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<DIV>
<DIV><FONT face=Arial>The Al arms are quite resistant to twisting - but you're
correct that the nylon wheel is plenty strong and the Al wheel stronger than
either. </FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>A few years back I tested the strength of the JR 8411
Al spline and the equivalent nylon spline coupled to stock & H9 Al
arms. The test involved making an adaptor to set over a single arm and position
an inch-lb torque wrench directly over the shaft. An output gear / shaft was
clamped in a vise and the torque wrench used to measure the "give" point and the
failure point with different combinations. All exceeded the torque rating of the
servo.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Nylon shaft & arm: "Give" @ 320 oz in and failure @
480 oz in - the spline shaft twisted and slipped, arm spline damage (yet there
was enough binding to retain some control transfer).</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Nylon shaft & Al arm: "Give @ 320 oz in and failure @
560 oz in - shaft spline total failure.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Al shaft & nylon arm: No "give" point. Crisp failure @
560 oz in - arm spline total failure.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Al shaft & Al arm: No "give" point, Crisp failure @
1600 oz in - no spline damage, shaft broke below spine.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Earl</FONT></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=twtaylor@ftc-i.net href="mailto:twtaylor@ftc-i.net">twtaylor</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, August 31, 2007 9:09
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Metal
Servo Arms</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Last night I was
playing with them, they fit the plastic output gear just fine. I was trying to
get them on 8411sa’s with the metal splines. I finally did but they won’t go
down as far as a nylon arm. Using a magnifying glass I could see where the
alum arm is fully seated internally. Just looks different than with the
plastic arm, as the arm doesn’t cover the entire part of the splines at the
bottom like the standard arm does. I’m using this on elev with the MK bearing
fitting. I’m going to replace the rudder arm with a H9 as
well.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Tim<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<DIV>
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face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt">
<HR tabIndex=-1 align=center width="100%" SIZE=2>
</SPAN></FONT></DIV>
<P class=MsoNormal><B><FONT face=Tahoma size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT
face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">
<st1:PersonName
w:st="on">nsrca-discussion-bounces@lists.nsrca.org</st1:PersonName>
[mailto:<st1:PersonName
w:st="on">nsrca-discussion-bounces@lists.nsrca.org</st1:PersonName>] <B><SPAN
style="FONT-WEIGHT: bold">On Behalf Of
</SPAN></B>vicenterc@comcast.net<BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Friday, August 31, 2007 9:57
AM<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> NSRCA Mailing List;
NSRCA Mailing List<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B>
Re: [NSRCA-discussion] Metal Servo Arms</SPAN></FONT><o:p></o:p></P></DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt">Earl,<o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt">I wonder if the aluminum single arm will twist more
than the round nylon wheel in similar loads and conditions. Using MK
link (which are very close to the plane of the wheel) with round
nylon wheels has been working very well for me. The reason why the nylon
wheel is strong is because the structure is closed. Of course
aluminum wheel would be stronger than nylon
wheel.<o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P></DIV>
<DIV id=signature>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt">--<BR>Vicente "Vince"
Bortone<o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P></DIV>
<BLOCKQUOTE
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; MARGIN-TOP: 5pt; PADDING-LEFT: 4pt; MARGIN-BOTTOM: 5pt; PADDING-BOTTOM: 0in; MARGIN-LEFT: 3.75pt; BORDER-LEFT: #1010ff 1.5pt solid; PADDING-TOP: 0in; BORDER-BOTTOM: medium none">
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt">-------------- Original message --------------
<BR>From: "Earl Haury" <ejhaury@comcast.net>
<o:p></o:p></SPAN></FONT></P>
<DIV>
<P class=MsoNormal><FONT face=Arial size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: Arial">The nylon servo arms are quite
adequate when used with a clevis that applies the force in line with the
plane of the arm (typical pin clevis). Pushrod ends that bolt to one side of
the arm move the force off the plane of the arm and thereby impart a
twisting force to the arm. (DuBro type ball links are the extreme.) Add a
bunch of vibration to the normal loads and the nylon arm may eventually fail
- a wheel is a much better choice if one uses the nylon accessories. In
addition to better withstanding the twisting forces of offset linkage, the
aluminum arm is more substantial for screw mounting the ball / ball bearing
