[NSRCA-discussion] Max volts

[Jay Marshall]

Not even a switcher is 100% efficient!

 

Jay Marshall 

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of John Pavlick
Sent: Monday, March 01, 2010 10:51 AM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] Max volts

 


Not if it was a switching regulator. 

 

John Pavlick

--- On Mon, 3/1/10, Jay Marshall <lightfoot at sc.rr.com> wrote:


From: Jay Marshall <lightfoot at sc.rr.com>
Subject: Re: [NSRCA-discussion] Max volts
To: "'General pattern discussion'" <nsrca-discussion at lists.nsrca.org>
Date: Monday, March 1, 2010, 10:33 AM

The motor current x voltage drop in the regulator = wasted heat

Jay Marshall

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
<http://us.mc805.mail.yahoo.com/mc/compose?to=nsrca-discussion-bounces@lists
.nsrca.org> 
[mailto:nsrca-discussion-bounces at lists.nsrca.org
<http://us.mc805.mail.yahoo.com/mc/compose?to=nsrca-discussion-bounces@lists
.nsrca.org> ] On Behalf Of Ron Van Putte
Sent: Monday, March 01, 2010 10:30 AM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] Max volts

Never thought of that, but wouldn't the energy to regulate down the  
42.56 volts just be dumped as heat?

Ron

On Mar 1, 2010, at 8:54 AM, krishlan fitzsimmons wrote:

> 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
<http://us.mc805.mail.yahoo.com/mc/compose?to=chad@f3acanada.org> >
> To: nsrca-discussion at lists.nsrca.org
<http://us.mc805.mail.yahoo.com/mc/compose?to=nsrca-discussion@lists.nsrca.o
rg> 
> 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
<http://us.mc805.mail.yahoo.com/mc/compose?to=nsrca-discussion-bounces@lists
.nsrca.org> 
> >>> [mailto:nsrca-discussion-bounces at lists.nsrca.org
<http://us.mc805.mail.yahoo.com/mc/compose?to=nsrca-discussion-bounces@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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