<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><DIV><SPAN style="FONT-SIZE: 11pt"><FONT face=Calibri>>>>The voltage in a battery is not the lethal element, current of Amperage is.<<<</FONT></SPAN></DIV>
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<DIV><SPAN style="FONT-SIZE: 11pt"><FONT size=4 face="times new roman, new york, times, serif">So are you saying that a 1 cell 5000mah pack is dangerous enough to kill 1000 people? :-)</FONT></SPAN></DIV>
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<DIV><SPAN style="FONT-SIZE: 11pt"><FONT size=4 face="times new roman, new york, times, serif">A 12v car battery can put out hundreds of amps. It does not kill anyone from electrocution since the human body is a terrible conductor (high resistance) and 12v is not enough voltage to cause a significant current to flow through human tissue. So, it takes a high enough voltage to overcome the resistance of the human body before enough current flows to cause problems.</FONT></SPAN></DIV>
<DIV><BR><FONT size=4 face="times new roman, new york, times, serif">On the other hand, a Tesla coil can produce over a 100k volts, but a person can touch it because there is so little current produced - not enough to hurt someone.</FONT></DIV>
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<DIV><FONT size=4 face="times new roman, new york, times, serif">It takes a source with a high enough potential (voltage) to overcome the human resistance, along with enough current capacity, before harm can be done.</FONT></DIV>
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<DIV><FONT size=4 face="Times New Roman">The exact values that can be considered dangerous can be debated. 50ma will not always be dangerous - it won't feel good, however. OTOH, less than 20ma under the right circumstances can be lethal.</FONT></DIV>
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<DIV><FONT size=4 face="Times New Roman">Bob R.</FONT></DIV>
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<DIV><BR>--- On <B>Thu, 8/19/10, Randall Bearden <I><rbearden56@bellsouth.net></I></B> wrote:<BR></DIV>
<BLOCKQUOTE style="BORDER-LEFT: rgb(16,16,255) 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px"><BR>
<DIV id=yiv866401968><FONT face="Calibri, Verdana, Helvetica, Arial"><SPAN style="FONT-SIZE: 11pt">The voltage in a battery is not the lethal element, current of Amperage is. I believe the voltage is to limit the number of cells that can be used for the power source. Each will have 3.6 volts so you can see that 11 cells in series can will have 39.6 volts. The number of cells in parallel will add up to the current you need for the engine to produce power. Letha current is about 50 mA or 0.05 Amps of current.<BR><BR>On 8/19/10 3:22 PM, "Atwood, Mark" <<A rel=nofollow>atwoodm@paragon-inc.com</A>> wrote:<BR><BR></SPAN></FONT>
<BLOCKQUOTE><FONT face="Calibri, Verdana, Helvetica, Arial"><SPAN style="FONT-SIZE: 11pt"><FONT color=#1f497d>I can’t answer the “checking” question, as I have never had mine checked, but I “think” I was told they did at the worlds. As to why the limit on voltage, that’s simply a safety issue. 40V dc is generally accepted as the threshold for non-lethal dc voltage. Your skins natural resistance will prevent enough current from going through you at that voltage to kill you (though as many have experienced, it can burn the crap out of your fingers). That said, if you had electrodes poked through the skin, it could still toast you. <BR> <BR>There has been talk about raising that limit to accommodate 12s batteries which FAI has done for the Heli F3C competitions. I doubt you’ll see it go above that. I’m actually surprised that the AMA hasn’t put an upper limit (or maybe they have
and I’m unaware) for the same safety reason.<BR> <BR>I can only imagine what a good old fashioned electrocution would do for our image. Big bird fun fry…<BR> <BR> <BR> <BR></FONT></SPAN></FONT><FONT size=2><FONT face="Verdana, Helvetica, Arial"><SPAN style="FONT-SIZE: 10pt"><B>Mark Atwood<BR></B></SPAN></FONT></FONT><FONT face="Verdana, Helvetica, Arial"><B><FONT size=1><SPAN style="FONT-SIZE: 9pt">Paragon Consulting, Inc.</SPAN></FONT></B><FONT size=1><SPAN style="FONT-SIZE: 9pt"> </SPAN></FONT><FONT size=2><SPAN style="FONT-SIZE: 10pt"><B>|</B></SPAN></FONT><FONT size=1><SPAN style="FONT-SIZE: 9pt"> President<BR></SPAN><SPAN style="FONT-SIZE: 8pt">5885 Landerbrook Drive Suite 130, Cleveland Ohio, 44124</SPAN></FONT><FONT size=2><SPAN style="FONT-SIZE: 10pt"> <BR></SPAN></FONT><FONT size=1><SPAN style="FONT-SIZE: 8pt">Phone: 440.684.3101 x102 </SPAN><SPAN style="FONT-SIZE: 9pt"><B>|</B></SPAN><SPAN
