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<DIV><FONT face=Arial size=2>I could be wrong, but I think they may have been
using germanium diodes back then to get the lowest possible junction
drop. You've got to weigh the benefit of messing with all those
solder joints, heating the cells etc against maybe just going with a redundant
pack. Plus you have to be pretty careful about routing the diode leads and
bodies to avoid shorts and possibly having the thing wear against the insulating
wrap on the cells. You can get the weights right with smaller packs etc.
and just do two to get your reliability up.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Ed</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV>----- Original Message ----- </DIV>
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<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=bob@toprudder.com href="mailto:bob@toprudder.com">Bob Richards</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, February 24, 2006 1:42
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] NiMH
Question</DIV>
<DIV><BR></DIV>
<DIV>The diodes they used back then probably would not work as well in a
modern system, since we have much more of a current drain with today's
servos.</DIV>
<DIV> </DIV>
<DIV>I would suspect any good rectifier rated for the expected current would
work.</DIV>
<DIV> </DIV>
<DIV>Bob R.</DIV>
<DIV><BR><BR><B><I>Wayne Galligan <<A
href="mailto:wgalligan@goodsonacura.com">wgalligan@goodsonacura.com</A>></I></B>
wrote:</DIV>
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<DIV><FONT face=Arial size=2>What type of diode and would these be available
from Radio Shack?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>WG</FONT></DIV>
<DIV> </DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </D! IV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=bob@toprudder.com href="mailto:bob@toprudder.com">Bob
Richards</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, February 24, 2006 10:38
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] NiMH
Question</DIV>
<DIV><BR></DIV>
<DIV>>>>NiCad's normally fail shorted and you have enough power
to land. NiMh's normally fail open and you will need another airplane to
go with your new battery.<<<</DIV>
<DIV> </DIV>
<DIV>Some of the old radios (Proline, for instance) had diodes across each
cell in the airborne pack, in case a cell went open. Also, if a cell died
(lost voltage) it would minimize the problem by preventing a cell from
reverse charging.</DIV>
<DIV>
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