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<DIV><FONT face=Arial size=2>Right on, Keith - I may have been one of those who
USED to say that - and perhaps others....and I can offer two REALLY good
reasons...</FONT></DIV>
<DIV><FONT face=Arial size=2> 1. Transmitters in ages
gone by could not "do" the mixing, atv'ng, expo, etc. needed.</FONT></DIV>
<DIV><FONT face=Arial size=2> 2. Non-Digital servos just
weren't available in a size to make it practical.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Nowadays, given if there is an option to use one or
two, I go with two digitals EVERY time.</FONT></DIV>
<DIV><BR>Bob Pastorello<BR>NSRCA 199 AMA 46373<BR><A
href="mailto:rcaerobob@cox.net">rcaerobob@cox.net</A><BR><A
href="http://www.rcaerobats.net">www.rcaerobats.net</A></DIV>
<DIV> </DIV>
<DIV> </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=tkeithb@comcast.net href="mailto:tkeithb@comcast.net">Keith Black</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, January 24, 2005 3:31
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Redundancy</DIV>
<DIV><BR></DIV>Amen! Not to mention that the stab servos are REAL easy to
setup.<BR><BR>When I was building my first pattern plane I asked about this
and got some<BR>negative feedback on the dual elevator servos. Reason given
was due to the<BR>halves not matching and servos wearing unequally. Well my
experience is that<BR>this hasn't been an issue at all and in fact it was
easier to get them<BR>perfect than with pull-pull.<BR><BR>I use the JR
DS3421SA servos in my stab, they are excellent!<BR><BR>Keith
Black<BR><BR><BR>----- Original Message ----- <BR>From: "Ron Van Putte" <<A
href="mailto:vanputte@cox.net">vanputte@cox.net</A>><BR>To: <<A
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A>><BR>Sent:
Monday, January 24, 2005 3:07 PM<BR>Subject: Redundancy<BR><BR><BR>>
There's been a lot of discussion about using two battery packs to<BR>>
provide extra capacity and redundancy. However, as Dean Pappas<BR>>
mentioned earlier, most battery packs fail shorted, so they still<BR>>
provide energy, albeit at reduced voltage and with limited current.<BR>>
However, I have seen many servos fail and their failure mode is
usually<BR>> "dead at neutral" or "dead hard over". Neither of these
modes of<BR>> failure is particularly conducive to airplane well
being. Most of us<BR>> use two aileron servos and having two aileron
servos saved two<BR>> different airplanes of mine. One servo failed
"dead at neutral" and<BR>> the other "dead hard over". The first was
not a problem. The second<BR>> was a struggle, but I got it on the
ground safely. After the second<BR>> servo failure on aileron, I
started using dual elevator servos on all<BR>> my airplanes. I
haven't had a servo fail on elevator yet, but, if one<BR>> does, I'll have
a fighting chance to get the airplane back on the<BR>> ground
safely.<BR>><BR>> Ron Van Putte<BR>><BR>><BR>>
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