[NSRCA-discussion] Question.

[Randall Bearden]

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.

On 8/19/10 3:22 PM, "Atwood, Mark" <atwoodm at paragon-inc.com> wrote:

> I can¹t answer the ³checking² question, as I have never had mine checked, but
> I ³think² I was told they did at the worlds.  As to why the limit on voltage,
> that¹s 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.
>  
> There has been talk about raising that limit to accommodate 12s batteries
> which FAI has done for the Heli F3C competitions.  I doubt you¹ll see it go
> above that.   I¹m actually surprised that the AMA hasn¹t put an upper limit
> (or maybe they have and I¹m unaware) for the same safety reason.
>  
> I can only imagine what a good old fashioned electrocution would do for our
> image.   Big bird fun fryŠ
>  
>  
>  
> Mark Atwood
> Paragon Consulting, Inc.  |  President
> 5885 Landerbrook Drive Suite 130, Cleveland Ohio, 44124
> Phone: 440.684.3101 x102  |  Fax: 440.684.3102
> mark.atwood at paragon-inc.com <mailto:mark.atwood at paragon-inc.com>   |
> www.paragon-inc.com <http://www.paragon-inc.com/>
>  
> 
> From: nsrca-discussion-bounces at lists.nsrca.org
> [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Tim Taylor
> Sent: Thursday, August 19, 2010 3:13 PM
> To: nsrca-discussion at lists.nsrca.org
> Subject: [NSRCA-discussion] Question.
>  
>  
>    4. Model Aircraft Requirements:
>   4.1: Propulsion source limitations: 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.
>     
>   I see Electrics have a "Displacement" limit, why are they limited and the IC
> engines not? 
>     
>   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?
>     
>   Or is this another ignored rule?
>     
>   Tim 
>   
>  
> 
> 
> _______________________________________________
> NSRCA-discussion mailing list
> NSRCA-discussion at lists.nsrca.org
> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.nsrca.org/pipermail/nsrca-discussion/attachments/20100820/61df89ad/attachment.html>