping the throttle
stick of an airplane that passes a fail safe check and has
an arming system in it. To my recollection, I’d say about
20% of the fail safe checks at the 2011 WC were not
successful on the first attempt….and a surprising number
of the pilots needed assistance programming there radio to
make the failsafe work.</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Regards,</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Dave</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<div>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
NSRCA-discussion [<a moz-do-not-send="true"
href="mailto:nsrca-discussion-bounces@lists.nsrca.org">mailto:nsrca-discussion-bounces@lists.nsrca.org</a>]
<b>On Behalf Of </b>Ronald Van Putte via
NSRCA-discussion<br>
<b>Sent:</b> Sunday, May 17, 2015 1:09 PM<br>
<b>To:</b> General pattern discussion<br>
<b>Subject:</b> Re: [NSRCA-discussion] Arming device</span><o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Yeah! Even if we are capable of causing
carnage with our unsafe airplane, it’s nobody else’s
business. Don’t mess with my airplane! <o:p></o:p></p>
<div>
<p class="MsoNormal"> <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Ron (with tongue in cheek)<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"> <o:p></o:p></p>
<div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal">On May 17, 2015, at 11:30 AM,
Keith Hoard via NSRCA-discussion <<a
moz-do-not-send="true"
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>>
wrote:<o:p></o:p></p>
</div>
<p class="MsoNormal"> <o:p></o:p></p>
<div>
<div>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Pattern
is turning into a box checking, over-regulated
government operation.<br>
<br>
-Keith Hoard<br>
-Sent from my Windows Phone</span><o:p></o:p></p>
</div>
</div>
<div>
<div class="MsoNormal" style="text-align:center"
align="center"><span
style="font-size:10.5pt;font-family:ArialMS">
<hr align="center" size="3" width="100%"></span></div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:<span
class="apple-converted-space"> </span></span></b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><a
moz-do-not-send="true"
href="mailto:nsrca-discussion@lists.nsrca.org">Vicente
Bortone via NSRCA-discussion</a></span><span
style="font-size:10.5pt;font-family:ArialMS"><br>
</span><b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Sent:<span
class="apple-converted-space"> </span></span></b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif"">5/17/2015
9:04</span><span
style="font-size:10.5pt;font-family:ArialMS"><br>
</span><b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif"">To:<span
class="apple-converted-space"> </span></span></b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif""><a
moz-do-not-send="true"
href="mailto:k6xyz@sbcglobal.net">David Harmon</a>;<span
class="apple-converted-space"> </span><a
moz-do-not-send="true"
href="mailto:nsrca-discussion@lists.nsrca.org">General
pattern discussion</a></span><span
style="font-size:10.5pt;font-family:ArialMS"><br>
</span><b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Subject:<span
class="apple-converted-space"> </span></span></b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif"">[NSRCA-discussion]
Arming device</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span
style="font-size:10.5pt;font-family:ArialMS">TAG
IN.....<br>
<br>
Hi Dave,<br>
<br>
I started to do that in my contest in Kansas
City last year. This year in pilot meeting I
said. " If you don't do it the first round will
be zeroed. Well I think worked well"<br>
<br>
John F.<br>
<br>
You just made my day. I do more or less the same
you do. I review a lot of projects. Clearly will
all here analyzed the system and we know the
steps could be used to mitigate a possible
situation. That is the end of discussion in
cases like this. Just give me a real possibility
of tag in and tag out.<br>
<br>
Jon,<br>
<br>
Good research. Now you have to find what is the
code that applies to model airplanes. I knew
that there is no one specific code. However