end.</SPAN></FONT><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face=Arial size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: Arial">Jim is correct regarding the H9
arms on JR servos - there seems to be more variation in the spline of the
output than the spline of the arm. (An arm tight on one servo may fit nicely
on another.) OTOH, I've found the H9 arms to fit Futaba servos consistently
well.</SPAN></FONT><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face=Arial size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: Arial">Earl</SPAN></FONT><o:p></o:p></P></DIV>
<BLOCKQUOTE
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; PADDING-LEFT: 4pt; PADDING-BOTTOM: 0in; MARGIN: 5pt 0in 5pt 3.75pt; BORDER-LEFT: black 1.5pt solid; PADDING-TOP: 0in; BORDER-BOTTOM: medium none">
<DIV>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">----- Original Message -----
<o:p></o:p></SPAN></FONT></P></DIV>
<DIV style="font-color: black">
<P class=MsoNormal style="BACKGROUND: #e4e4e4"><B><FONT face=Arial
size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">From:</SPAN></FONT></B><FONT
face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> <A
title=vicenterc@comcast.net
href="mailto:vicenterc@comcast.net">vicenterc@comcast.net</A>
<o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><B><FONT face=Arial size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">To:</SPAN></FONT></B><FONT
face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> ; <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A>
<o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><B><FONT face=Arial size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">Sent:</SPAN></FONT></B><FONT
face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">
Friday, August 31, 2007 7:28 AM<o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><B><FONT face=Arial size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Arial">Subject:</SPAN></FONT></B><FONT
face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"> Re:
[NSRCA-discussion] Metal Servo Arms<o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt">For pattern I always use the nylon servo arms that
comes with the JR servos. I am not sure why you need the metal servo
arms. Usually I use the round one for aileron and elevator.
For rudder I use the heavy duty arm that JR offers (comes in the 8611
servo). I never have problems with the nylon servo arms in pattern
application.<o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt">Regards,<o:p></o:p></SPAN></FONT></P></DIV>
<DIV id=signature>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt">--<BR>Vicente "Vince"
Bortone<o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P></DIV>
<BLOCKQUOTE
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; MARGIN-TOP: 5pt; PADDING-LEFT: 4pt; MARGIN-BOTTOM: 5pt; PADDING-BOTTOM: 0in; MARGIN-LEFT: 3.75pt; BORDER-LEFT: #1010ff 1.5pt solid; PADDING-TOP: 0in; BORDER-BOTTOM: medium none">
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt">-------------- Original message --------------
<BR>From: Bob Richards <<A
href="mailto:bob@toprudder.com">bob@toprudder.com</A>>
<o:p></o:p></SPAN></FONT></P>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt">I've used the H9 arms and the SWB arms. No
comparison, I will continue to use the SWB
arms.<o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt">Bob R.<o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"><BR><BR><B><I><SPAN
style="FONT-WEIGHT: bold; FONT-STYLE: italic">Kelly Regan
<kelly.regan2@verizon.net></SPAN></I></B>
wrote:<o:p></o:p></SPAN></FONT></P></DIV>
<BLOCKQUOTE
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; MARGIN-TOP: 5pt; PADDING-LEFT: 4pt; MARGIN-BOTTOM: 5pt; PADDING-BOTTOM: 0in; MARGIN-LEFT: 3.75pt; BORDER-LEFT: #1010ff 1.5pt solid; PADDING-TOP: 0in; BORDER-BOTTOM: medium none">
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt">Not an answer to your question but I find the
SWB arms much nicer<BR>since they are split. They use a a 2/56 clamp
screw and nylon locking<BR>nut to draw the clamp tight around the
spline of the servo shaft.<BR><BR>twtaylor wrote:<BR>><BR>> I
bought some Hanger 9 alum servo arms and when I put them on they are
<BR>> VERY hard to get to pull down on to the servo.
Is<BR>><BR>-- <BR><BR>________________________________<BR>Kelly
Regan<BR>Home Page:
www.reganspace.com<BR>________________________________<BR><BR>_______________________________________________<BR>NSRCA-discussion
mailing
list<BR>NSRCA-discussion@lists.nsrca.org<BR>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion<o:p></o:p></SPAN></FONT></P></BLOCKQUOTE>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P></BLOCKQUOTE>
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face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt">
<HR align=center width="100%" SIZE=2>
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<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt">_______________________________________________<BR>NSRCA-discussion
mailing
list<BR>NSRCA-discussion@lists.nsrca.org<BR>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion<o:p></o:p></SPAN></FONT></P></BLOCKQUOTE></BLOCKQUOTE></DIV>
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