[NSRCA-discussion] Switch /replacement/reliability

Fri Jun 16 10:53:22 AKDT 2006

This is what I have been thinking lately.... and  with the redundancy of
a 5C nicad or nimh, it would all but take care of most battery concerns
shy of an internal short.  Of course if you went with 600 or 800ma
batteries the wt/cost wouldn't be much of a penalty....

Chris

________________________________

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Bob
Richards
Sent: Friday, June 16, 2006 1:38 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Switch /replacement/reliability

Like checking both mags before taking off in a real plane!!!

Bob R.

Ron Lockhart <ronlock at comcast.net> wrote:

	Here is another candidate for switch reliability.

	One battery with two leads each to a switch, each lead from
switch to RX.

	If you can remember to turn on two switches (or mechanically tie
both switches to a single

	mechanical actuator) you get redundant switches and connectors
to RX.

	Zero additional single point failure items, not heavy or
expensive. 

	If you want to add battery redundancy; Two batts, each to it's
own switch, each with

	seperate cable and connector to RX.

	You have to accept additional workload of checking both
batteries often.

	Later, Ron Lockhart

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

		From: Wayne Galligan <mailto:wgalligan at goodsonacura.com>

		To: NSRCA Mailing List
<mailto:nsrca-discussion at lists.nsrca.org>  

		Sent: Friday, June 16, 2006 8:56 AM

		Subject: Re: [NSRCA-discussion]
Voltageregulatormaintenance/replacement/reliability

		Chris,

		I have been using the MPI Miracle switch now for 5 yrs
and 6 different planes with no failures of the electronics.  I have had
two of them where the case has broken or the tab where the screw holds
it has broken.  Maybe I tightened them too much.   I have concidered
just using a H.D. Futaba switch and not using a regulator just to keep
one more point of failure out of the equation.

		Wayne Galligan

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

			From: White, Chris <mailto:chris at ssd.fsi.com>  

			To: NSRCA Mailing List
<mailto:nsrca-discussion at lists.nsrca.org>  

			Sent: Friday, June 16, 2006 7:25 AM

			Subject: [NSRCA-discussion] Voltage
regulatormaintenance/replacement/reliability

			I know when a regulator fails when using a li-on
battery the results are catastrophic.   (lost one that way with a
miracle switch)  How often should a voltage regulator be replaced?  Is
one VR better than another?  Are there any checks which can be done to
curtail disaster.

			At this point I prefer flying 5C non-regulated
nimh or nicads....just to take the VR out of the loop.   I still have an
airplane which has Li-on's and am thinking hard about how far I should
push the regulator.   Airplane is probably 5-6 years old and equipment
is probably original radio stuff.  I have 153 flights on it myself and
don't know how many the previous owners put on it.  (The onboard Li-on
is 2004 with the 153 flights....should it be replaced?)

			Your input is appreciated!

			Chris

________________________________

			From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of John
Ferrell
			Sent: Thursday, June 15, 2006 4:48 PM
			To: NSRCA Mailing List
			Subject: Re: [NSRCA-discussion] JR and
un-regulated 6V

			Three-terminal regulators dissipate the unused
part of the power.

			My Prophecy takes about 135 mils per flight to
recharge. There are a lot of factors that affect this number, especially
airframe vibration.

			I keep an eye on it and am more worried about it
being consistent rather than some value. 

			John Ferrell    W8CCW
			"My Competition is not my enemy"
			http://DixieNC.US <http://dixienc.us/> 

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

				From: Wayne Galligan
<mailto:wgalligan at goodsonacura.com>  

				To: NSRCA Mailing List
<mailto:nsrca-discussion at lists.nsrca.org>  

				Sent: Thursday, June 15, 2006 10:21 AM

				Subject: Re: [NSRCA-discussion] JR and
un-regulated 6V

				Does running a regulator, like a
5.1v-5.5v or 6.0v regulator, have any signifigant draw on the battery as
it regulates the voltage?  I have been using the MPI Miracle switch that
regulates to 6v.  I can get (4) 15 min flights on a 1650mil NiMh
pack(Sanyo) before my ESC says to stop flying.

				I will put back about 700-750 mil on the
recharge.

				Wayne Galligan 

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

				From: White, Chris
<mailto:chris at ssd.fsi.com>  

				To: NSRCA Mailing List
<mailto:nsrca-discussion at lists.nsrca.org>  

				Sent: Thursday, June 15, 2006 7:54 AM

				Subject: Re: [NSRCA-discussion] JR and
un-regulated 6V

				Hi Matt,

				Are you using low-impedence nimh packs?
Would you divulge your battery source?

				Thanks, Chris

________________________________

				From:
nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of
rcmaster199 at aol.com
				Sent: Wednesday, June 14, 2006 5:03 PM
				To: nsrca-discussion at lists.nsrca.org
				Subject: Re: [NSRCA-discussion] JR and
un-regulated 6V

				I am doing that with NO problems. Fast
charged on the way to field most of the time, with a Serius fast
charger. In my set-up, a 1650ma NiMH lasts about 3 flights longer than a
4 cell pack of equivalent capacity. Equivalent ending cell voltages of
1.20v unloaded (1.15V loaded with 1000 ma draw) for either battery. 

				Getting greater torque and speed as well
as longer flight time. Best all around

				MattK

				-----Original Message-----
				From: Gene Maurice
<gene.maurice at comcast.net>
				To: 'NSRCA Mailing List'
<nsrca-discussion at lists.nsrca.org>
				Sent: Wed, 14 Jun 2006 15:36:18 -0500
				Subject: [NSRCA-discussion] JR and
un-regulated 6V

				Anyone aware of any issues running
unregulated 6v Nimh pack with JR Digital

				servos??  

				Gene Maurice

				gene.maurice at comcast.net
<mailto:gene.maurice%40comcast.net> 

				Plano, TX

				AMA 3408, NSRCA 877

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