existing codes applies for similar systems. If
all if them arrives to the same conclusion we
will be in better shape if we just follow the
intent of all codes you can find. Now try to
find the specifics for a system similar to the
one we have. I already know the answer so I
don't need to ask our friend Google.<br>
<br>
TAG OUT<span class="apple-converted-space"> </span></span><o:p></o:p></p>
<div>
<p class="MsoNormal"><span
style="font-size:10.5pt;font-family:ArialMS"><br>
<br>
On Saturday, May 16, 2015, David Harmon via
NSRCA-discussion <<a moz-do-not-send="true"
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>>
wrote:</span><o:p></o:p></p>
</div>
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<p class="MsoNormal"><span
style="font-size:10.5pt;font-family:ArialMS">With
as much talk that has gone on and on
andonandonandonandon about this<br>
arming device......puff..puff....not much
percentage.<br>
Especially when it is so easy to check.....<br>
Before the first takeoff of each pilot on
the first round....the helper<br>
holds the plane off the ground and the pilot
turns off the transmitter.<br>
The judges can verify that the motor does
not start.<br>
Easy....no drama.<br>
<br>
Oh wait....this was never done with
glow....but I HAVE seen several guys<br>
chawed up by a howling YS.<br>
One time a guys airplane chased him in a
circle as he was trying to catch<br>
it...he had one leg in front of one wing and
for an old guy he moved pretty<br>
quick.<br>
I can't describe how long I laughed about
that incident.<br>
<br>
In the end....my opinion is checking the
fail-safe function should be a must<br>
at each contest.<br>
<br>
David Harmon<br>
Sperry, OK<br>
<br>
-----Original Message-----</span><o:p></o:p></p>
</blockquote>
</div>
<div>
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<p class="MsoNormal"><span
style="font-size:10.5pt;font-family:ArialMS">From:
NSRCA-discussion [<a moz-do-not-send="true"
href="mailto:nsrca-discussion-bounces@lists.nsrca.org">mailto:</a><a
moz-do-not-send="true"
href="mailto:nsrca-discussion-bounces@lists.nsrca.org">nsrca-discussion-bounces@lists.nsrca.org</a>]
On</span><o:p></o:p></p>
</blockquote>
</div>
<div>
<blockquote style="border:none;border-left:solid
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<p class="MsoNormal"><span
style="font-size:10.5pt;font-family:ArialMS">Behalf
Of Ron Van Putte via NSRCA-discussion<br>
Sent: Saturday, May 16, 2015 4:58 PM</span><o:p></o:p></p>
</blockquote>
</div>
<div>
<blockquote style="border:none;border-left:solid
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<p class="MsoNormal"
style="margin-bottom:12.0pt"><span
style="font-size:10.5pt;font-family:ArialMS"><br>
To: General pattern discussion<br>
Subject: Re: [NSRCA-discussion] Arming
device</span><o:p></o:p></p>
</blockquote>
</div>
<div>
<blockquote style="border:none;border-left:solid
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<p class="MsoNormal"><span
style="font-size:10.5pt;font-family:ArialMS">I
have seen too many situations where an ID10T
error caused serious damage<br>
that would have been precluded by the use of
a shorting plug.<br>
<br>
What percentage of pilots’ transmitters
would fail the fail safe test?<br>
Anybody?<br>
<br>
Ron Van Putte<br>
<br>
On May 16, 2015, at 4:08 PM, Whodaddy
Whodaddy via NSRCA-discussion<br>
<<a moz-do-not-send="true"
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>>
wrote:<br>
<br>
> Seems like we have to many people with
to much time on their hands sitting<br>
around fantasizing about what might happen
if .... Really.... if u cant<br>
control the aircraft in all aspects then u
prolly shouldn't have one... Let<br>
alone legislate what i need to be doing with
mine...<br>
><br>
><br>
> Gary<br>
></span><o:p></o:p></p>
</blockquote>
</div>
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<p class="MsoNormal"><span
style="font-size:10.5pt;font-family:ArialMS">>
Sent from my iPhone<br>
></span><o:p></o:p></p>
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<p class="MsoNormal"><span
