[NSRCA-discussion] Main battery redundant lead for receiver

Mon Jan 23 14:18:32 AKST 2012

Peter,

HV servos on unregulated 2S lipo is akin to std servos on unregulated 4s/5s
Nixx.

Using a regulator is a separate issue...the real purpose of the regulator is
to provide constant voltage to the servos regardless of the operational
voltage range.

Regards,

Dave

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Peter Vogel
Sent: Monday, January 23, 2012 5:56 PM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] Main battery redundant lead for receiver

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> 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> 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> 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> 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> 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

_______________________________________________
NSRCA-discussion mailing list
NSRCA-discussion at lists.nsrca.org
http://lists.nsrca.org/mailman/listinfo/nsrca-discussion

_______________________________________________
NSRCA-discussion mailing list
NSRCA-discussion at lists.nsrca.org
http://lists.nsrca.org/mailman/listinfo/nsrca-discussion

-- 
Scott A. McHarg

_______________________________________________
NSRCA-discussion mailing list
NSRCA-discussion at lists.nsrca.org
http://lists.nsrca.org/mailman/listinfo/nsrca-discussion

-- 

Director, Fixed Wing Flight Training

Santa Clara County Model Aircraft Skypark

_______________________________________________
NSRCA-discussion mailing list
NSRCA-discussion at lists.nsrca.org
http://lists.nsrca.org/mailman/listinfo/nsrca-discussion

_______________________________________________
NSRCA-discussion mailing list
NSRCA-discussion at lists.nsrca.org
http://lists.nsrca.org/mailman/listinfo/nsrca-discussion

-- 

Director, Fixed Wing Flight Training

Santa Clara County Model Aircraft Skypark

  <http://farm8.staticflickr.com/7163/6513778381_5569cc985d_m.jpg> 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.nsrca.org/pipermail/nsrca-discussion/attachments/20120123/cb8bcb81/attachment.html>