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<DIV><SPAN class=169130322-24012005><FONT face=Arial color=#0000ff size=2>Hi
All,</FONT></SPAN></DIV>
<DIV><SPAN class=169130322-24012005><FONT face=Arial color=#0000ff size=2>Many
moons ago, before digitals, I tried dual elevator servos and didn't like it one
bit. I am going to re-try with digitals, soon. I expect
success.</FONT></SPAN></DIV>
<DIV><SPAN class=169130322-24012005><FONT face=Arial color=#0000ff
size=2>Later,</FONT></SPAN></DIV>
<P><FONT face="Times New Roman">Dean Pappas</FONT> <BR><FONT
face="Times New Roman">Sr. Design Engineer</FONT> <BR><FONT
face="Times New Roman">Kodeos Communications</FONT> <BR><FONT
face="Times New Roman">111 Corporate Blvd.</FONT> <BR><FONT
face="Times New Roman">South Plainfield, N.J. 07080</FONT> <BR><FONT
face="Times New Roman">(908) 222-7817 phone</FONT> <BR><FONT
face="Times New Roman">(908) 222-2392 fax</FONT> <BR><FONT
face="Times New Roman">d.pappas@kodeos.com</FONT> </P>
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<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> discussion-request@nsrca.org
[mailto:discussion-request@nsrca.org]<B>On Behalf Of </B>Bob
Pastorello<BR><B>Sent:</B> Monday, January 24, 2005 4:38 PM<BR><B>To:</B>
discussion@nsrca.org<BR><B>Subject:</B> Re: Redundancy<BR><BR></FONT></DIV>
<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>
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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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