style="FONT-SIZE: 8pt"> Fax: 440.684.3102<BR><FONT color=#0000ff><A rel=nofollow>mark.atwood@paragon-inc.com</A></FONT><FONT color=#1351f3> <<A href="http://us.mc11.mail.yahoo.com/mc/compose?to=mark.atwood@paragon-inc.com" rel=nofollow target=_blank ymailto="mailto:mark.atwood@paragon-inc.com">mailto:mark.atwood@paragon-inc.com</A>> </FONT></SPAN><SPAN style="FONT-SIZE: 9pt"><B>|</B></SPAN><SPAN style="FONT-SIZE: 8pt"> <FONT color=#0000ff>www.paragon-inc.com</FONT><FONT color=#1351f3> <<A href="http://www.paragon-inc.com/" rel=nofollow target=_blank>http://www.paragon-inc.com/</A>> <BR></FONT></SPAN></FONT></FONT><FONT color=#1f497d><FONT face="Calibri, Verdana, Helvetica, Arial"><SPAN style="FONT-SIZE: 11pt"><BR></SPAN></FONT></FONT><FONT face="Calibri, Verdana, Helvetica, Arial"><SPAN style="FONT-SIZE: 11pt"><BR></SPAN></FONT><FONT size=2><FONT face="Tahoma, Verdana, Helvetica, Arial"><SPAN style="FONT-SIZE:
10pt"><B>From:</B> <A rel=nofollow>nsrca-discussion-bounces@lists.nsrca.org</A> [<A href="http://us.mc11.mail.yahoo.com/mc/compose?to=nsrca-discussion-bounces@lists.nsrca.org" rel=nofollow target=_blank ymailto="mailto:nsrca-discussion-bounces@lists.nsrca.org">mailto:nsrca-discussion-bounces@lists.nsrca.org</A>] <B>On Behalf Of </B>Tim Taylor<BR><B>Sent:</B> Thursday, August 19, 2010 3:13 PM<BR><B>To:</B> <A rel=nofollow>nsrca-discussion@lists.nsrca.org</A><BR><B>Subject:</B> [NSRCA-discussion] Question.<BR></SPAN></FONT></FONT><FONT face="Times New Roman"><SPAN style="FONT-SIZE: 12pt"><BR></SPAN></FONT><FONT face="Calibri, Verdana, Helvetica, Arial"><SPAN style="FONT-SIZE: 11pt"><BR> </SPAN></FONT><FONT size=2><FONT face="Times New Roman"><SPAN style="FONT-SIZE: 10pt"><B>4. Model Aircraft Requirements: </B></SPAN></FONT></FONT><FONT face="Calibri, Verdana, Helvetica, Arial"><SPAN style="FONT-SIZE:
11pt"><BR> </SPAN></FONT><FONT size=2><FONT face="Times New Roman"><SPAN style="FONT-SIZE: 10pt"><B>4.1: Propulsion source limitations: </B>Electrically-powered model aircraft are limited to a maximum of 42.56 volts for the propulsion circuit, measured prior to flight while the competitor is in the ready box. </SPAN></FONT></FONT><FONT face="Calibri, Verdana, Helvetica, Arial"><SPAN style="FONT-SIZE: 11pt"><BR> </SPAN></FONT><FONT face="Times New Roman"><SPAN style="FONT-SIZE: 12pt"> </SPAN></FONT><FONT face="Calibri, Verdana, Helvetica, Arial"><SPAN style="FONT-SIZE: 11pt"><BR> </SPAN></FONT><FONT size=2><FONT face="Times New Roman"><SPAN style="FONT-SIZE: 10pt">I see Electrics have a "Displacement" limit, why are they limited and the IC engines not?</SPAN></FONT></FONT><FONT face="Calibri, Verdana, Helvetica, Arial"><SPAN style="FONT-SIZE: 11pt"> <BR> </SPAN></FONT><FONT face="Times New Roman"><SPAN
style="FONT-SIZE: 12pt"> </SPAN></FONT><FONT face="Calibri, Verdana, Helvetica, Arial"><SPAN style="FONT-SIZE: 11pt"><BR> </SPAN></FONT><FONT size=2><FONT face="Times New Roman"><SPAN style="FONT-SIZE: 10pt">I also see they must be checked in the ready box prior to each flight, anyone ever have this check done? Even at the worlds?</SPAN></FONT></FONT><FONT face="Calibri, Verdana, Helvetica, Arial"><SPAN style="FONT-SIZE: 11pt"> <BR> </SPAN></FONT><FONT face="Times New Roman"><SPAN style="FONT-SIZE: 12pt"> </SPAN></FONT><FONT face="Calibri, Verdana, Helvetica, Arial"><SPAN style="FONT-SIZE: 11pt"><BR> </SPAN></FONT><FONT size=2><FONT face="Times New Roman"><SPAN style="FONT-SIZE: 10pt">Or is this another ignored rule?</SPAN></FONT></FONT><FONT face="Calibri, Verdana, Helvetica, Arial"><SPAN style="FONT-SIZE: 11pt"> <BR> </SPAN></FONT><FONT face="Times New Roman"><SPAN style="FONT-SIZE: 12pt">
</SPAN></FONT><FONT face="Calibri, Verdana, Helvetica, Arial"><SPAN style="FONT-SIZE: 11pt"><BR> </SPAN></FONT><FONT size=2><FONT face="Times New Roman"><SPAN style="FONT-SIZE: 10pt">Tim</SPAN></FONT></FONT><FONT face="Calibri, Verdana, Helvetica, Arial"><SPAN style="FONT-SIZE: 11pt"> <BR> <BR></SPAN><FONT size=2><SPAN style="FONT-SIZE: 10pt"><BR></SPAN></FONT><SPAN style="FONT-SIZE: 11pt"><BR>
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