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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Essentially a governor for the peak power
only…with constant “re-mapping” of the throttle curve to keep
the power the same across the throttle range. SOME people have been
asking for this basic concept as an additional programming parameter for a LONG
time (I won’t admit to when I first asked for this). It would be
very nice to program max RPM (essentially a function of voltage available,
which reflects power available from the lipo) and set it for something close to
what is seen at the end of a flight on a cool day on a “middle of the
road” lipo (assuming it is performing well enough for competition
flights). THEN…all competition grade lipos would run essentially
identically for the duration of the flight. If more people asked for this
feature…the “squeaky” wheel might get greased sooner……..<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Dave<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Ed Alt<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, March 01, 2010 8:10
PM<br>
<b><span style='font-weight:bold'>To:</span></b>
nsrca-discussion@lists.nsrca.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [NSRCA-discussion]
Max volts</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 color=black face=Calibri><span
style='font-size:12.0pt;font-family:Calibri;color:black'>Along the lines of
taking advantage of better batteries, ESC's could compensate for packs as they
flatten out. Essentially, an ESC could be designed to automatically
de-rate the battery when it is above a prescribed level of charge. I
don't really keep up with what the various ESCs have feature-wise, but I
haven't heard of this being done yet. I don't think it would be hard
either. Effectively, it's like a built-in ATV that simply limits the pulse
width at full power when the battery is above a certain level, just as it
already does in response to throttle inputs. There's an advantage to this
in that the battery pack & wiring arrangement stays simple and that
all cells in the pack get used simultaneously. I still like Jim's
original idea, especially because it got some more thinking on the topic
going.</span></font><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'> <o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=3 color=black face=Calibri><span
style='font-size:12.0pt;font-family:Calibri;color:black'>Ed</span></font><font
size=2 color=black face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
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<div style='font-color:black'>
<p class=MsoNormal style='background:whitesmoke'><b><font size=2 color=black
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;color:black;
font-weight:bold'>From:</span></font></b><font size=2 color=black face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;color:black'> <a
href="mailto:AtwoodDon@aol.com" title="AtwoodDon@aol.com">AtwoodDon@aol.com</a>
<o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal style='background:whitesmoke'><b><font size=2 color=black
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;color:black;
font-weight:bold'>Sent:</span></font></b><font size=2 color=black face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;color:black'> Monday, March 01, 2010
8:01 PM<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='background:whitesmoke'><b><font size=2 color=black
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;color:black;
font-weight:bold'>To:</span></font></b><font size=2 color=black face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;color:black'> <a
href="mailto:nsrca-discussion@lists.nsrca.org"
title="nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='background:whitesmoke'><b><font size=2 color=black
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;color:black;
font-weight:bold'>Subject:</span></font></b><font size=2 color=black
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;color:black'> Re:
[NSRCA-discussion] Max volts<o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=2 color=black face=Arial id="role_document"><span
style='font-size:10.0pt;font-family:Arial;color:black'>This approach could also
function as a backup RX battery. No rules against having redundant RX
power. The BEC could be programmed to 'divert' power to the flight
batteries to maintain the near max voltage when needed.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'> <o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>However, I agree with Jim, I don't see
the need for this. <st1:place w:st="on">Battery</st1:place> technology
has/is progressing fast enough to provide us with enough power for our
sequences. I prefer the simpler approach.<o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'> <o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>Don<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'> <o:p></o:p></span></font></p>
</div>
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<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>In a message dated 3/1/2010 4:34:31 P.M.
Pacific Standard Time, ed_alt@hotmail.com writes:<o:p></o:p></span></font></p>
</div>
<blockquote style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:4.2pt;margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>That's a good idea. I imagine it
would take a little modification to the <br>
rule to specify how a system like this could be applied. This could be
put <br>
together external to the speed controller and function automatically through <br>
active voltage sensing. Eventually the ESC mfgs could go a step further
an <br>
just integrate this right into the controller. Slick, simple concept Jim!<br>
<br>
Ed<br>
<br>
--------------------------------------------------<br>
From: "James Oddino" <joddino@socal.rr.com><br>
Sent: Monday, March 01, 2010 7:15 PM<br>
To: "General pattern discussion" <nsrca-discussion@lists.nsrca.org><br>
Subject: Re: [NSRCA-discussion] Max volts<br>
<br>
> I have the functional concept that solves the rules problem. Picture
a <br>