style="font-size:10.5pt;font-family:ArialMS"> </span><o:p></o:p></p>
</blockquote>
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<div>
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<p class="MsoNormal"><span
style="font-size:10.5pt;font-family:ArialMS">>>
On May 16, 2015, at 3:58 PM, Jon Lowe via
NSRCA-discussion</span><o:p></o:p></p>
</blockquote>
</div>
<div>
<blockquote style="border:none;border-left:solid
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<p class="MsoNormal"><span
style="font-size:10.5pt;font-family:ArialMS"><<a
moz-do-not-send="true"
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>>
wrote:<br>
>><br>
>> Code doesn't apply to model
airplanes. Cars do not disconnect the<br>
battery, except on race cars with a
disconnect switch in case of a wreck.<br>
Normal road cars do not, and modern cars
leave a lot of things connected<br>
when the ignition is off. A lot of cars
have underhood fans that run for<br>
awhile after the car is shut off.<br>
>><br>
>> If this was a big issue, AMA would
address it with all model aircraft,<br>
not just pattern. Electric is common in
helis, controline, etc. We are over<br>
killing this something awful.<br>
>><br>
>> Jon<br>
>><br>
>>> On May 16, 2015 2:11 PM,
Vicente Bortone via NSRCA-discussion<br>
<<a moz-do-not-send="true"
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>>
wrote:<br>
>>><br>
>>> the ignition switch.<br>
>>><br>
>>>> On Saturday, May 16, 2015,
Vicente Bortone <<a
moz-do-not-send="true"
href="mailto:vincebrc@gmail.com">vincebrc@gmail.com</a>>
wrote:<br>
>>>><br>
>>>><br>
>>>><br>
>>>>> On Saturday, May 16,
2015, Del R via NSRCA-discussion<br>
<<a moz-do-not-send="true"
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>>
wrote:<br>
>>>>><br>
>>>>> The nice thing about
being brought up around GUNS.. It teaches<br>
>>>>> people to respect it
always as though it is loaded and cocked<br>
>>>>> ready to deliver its
physical life altering energy!!!.. < tic
><br>
>>>>><br>
>>>>><br>
>>>>>><br>
>>>>>> ----- Original
Message -----<br>
>>>>>> From: David Cook
via NSRCA-discussion<br>
>>>>>> To: Jim Woodward ;
General pattern discussion<br>
>>>>>> Sent: Saturday, May
16, 2015 10:48 AM<br>
>>>>>> Subject: Re:
[NSRCA-discussion] Arming device<br>
>>>>>><br>
>>>>>> Just to open the
can of worms from the other end.<br>
>>>>>> Now that I have
seen the damage a runaway can do to a pool
table even<br>
with an external arming device, I have begun
to make it a common practice to<br>
remove the prop from the electric planes any
time I am not at the field<br>
flying. Store the ammunition and the pin
under two different locks. How easy<br>
is it to be careless in the shop or
transporting a plane. This thread could<br>
just explode with stories of mishaps we have
made or come way too close to.<br>
>>>>>> You just can't be
too carful with these things!!!<br>
>>>>>> DC<br>
>>>>>><br>
>>>>>>> On Sat, May 16,
2015 at 10:21 AM, Jim Woodward via
NSRCA-discussion<br>
<<a moz-do-not-send="true"
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>>
wrote:<br>
>>>>>>><br>
>>>>>>> ... Going
electric induces a mental physchosis that
requires<br>
>>>>>>> everyone else
to switch, then go and change the rules for
glow<br>
>>>>>>> :)<br>
>>>>>>><br>
>>>>>>> Sent from my
iPhone<br>
>>>>>>><br>
>>>>>>>> On May 16,
2015, at 9:38 AM, Keith Hoard via
NSRCA-discussion<br>
<<a moz-do-not-send="true"
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>>
wrote:<br>
>>>>>>>><br>
>>>>>>>> I think the
YS guys should have their caller remove the
fuel tank<br>
and glow plug before picking up the plane
and exiting the runway . . .<br>
>>>>>>>><br>
>>>>>>>><br>
>>>>>>>><br>
>>>>>>>> From:
NSRCA-discussion<br>
>>>>>>>> [<a
moz-do-not-send="true"
href="mailto:nsrca-discussion-bounces@lists.nsrca.org">mailto:</a><a
moz-do-not-send="true"
href="mailto:nsrca-discussion-bounces@lists.nsrca.org">nsrca-discussion-bounces@lists.nsrca.org</a>]
On Behalf Of<br>
>>>>>>>>
precisionaero via NSRCA-discussion<br>
>>>>>>>> Sent:
