[NSRCA-discussion] Max volts

Mon Mar 1 16:42:10 AKST 2010

And about 6 more things to break or go awry in the middle of a 
flight.  So long, KISS!!

At 07:34 PM 3/1/2010, you wrote:
>That's a good idea.  I imagine it would take a little modification 
>to the rule to specify how a system like this could be 
>applied.  This could be put together external to the speed 
>controller and function automatically through active voltage 
>sensing.  Eventually the ESC mfgs could go a step further an just 
>integrate this right into the controller.  Slick, simple concept Jim!
>
>Ed
>
>--------------------------------------------------
>From: "James Oddino" <joddino at socal.rr.com>
>Sent: Monday, March 01, 2010 7:15 PM
>To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org>
>Subject: Re: [NSRCA-discussion] Max volts
>
>>I have the functional concept that solves the rules 
>>problem.  Picture a 10S pack positive lead wired to the common of a 
>>switch with two poles, a piece of wire connected from one pole to a 
>>pole on a second two pole switch with its common connected to the 
>>ESC.  Between the other two poles we place our 11th cell.  When the 
>>10S pack is above 37.5 volts the 11th cell is bypassed and when it 
>>is below, like it will be during vertical maneuvers late in flight, 
>>the 11th cell is put in series to boost the voltage to up to 41.7 
>>volts.  At no time is the voltage over the spec.
>>
>>Having said that, I believe the 10S system provides adequate power 
>>with the right motor at all times of flight even if the voltage 
>>drops to 35 volts.
>>
>>Jim
>>
>>
>>On Mar 1, 2010, at 8:59 AM, Bob Kane wrote:
>>
>>>Going higher and regulating down would be against the rules, the 
>>>max volts is still limited to 42.56.
>>>
>>>Bob Kane
>>>getterflash at yahoo.com
>>>
>>>
>>>--- On Mon, 3/1/10, krishlan fitzsimmons 
>>><homeremodeling2003 at yahoo.com> wrote:
>>>
>>>>From: krishlan fitzsimmons <homeremodeling2003 at yahoo.com>
>>>>Subject: Re: [NSRCA-discussion] Max volts
>>>>To: chad at f3acanada.org, "General pattern discussion" 
>>>><nsrca-discussion at lists.nsrca.org>
>>>>Date: Monday, March 1, 2010, 9:54 AM
>>>>
>>>>Couldn't we go to a higher voltage and
>>>>regulate it back down? A contstant 42.56v would be nice!
>>>>
>>>>Chris
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>From: Chad
>>>>Northeast <chad at f3acanada.org>
>>>>To:
>>>>nsrca-discussion at lists.nsrca.org
>>>>Sent: Sun,
>>>>February 28, 2010 8:48:48 PM
>>>>Subject: Re:
>>>>[NSRCA-discussion] Max volts
>>>>
>>>>You would be at about 50% capacity at 3.85 ish volts/cell
>>>>(resting open circuit), so unless you up the capacity you
>>>>will have a pretty restricted flight time.
>>>>
>>>>Chad
>>>>
>>>>On 10-02-28 9:25 PM, Ron Van Putte wrote:
>>>>>That stirs a wild thought in my brain.  Fully
>>>>charged packs don't stay at 4.2 volts per cell very
>>>>long.  On the other hand, once the initial charge
>>>>voltage is burned off by a constant load, the voltage loss
>>>>curve "flattens out".  What if you put fully
>>>>charged 6S and a 5S packs in series and "burn them
>>>>down" to 3.869 volts per cell (a total of 42.56
>>>>volts for an 11-cell pack) so they were legal for
>>>>use.  Would the voltage of this depleted 11S pack be
>>>>higher than a fully charged 10S pack at the end of a typical
>>>>flight?  If the end-of-flight voltage might be
>>>>significantly higher for the 11S pack vice a 10S pack, it
>>>>would be worth investigating, even considering the extra
>>>>weight of the additional cell.  Come on you electronic
>>>>gurus, show me where I'm wrong.
>>>>>
>>>>>Ron Van Putte
>>>>>
>>>>>On Feb 28, 2010, at 10:00 PM, James Oddino wrote:
>>>>>
>>>>>>What comes after ...?  Does it specify a load
>>>>or any other conditions?  Is it measured during the
>>>>noise test and have a minimum value?
>>>>>>
>>>>>>Just stirring the pot, Jim O
>>>>>>
>>>>>>
>>>>>>On Feb 28, 2010, at 5:21 PM, John Fuqua wrote:
>>>>>>
>>>>>>>No its not (assuming we are talking RC
>>>>Aerobatics).  Try page RCA-2 para 4.1
>>>>>>>which
>>>>states "Electrically-powered model aircraft are
>>>>limited to a maximum
>>>>>>>of 42.56 volts.."
>>>>>>>
>>>>>>>-----Original Message-----
>>>>>>>From: nsrca-discussion-bounces at lists.nsrca.org
>>>>>>>[mailto:nsrca-discussion-bounces at lists.nsrca.org]
>>>>On Behalf Of Ron Van Putte
>>>>>>>Sent: Sunday, February 28, 2010 7:07 PM
>>>>>>>To: General pattern discussion
>>>>>>>Subject: Re: [NSRCA-discussion] Max volts
>>>>>>>
>>>>>>>It's in the general rules, not in the R/C
>>>>section.
>>>>>>>
>>>>>>>
>>>>>>>On Feb 28, 2010, at 6:50 PM, Jim Quinn wrote:
>>>>>>>
>>>>>>>>Where can I find the rule
>>>>for max volts?
>>>>>>>>
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-->There are only two types of aircraft -- fighters and targets.

Phil Spelt, Past President, Knox County Radio Control Society, Inc.
        URL: http://www.kcrctn.com
AMA--1294,  Scientific Leader Member, SPA--177
       My URL: http://mywebpages.comcast.net/~chuenkan/
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