[NSRCA-discussion] Main battery redundant lead for receiver

Tue Jan 24 08:01:52 AKST 2012

Not really, that's just what my public relations guy makes me say . . .

Keith Hoard
Collierville, TN
khoard at gmail.com

On Tue, Jan 24, 2012 at 11:00 AM, Ronald Van Putte <vanputte at cox.net> wrote:

> There's a Good Keith?  :-)
>
> Ron
>
> On Jan 24, 2012, at 10:54 AM, Keith Hoard wrote:
>
> Scott,
>
>    I depends on which Keith you ask. . . Good Keith, or Bad Keith. . . .
>
>
> Keith Hoard
> Collierville, TN
> khoard at gmail.com
>
>
>
>
> On Tue, Jan 24, 2012 at 10:51 AM, Scott McHarg <scmcharg at gmail.com> wrote:
>
>> Wayne,
>>   I redundant lipo (350mah) and a regulator will weigh in the
>> neighborhood of 50-60g which is exactly why some of us (excluding Keith
>> Hoard) are excited about Chris' new cable which eliminates the weight of
>> the extra battery.
>>
>> Scott
>>
>>
>> On Tue, Jan 24, 2012 at 11:48 AM, Wayne Galligan <wcgalligan at att.net>wrote:
>>
>>>   How much does a redundant LiPo and regulator weight?
>>> I guess I have been away from this stuff too long... these electrons are
>>> heavy things.
>>>
>>> Wayne Galligan
>>>
>>>  *From:* Anthony Romano <anthonyr105 at hotmail.com>
>>> *Sent:* Tuesday, January 24, 2012 10:38 AM
>>> *To:* nsrca-discussion at lists.nsrca.org
>>> *Subject:* Re: [NSRCA-discussion] Main battery redundant lead for
>>> receiver
>>>
>>>  Because an 1100mah A123 is 39g for the cell alone!
>>>
>>> Anthony
>>>
>>>  ------------------------------
>>> From: wcgalligan at att.net
>>> To: nsrca-discussion at lists.nsrca.org
>>> Date: Tue, 24 Jan 2012 11:30:08 -0600
>>>
>>> Subject: Re: [NSRCA-discussion] Main battery redundant lead for receiver
>>>
>>>  After all this discussion about extra wire connectors and regulators,
>>> etc., etc.   Interesting as it seems.
>>> Why not use an 1100 mil A123 pack for the receiver without the regulator.
>>> *  *I haven't weighed the difference but it couldn’t be that much.
>>> Sounds like your going for a lot extra work to save a few “Grams”.
>>>
>>> Simplicity rules.
>>>
>>> Wayne Galligan
>>>
>>>  *From:* Keith Hoard <khoard at gmail.com>
>>> *Sent:* Tuesday, January 24, 2012 10:01 AM
>>> *To:* General pattern discussion <nsrca-discussion at lists.nsrca.org>
>>> *Subject:* Re: [NSRCA-discussion] Main battery redundant lead for
>>> receiver
>>>
>>> Anthony,
>>>
>>>    On a typical flight, I'm guessing the radio only uses around
>>> 100-150Mah of power, while the motor is using 4000Mah, so that's about 4%
>>> more draw on those two cells.  In practice, I haven't been able to see any
>>> difference in the radio cells when I hook them up to my charger at the end
>>> of a flight.  Sometimes cells #1 & #2 are the high cells after a flight, so
>>> I think the power draw of the radio is negligible to our motor packs.
>>>
>>> The problem with two regulators plugged into the same 10S (or 5S) pack
>>> is that you are creating a dead short between the cells thru the ground
>>> wires (typically a straight wire thru the regulator).
>>>
>>> Say you plug Regulator #1 into cells #1&2, and Regulator #2 into cells
>>> #6&7.  The regulator's *ground *wires now have 5 cells of voltage
>>> potential (5 X 4.2V = 21Volts) between them since they are plugged into
>>> cells # 1 and #6.  When those two ground wires are then plugged into your
>>> receiver either thru a switch or direct connection the magic smoke will
>>> escape and your retailer will rejoice.
>>>
>>> Also, if you have both of your regulators plugged into your motor pack
>>> and the packs eject like Goose in Top Gun, you've lost both of your
>>> redundant power sources.  However, if you use a tiny 2S LiPo that is
>>> physically separated and secured inside your plane, you have both
>>> electrical and physical redundancy.
>>>
>>> Hmmm, just thought of something . . . maybe we should tie down the
>>> receiver so the main regulator can't take the receiver out with it. . . so
>>> many contingencies, so little weight . . .
>>>
>>> Keith Hoard
>>> Collierville, TN
>>> khoard at gmail.com
>>>
>>>
>>>
>>>
>>> On Tue, Jan 24, 2012 at 8:15 AM, Anthony Romano <anthonyr105 at hotmail.com
>>> > wrote:
>>>
>>>  Seems like a great idea but I have two questions. Do the packs come
>>> down out of balance since two cells are serving extra load? Is there a
>>> problem with parallel operation of two regulators?
>>>
>>> Thanks,
>>>
>>> Anthony
>>>
>>>  ------------------------------
>>> From: joddino at socal.rr.com
>>> Date: Mon, 23 Jan 2012 15:25:00 -0800
>>> To: nsrca-discussion at lists.nsrca.org
>>> Subject: Re: [NSRCA-discussion] Main battery redundant lead for receiver
>>>
>>> I've been using this setup for sometime and it is working great.  I have
>>> my two cell LiPo charged to 7.5 volts and it is connected to a 6.0 volt
>>> regulator into the receiver.  The cable connected to the balance connector
>>> on the "bottom" 5S is connected to a 6.3 volt regulator so it supplies all
>>> the current to the system and the 2S pack never needs charging.  I'm using
>>> an 800 mAh pack but it could be even smaller.
>>>
>>> Jim O
>>>
>>>
>>>  On Jan 23, 2012, at 2:09 PM, Scott McHarg wrote:
>>>
>>> Guys,
>>>    Chris Moon just e-mailed me about some leads that were done at the
>>> factory.  These leads run off your balance leads to a voltage regulator and
>>> allow your main battery pack to be utilized as a redundant receiver
>>> battery.  It is NOT meant to be a primary but it will save 20+ grams if
>>> you're running 2 rx batteries.  You still have to run the 2nd regulator for
>>> true redundancy but you eliminate the 2nd battery.  These leads are factory
>>> made and eliminate the need to make them yourself with the concern about
>>> plugging in to the wrong cell.  I know in my article, I was pretty much
>>> against doing this as a backup but, with Chris having this made at the
>>> factory, he has all but eliminated making a mistake by tying to the wrong
>>> cell.  I have the link that I'll e-mail you off-list or you can just go to
>>> his website.  I don't want to break the NSRCA list rules by advertising for
>>> him even though he advertises with the NSRCA.  The leads are only $3.99
>>> each and are found under the Connectors/Adapters listing.
>>>
>>> Thank,
>>> Scott
>>>
>>> --
>>> *Scott A. McHarg*
>>>
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>>
>>
>>
>> --
>> *Scott A. McHarg*
>>
>>
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