Saturday, May 16, 2015 8:38 AM<br>
>>>>>>>> To: General
pattern discussion<br>
>>>>>>>> Subject:
Re: [NSRCA-discussion] Arming device<br>
>>>>>>>><br>
>>>>>>>><br>
>>>>>>>><br>
>>>>>>>> I think we
should reconfigure a YS engine to drive a
generator to<br>
supply electricity to the electric motor.<br>
>>>>>>>><br>
>>>>>>>><br>
>>>>>>>><br>
>>>>>>>><br>
>>>>>>>><br>
>>>>>>>> Sent via
the Samsung Galaxy S™ III, an AT&T 4G
LTE smartphone<br>
>>>>>>>><br>
>>>>>>>><br>
>>>>>>>><br>
>>>>>>>> --------
Original message --------<br>
>>>>>>>><br>
>>>>>>>> From: Peter
Vogel via NSRCA-discussion<br>
>>>>>>>><br>
>>>>>>>>
Date:05/16/2015 09:31 (GMT-05:00)<br>
>>>>>>>><br>
>>>>>>>> To: General
pattern discussion ,<span
class="apple-converted-space"> </span><a
moz-do-not-send="true"
href="mailto:ronlock@comcast.net">ronlock@comcast.net</a>,
David<br>
>>>>>>>><br>
>>>>>>>> Subject:
Re: [NSRCA-discussion] Arming device<br>
>>>>>>>><br>
>>>>>>>><br>
>>>>>>>><br>
>>>>>>>> I think
we're all in agreement, which is why the
rules proposal we<br>
put forth requires a *physical* break in the
circuit!<br>
>>>>>>>><br>
>>>>>>>> Sent from
Outlook<br>
>>>>>>>><br>
>>>>>>>><br>
>>>>>>>><br>
>>>>>>>><br>
>>>>>>>><br>
>>>>>>>>> On Sat,
May 16, 2015 at 6:16 AM -0700, "ronlock---
via<br>
NSRCA-discussion" <<a
moz-do-not-send="true"
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>>
wrote:<br>
>>>>>>>>><br>
>>>>>>>>> I'm in
agreement.<br>
>>>>>>>>><br>
>>>>>>>>> Ron
Lockhart<br>
>>>>>>>>><br>
>>>>>>>>><br>
>>>>>>>>><br>
>>>>>>>>>
________________________________<br>
>>>>>>>>><br>
>>>>>>>>> From:
"David via NSRCA-discussion"<br>
>>>>>>>>> <<a
moz-do-not-send="true"
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>><br>
>>>>>>>>> To:<span
class="apple-converted-space"> </span><a
moz-do-not-send="true"
href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a><br>
>>>>>>>>> Sent:
Saturday, May 16, 2015 1:14:21 AM<br>
>>>>>>>>>
Subject: [NSRCA-discussion] Arming device<br>
>>>>>>>>><br>
>>>>>>>>><br>
>>>>>>>>><br>
>>>>>>>>> I'm not
trying to bring up a sore subject but this
has been<br>
bugging me since it was up a while back. I
am the senior electronics<br>
technician in the plasma physics department
at the University of Wisconsin.<br>
About a third of what I do is make interlock
circuits for the Madison<br>
Symmetric Torus. I know that the best way of
keeping things safe is to<br>
remove the potential energy from a circuit
to keep bad things from<br>
happening. The problem with depending on a
circuit such as the emcotec type<br>
of disconnect or to just relying solely on
the radio and ESC to keep things<br>
safe is failure modes. You can plan for all
different failure types but to<br>
make it a circuit that isn't a lead brick
being added to the plane there are<br>
compromises that have to be made. This leads
to designing systems that may<br>
deal with only the most common types of
failures. For example most common<br>
diodes and tantalum capacitors usually fail
in a shorted mode, but not<br>
always. Many carbon resistors will decrease
in résistance just prior to<br>
opening up. You get the idea, there are just
so many possibilities and<br>
combinations that in my opinion the only
real way to safe a power system is<br>
to disconnect the energy source. Ok, now I
feel better that I said<br>
something.<br>
>>>>>>>>><br>
>>>>>>>>><br>
>>>>>>>>><br>
>>>>>>>>> David<br>
>>>>>>>>><br>
>>>>>>>>><br>
>>>>>>>>><br>
>>>>>>>>><br>
>>>>>>>>>
_______________________________________________<br>
>>>>>>>>>
NSRCA-discussion mailing list<br>
>>>>>>>>><span
class="apple-converted-space"> </span><a
moz-do-not-send="true"
href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a><br>
>>>>>>>>><span
class="apple-converted-space"> </span><a
moz-do-not-send="true"
href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion"
target="_blank">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a><br>
>>>>>>>><br>
>>>>>>>>
_______________________________________________<br>
>>>>>>>>
NSRCA-discussion mailing list<br>
>>>>>>>><span
