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<DIV><FONT face=Arial size=2>Hi Earl,</FONT></DIV>
<DIV><FONT face=Arial size=2>Good work. I recently had a spline break off
of a Hitec "carbonite" output gear. I believe it was due to the output arm
screw being too short. The replacement screw is longer and threads through
the spline into the gear itself. Wondered how deep your screws went and if
they would help to hold the splines on?</FONT></DIV>
<DIV><FONT face=Arial size=2>Jim</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=ehaury@houston.rr.com href="mailto:ehaury@houston.rr.com">Earl
Haury</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> Thursday, July 29, 2004 7:24
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: 8411 and 8411SA torque
specs.</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>The fail point of the 8411 output shaft / spline
(gear held in chuck) for one sample each is:</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Plastic shaft / arm - shaft spline failure @ 480
oz in</FONT></DIV>
<DIV><FONT face=Arial size=2>Plastic shaft / Al arm - shaft spline failure @
560 oz in</FONT></DIV>
<DIV><FONT face=Arial size=2>Metal shaft / Al arm - shaft failure @ 1600 oz
in</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>The plastic spline failures still retained enough
"friction" to have control - albeit out of trim.</FONT></DIV>
<DIV><FONT face=Arial size=2>The metal shaft broke immediately below the
splines. (I've seen this occur on big gassers also.)</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>None of this addresses gear strength, (I did
this experiment because some heli guys said that the metal arms stripped
the splines on both the plastic and metal output shafts.) but as Richard
points out, the metal will take more abuse.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Earl</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=richard.s@allied-callaway.com
href="mailto:richard.s@allied-callaway.com">Richard Strickland</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> Thursday, July 29, 2004 8:59
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: 8411 and 8411SA torque
specs.</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>From a strictly mechanical point of view and as
a practical matter--and all gear sizes being equal, the metal gears will
take more ABUSE. The rating would be driven by the torque of the
driver, in this case--the motor. Less likely to strip them out on hard
landings or whacking surfaces on the tailgate. It would be interesting
to do a study on air loads in a typical pattern ship on what the ideal
ratings would be--probably much lower than many of us think!</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Richard</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=wkrueger1@wi.rr.com href="mailto:wkrueger1@wi.rr.com">Bill
Krueger</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">NSRCA</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, July 28, 2004 9:55
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> 8411 and 8411SA torque
specs.</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial>I found that the torque rating from JR on the
8411 and 8411 SA are the same! </FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>I would think that this means that the SA
plastic gear version is capable of handling the same torque as the metal
gear, at least I would hope it means their "toughness" is the same.
</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>I would expect that if the SA versions gears could
not handle the torque without failing that they would rate the two servos
differently.....What I am getting at is if the ratings are the same why
would a person ever use the metal gear version? If the ratings are
the same than the plastic SA's gear train must be just as tough as the
metal gear 8411.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>In other words can I use the 8411SA on a 35% plane
with as much confidence as using a 8411 metal gear?</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT
face=Arial>flierbk</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>