[NSRCA-discussion] Main battery redundant lead for receiver
John Gayer
jgghome at comcast.net
Mon Jan 23 15:33:11 AKST 2012
http://www.f3aunlimited.com/webstore/index.php?main_page=index&cPath=40
Use the ones with a failsafe switch. The Tech-aero regulators have an
adjustable output. The Jaccio ones available here do not appear to be
adjustable. It is nice to set the 2s lipo enough lower than the main
regulator that there is no drain on the backup. Jim's suggestion of 6.3
and 6.0 volts is a good one. Then all you have to do is check the
reserve charge before each flying session.
BTW, Keith Hoard and I have been flying this system since last spring
without any issues using Tech-Aero regulators.
John
On 1/23/2012 5:08 PM, Peter Vogel wrote:
> I love this list, you learn something new everyday... My thinking
> here was that since my RX has two battery leads, one goes to a
> straight up 2S lipo, the other goes to the main 2S tap, the voltage
> from the main should always be lower than the primary RX battery so
> the RX will always use the primary unless something bad happens at
> which point any power, even some rippling power will be sufficient to
> bring the bird home safe.
>
> But, if that theory is wrong, what reg are folks using to get HV
> (7.4v) power?
>
> Peter+
>
> On Mon, Jan 23, 2012 at 3:34 PM, Keith Hoard <khoard at gmail.com
> <mailto:khoard at gmail.com>> wrote:
>
> Peter,
>
> You will still want to use a regulator since the ESC is causing
> the voltage to fluctuate (Castle calls it "Voltage Ripple") while
> running. The regulator chops off the voltage below where the volts
> are rippling. . .
> .
> And that's your technical 'esplanation of the day.
>
> Keith Hoard
> Collierville, TN
>
> On Jan 23, 2012, at 16:56, Peter Vogel <vogel.peter at gmail.com
> <mailto:vogel.peter at gmail.com>> wrote:
>
>> Ah. Now that's a good idea + point. And then, in my case, where
>> I'm running HV, I don't even need a reg. That would provide true
>> power redundancy for almost no weight penalty, though it does run
>> the risk of yanking your RX out if your main battery ejects, or,
>> even if it doesn't yank the Rx (which is held in by 6 servo leads
>> after all, it could yank the redundant battery lead loose and the
>> main system battery is of course yanking itself, so you are left
>> with no radio...
>>
>> Scott, how do you come up with 20g savings? What size Rx battery
>> are you running? My TP 1350's weigh 76g, even 900's are in the
>> 60+g range.
>>
>> Peter+
>>
>> On Mon, Jan 23, 2012 at 2:51 PM, Keith Hoard <khoard at gmail.com
>> <mailto:khoard at gmail.com>> wrote:
>>
>> Only tap off two cells of your main pack. You can then use a
>> regular regulator (as opposed to a non-regular regulator).
>>
>> Keith Hoard
>> Collierville, TN
>>
>> On Jan 23, 2012, at 16:49, Peter Vogel <vogel.peter at gmail.com
>> <mailto:vogel.peter at gmail.com>> wrote:
>>
>>> And, of course, with a non-switching BEC off a 10s or even a
>>> 5s pack you would have massive heat issues as it tries to
>>> step down the voltage from 18.5 volts to 7.2 or 6 volts,
>>> depending on whether you are running an HV or standard
>>> voltage setup, so the regulator would probably need a fan or
>>> heat sink of some sort, which likely negates any weight
>>> savings from not running with a second battery.
>>>
>>> Peter+
>>>
>>> On Mon, Jan 23, 2012 at 2:30 PM, Scott McHarg
>>> <scmcharg at gmail.com <mailto:scmcharg at gmail.com>> wrote:
>>>
>>> You have to be careful using the BEC, especially from CC
>>> because it is a switching regulator which cannot be run
>>> in parallel. It's really best not to use the BEC and
>>> set up a truly separate system.
>>>
>>> Scott
>>>
>>>
>>> On Mon, Jan 23, 2012 at 4:28 PM, George Kennie
>>> <geobet4evr at gmail.com <mailto:geobet4evr at gmail.com>> wrote:
>>>
>>> Could a CC BEC also be used instead of a reg.? I
>>> don't know how much curent is passed by a reg.
>>> Sounds good cause it's a bummer trying to solder an
>>> extra lead to the Deans.
>>> G.
>>>
>>> On Mon, Jan 23, 2012 at 5:09 PM, Scott McHarg
>>> <scmcharg at gmail.com <mailto:scmcharg at gmail.com>> 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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>>>
>>> --
>>> Director, Fixed Wing Flight Training
>>> Santa Clara County Model Aircraft Skypark
>>>
>>>
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>> --
>> Director, Fixed Wing Flight Training
>> Santa Clara County Model Aircraft Skypark
>>
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