class="apple-converted-space"> </span><a
moz-do-not-send="true"
href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a><br>
>>>>>>>><span
class="apple-converted-space"> </span><a
moz-do-not-send="true"
href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion"
target="_blank">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a><br>
>>>>>>><br>
>>>>>>><br>
>>>>>>>
_______________________________________________<br>
>>>>>>>
NSRCA-discussion mailing list<br>
>>>>>>><span
class="apple-converted-space"> </span><a
moz-do-not-send="true"
href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a><br>
>>>>>>><span
class="apple-converted-space"> </span><a
moz-do-not-send="true"
href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion"
target="_blank">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a><br>
>>>>>><br>
>>>>>><br>
>>>>>>
________________________________<br>
>>>>>><br>
>>>>>>
_______________________________________________<br>
>>>>>> NSRCA-discussion
mailing list<br>
>>>>>><span
class="apple-converted-space"> </span><a
moz-do-not-send="true"
href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a><br>
>>>>>><span
class="apple-converted-space"> </span><a
moz-do-not-send="true"
href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion"
target="_blank">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a><br>
>>>><br>
>>>><br>
>>>><br>
>>>> --<br>
>>>> Vicente "Vince" Bortone<br>
>>><br>
>>><br>
>>><br>
>>> --<br>
>>> Vicente "Vince" Bortone<br>
>>
_______________________________________________<br>
>> NSRCA-discussion mailing list<br>
>><span class="apple-converted-space"> </span><a
moz-do-not-send="true"
href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a><br>
>><span class="apple-converted-space"> </span><a
moz-do-not-send="true"
href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion"
target="_blank">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a><br>
>
_______________________________________________<br>
> NSRCA-discussion mailing list<br>
><span class="apple-converted-space"> </span><a
moz-do-not-send="true"
href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a><br>
><span class="apple-converted-space"> </span><a
moz-do-not-send="true"
href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion"
target="_blank">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a><br>
<br>
_______________________________________________<br>
NSRCA-discussion mailing list<br>
<a moz-do-not-send="true"
href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a><br>
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href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion"
target="_blank">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a><br>
<br>
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NSRCA-discussion mailing list<br>
<a moz-do-not-send="true"
href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a><br>
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href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion"
target="_blank">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a></span><o:p></o:p></p>
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<p class="MsoNormal"><Mail Attachment.txt><span
style="font-size:10.5pt;font-family:ArialMS">_______________________________________________<br>
NSRCA-discussion mailing list<br>
</span><a moz-do-not-send="true"
href="mailto:NSRCA-discussion@lists.nsrca.org"><span
style="font-size:10.5pt;font-family:ArialMS">NSRCA-discussion@lists.nsrca.org</span></a><span
style="font-size:10.5pt;font-family:ArialMS"><br>
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href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion"><span
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<pre>_______________________________________________<o:p></o:p></pre>
<pre>NSRCA-discussion mailing list<o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a><o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a><o:p></o:p></pre>
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