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<DIV>----- Original Message ----- </DIV>
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<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=idsmail@sbcglobal.net href="mailto:idsmail@sbcglobal.net">John
Pavlick</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=ronlock@comcast.net
href="mailto:ronlock@comcast.net">ronlock@comcast.net</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Cc:</B> <A title=jpavlick@idseng.com
href="mailto:jpavlick@idseng.com">jpavlick@idseng.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, June 16, 2006 3:29 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Switch
/replacement/reliability</DIV>
<DIV><BR></DIV>
<DIV>Ron,</DIV>
<DIV> You can forward this to the list - I'm at work so I can't do
it myself. This is the system that I have: I'm using 2 heavy duty
switches and one 2/3A 4-cell NiMH pack with 2 leads. The cells have very
low internal resistance (7mOhm) and the 4-cell pack only weighs about 3 ox.
The one part that people overlook is the switch. THAT is probably the most
unreliable part AND it factors into the "resistance" parameter if it's used in
line (not true with a "fail-safe" type). Even a good switch adds some
resistance. By using 2 switches, you minimize the resistance AND you add
reliability. It adds a little weight, but not much. I plug the second
switch into an unused receiver "channel". Another advantage to this setup is
that it allows you to measure the battery pack voltage when your radio is on
OR with an ESV in the conventional way. The ultimate system in terms of
reliability is of course 2 packs + 2 switches, but a good compromise can be
reached by using a dual-lead 5-cell pack with the 2 switch setup. Usually when
a cell fails, it looks like a short. No voltage out, but the other cells can
conduct current through it. Your pack voltage drops to slightly less than
a good 4-cell pack (because you still have 4 "good" cells working) and you can
still land the plane. I check my batteries before and after each flight
and I top them off before each flight with a Sirius charger. I use 4-cell
packs on my current airplanes to save weight and because I have Futaba servos
in one of them, but 5-cells are better in most cases.</DIV>
<DIV> </DIV>
<DIV>John Pavlick</DIV>
<DIV><A
href="http://www.idseng.com/">http://www.idseng.com</A><BR><BR><B><I>Ron
Lockhart <ronlock@comcast.net></I></B> wrote:</DIV>
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<DIV><FONT face=Arial size=2>Here is another candidate for switch
reliability.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>One battery with two leads each to a switch,
each lead from switch to RX.</FONT></DIV>
<DIV><FONT face=Arial size=2>If you can remember to turn on two switches (or
mechanically tie both switches to a single</FONT></DIV>
<DIV><FONT face=Arial size=2>mechanical actuator) you get redundant switches
and connectors to RX.</FONT></DIV>
<DIV><FONT face=Arial size=2>Zero additional single point failure
items, not heavy or expensive. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>If you want to add battery redundancy; Two
batts, each to it's own switch, each with</FONT></DIV>
<DIV><FONT face=Arial size=2>seperate cable and connector to
RX.</FONT></DIV>
<DIV><FONT face=Arial size=2>You have to accept additional workload of
checking both batteries often.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Later, Ron Lockhart</FONT></DIV>
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