[NSRCA-discussion] Main battery redundant lead for receiver

Wed Jan 25 16:15:34 AKST 2012

You can make weight very easy in an Option!!!!  I used to have all the weights written down....somewhere!  

R

Sent from my Verizon Wireless Phone

----- Reply message -----
From: "J N Hiller" <jnhiller at earthlink.net>
To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org>
Subject: [NSRCA-discussion] Main battery redundant lead for receiver
Date: Wed, Jan 25, 2012 3:49 pm
Hi Mike.

If I could
get rid of my greasy stuff I think I'd go all electric but after reading of the
extraordinary measures taken to save a few grams it kind of depends what I can
get an E-Option to weigh. My #2 160 is 10 lb so I could probably do it. I need
to lookup component weights and get an estimated allowable airframe weight to compare.
Maybe next winter; I'll fly what I've got another season and work on improving
piloting skill, if that’s possible any more. I've never been a switch flipper
but I'm thinking I need to start. 

Jim         

-----Original
Message-----

From:
nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of astropuppy

Sent: Wednesday, January 25, 2012
12:47 PM

To: General pattern discussion

Subject: Re: [NSRCA-discussion]
Main battery redundant lead for receiver

You know you
want to go E Jim. As they say in Oregon: "Just do it".

Mike

On Wed, Jan
25, 2012 at 9:47 AM, J N Hiller <jnhiller at earthlink.net>
wrote:

Having judged these sequences I
absolutely agree that they have become more demanding. Do you think you could
fly the current schedules with 2006 battery technology?

Not in a
hurry to go E-Power but interested.

Jim

-----Original
Message-----

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Del

Sent: Wednesday, January 25, 2012
6:55 AM

To: General pattern discussion

Subject: Re: [NSRCA-discussion]
Main battery redundant lead for receiver

Dave.. Love how you win your discussions.. lol .. ;+}  

Del

----- Original Message
----- 

From:

Dave Lockhart 

To: 'General pattern discussion' 

Sent: Tuesday, January 24, 2012 7:07 PM

Subject: Re: [NSRCA-discussion] Main battery redundant lead for receiver

2006

9411sa x2 for
ailerons

8417sa x1 for
elevator

8411sa x1 for rudder

2009

Changed to 3517 x2
for elevator (in the same plane)….no change in mah per flight

2010

Changed to 8611A on
rudder (in the same plane)….no change in mah per flight

Flight times are
about 45 seconds shorter now.

I still have the
Prestige I flew in 2006, so no change to control surface size or throw.

I’m pretty sure it
is the changes in maneuvers flown and higher average watts used by the motor in
the course of the flight.  J

Regards,

Dave

From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org]
On Behalf Of Peter Vogel

Sent: Tuesday, January 24, 2012
6:59 PM

To: General pattern discussion

Subject: Re: [NSRCA-discussion]
Main battery redundant lead for receiver

Digital servos *definitely* draw more
power than non-digitals, but they are much more precise and hold their position
better, it's worth the higher draw for pattern.

Peter+

On Tue, Jan 24, 2012 at 3:46 PM, Doug
Cronkhite <seefo at san.rr.com>
wrote:

I suspect the servos also draw more power
than they did years ago.

Doug 

Sent from my iPhone

On Jan 24, 2012, at 3:40 PM, "Dave Lockhart" <DaveL322 at comcast.net>
wrote:

When I first started
flying electric pattern…..mah per flight was noticeably lower than now, going
from 40-60 per flight to 60-80 per flight…..flying whatever was the current P/F
sequences.  I suspect the increase is due to higher average flight speeds
(much more watts at the motor now) and more demanding maneuvers (snaps and KE).

Regards,

Dave

From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org]
On Behalf Of Keith Hoard

Sent: Tuesday, January 24, 2012
11:02 AM

To: General pattern discussion

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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Director, Fixed Wing Flight Training

Santa Clara County Model Aircraft Skypark

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