> 10S pack positive lead wired to the common of a switch with two poles, a <br>
> piece of wire connected from one pole to a pole on a second two pole <br>
> switch with its common connected to the ESC. Between the other two
poles <br>
> we place our 11th cell. When the 10S pack is above 37.5 volts the
11th <br>
> cell is bypassed and when it is below, like it will be during vertical <br>
> maneuvers late in flight, the 11th cell is put in series to boost the <br>
> voltage to up to 41.7 volts. At no time is the voltage over the
spec.<br>
><br>
> Having said that, I believe the 10S system provides adequate power with <br>
> the right motor at all times of flight even if the voltage drops to 35 <br>
> volts.<br>
><br>
> Jim<br>
><br>
><br>
> On Mar 1, 2010, at 8:59 AM, Bob Kane wrote:<br>
><br>
>> Going higher and regulating down would be against the rules, the max <br>
>> volts is still limited to 42.56.<br>
>><br>
>> Bob Kane<br>
>> getterflash@yahoo.com<br>
>><br>
>><br>
>> --- On Mon, 3/1/10, krishlan fitzsimmons
<homeremodeling2003@yahoo.com> <br>
>> wrote:<br>
>><br>
>>> From: krishlan fitzsimmons <homeremodeling2003@yahoo.com><br>
>>> Subject: Re: [NSRCA-discussion] Max volts<br>
>>> To: chad@f3acanada.org, "General pattern discussion" <br>
>>> <nsrca-discussion@lists.nsrca.org><br>
>>> Date: Monday, March 1, 2010, 9:54 AM<br>
>>><br>
>>> Couldn't we go to a higher voltage and<br>
>>> regulate it back down? A contstant 42.56v would be nice!<br>
>>><br>
>>> Chris<br>
>>><br>
>>><br>
>>><br>
>>><br>
>>><br>
>>><br>
>>><br>
>>><br>
>>><br>
>>> From: Chad<br>
>>> Northeast <chad@f3acanada.org><br>
>>> To:<br>
>>> nsrca-discussion@lists.nsrca.org<br>
>>> Sent: Sun,<br>
>>> February 28, 2010 8:48:48 PM<br>
>>> Subject: Re:<br>
>>> [NSRCA-discussion] Max volts<br>
>>><br>
>>> You would be at about 50% capacity at 3.85 ish volts/cell<br>
>>> (resting open circuit), so unless you up the capacity you<br>
>>> will have a pretty restricted flight time.<br>
>>><br>
>>> <st1:country-region w:st="on"><st1:place w:st="on">Chad</st1:place></st1:country-region><br>
>>><br>
>>> On 10-02-28 9:25 PM, Ron Van Putte wrote:<br>
>>>> That stirs a wild thought in my brain. Fully<br>
>>> charged packs don't stay at 4.2 volts per cell very<br>
>>> long. On the other hand, once the initial charge<br>
>>> voltage is burned off by a constant load, the voltage loss<br>
>>> curve "flattens out". What if you put fully<br>
>>> charged 6S and a 5S packs in series and "burn them<br>
>>> down" to 3.869 volts per cell (a total of 42.56<br>
>>> volts for an 11-cell pack) so they were legal for<br>
>>> use. Would the voltage of this depleted 11S pack be<br>
>>> higher than a fully charged 10S pack at the end of a typical<br>
>>> flight? If the end-of-flight voltage might be<br>
>>> significantly higher for the 11S pack vice a 10S pack, it<br>
>>> would be worth investigating, even considering the extra<br>
>>> weight of the additional cell. Come on you electronic<br>
>>> gurus, show me where I'm wrong.<br>
>>>><br>
>>>> Ron Van Putte<br>
>>>><br>
>>>> On Feb 28, 2010, at 10:00 PM, James Oddino wrote:<br>
>>>><br>
>>>>> What comes after ...? Does it specify a load<br>
>>> or any other conditions? Is it measured during the<br>
>>> noise test and have a minimum value?<br>
>>>>><br>
>>>>> Just stirring the pot, Jim O<br>
>>>>><br>
>>>>><br>
>>>>> On Feb 28, 2010, at 5:21 PM, John Fuqua wrote:<br>
>>>>><br>
>>>>>> No its not (assuming we are talking RC<br>
>>> Aerobatics). Try page RCA-2 para 4.1<br>
>>>>>> which<br>
>>> states "Electrically-powered model aircraft are<br>
>>> limited to a maximum<br>
>>>>>> of 42.56 volts.."<br>
>>>>>><br>
>>>>>> -----Original Message-----<br>
>>>>>> From: nsrca-discussion-bounces@lists.nsrca.org<br>
>>>>>> [mailto:nsrca-discussion-bounces@lists.nsrca.org]<br>
>>> On Behalf Of Ron Van Putte<br>
>>>>>> Sent: Sunday, February 28, 2010 7:07 PM<br>
>>>>>> To: General pattern discussion<br>
>>>>>> Subject: Re: [NSRCA-discussion] Max volts<br>
>>>>>><br>
>>>>>> It's in the general rules, not in the R/C<br>
>>> section.<br>
>>>>>><br>
>>>>>><br>
>>>>>> On Feb 28, 2010, at 6:50 PM, Jim Quinn wrote:<br>
>>>>>><br>
>>>>>>> Where can I find the rule<br>
>>> for max volts?<br>
>>>>>>><br>
>>>>>>><br>
>>> _______________________________________________<br>
>>>>>>> NSRCA-discussion mailing list<br>
>>>>>>> NSRCA-discussion@lists.nsrca.org<br>
>>>>>>><br>
>>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion<br>
>>>>>><br>
>>>>>><br>
>>> _______________________________________________<br>
>>>>>> NSRCA-discussion mailing list<br>
>>>>>> NSRCA-discussion@lists.nsrca.org<br>
>>>>>>
http://lists.nsrca.org/mailman/listinfo/nsrca-discussion<br>
>>>>>><br>
>>>>>><br>
>>> _______________________________________________<br>
>>>>>> NSRCA-discussion mailing<br>
>>> list<br>
>>>>>> NSRCA-discussion@lists.nsrca.org<br>
>>>>>>
http://lists.nsrca.org/mailman/listinfo/nsrca-discussion<br>
>>>>><br>
>>>>> _______________________________________________<br>
>>>>> NSRCA-discussion mailing list<br>
>>>>> NSRCA-discussion@lists.nsrca.org<br>
>>>>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion<br>
>>>><br>
>>>> _______________________________________________<br>
>>>> NSRCA-discussion mailing list<br>
>>>> NSRCA-discussion@lists.nsrca.org<br>
>>>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion<br>
>>>><br>
>>> _______________________________________________<br>
>>> NSRCA-discussion mailing list<br>
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>>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion<br>
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>>><br>
>>><br>
>>><br>
>>> -----Inline Attachment Follows-----<br>
>>><br>
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>><br>
>><br>
>><br>
>> _______________________________________________<br>
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><br>
> _______________________________________________<br>
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> NSRCA-discussion@lists.nsrca.org<br>
> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion<br>
> <br>
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