[NSRCA-discussion] Max volts

Mon Mar 1 15:34:22 AKST 2010

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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>>>>>>
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