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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Just to follow up on yesterday’s
email – I finished the YS install last night and it went just like I
thought it would – easy. Besides a pesky blind-nut, which I ultimately
removed all in favor of locking nuts, this was the easiest and most precise
install I’ve done yet. Installing the nose-ring first, then supporting the
assembly with a temporary spacer beneath the motor mount, made the process much
easier. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Each install is somewhat dependant on the
airframe, but I do think that starting with the idea of removing the building
tolerances is the best way to go. The glue joints for the nose-ring are the
smallest and easiest to control. Without the firewall installed, you have
GREAT access to the nose of the plane. Then, with the entire assembly secured
to the nose-ring and supported by the spacer, you can easily fit the firewall
to the back of the motor mount and plane. The idea being that the firewall
should be able to press against the back of the mount without pressuring or
deforming the fuselage. So, off to other areas – hardest part was easily
done this way.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks,<o:p></o:p></span></font></p>
<p class=MsoNormal><st1:PersonName w:st="on"><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>Jim</span></font></st1:PersonName><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'> W.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Woodward, <st1:PersonName w:st="on">Jim</st1:PersonName><br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, August 08, 2007
10:30 AM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">NSRCA
Mailing List</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> [NSRCA-discussion] YS
Engine Mounting in Composite plane - reducingvariables</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi Guys,<u1:p></u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>You know that mounting a motor setup is a difficult task at
best to get perfectly done. The main problem is that there are so many
variables to be addressed all at once like: <u1:p></u1:p></span></font><o:p></o:p></p>
<ol style='margin-top:0in' start=1 type=1>
<li class=MsoNormal style='mso-list:l1 level1 lfo1'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Spinner position</span></font> <o:p></o:p></li>
<u1:p></u1:p>
<li class=MsoNormal style='mso-list:l1 level1 lfo1'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Nose-ring position</span></font>
<o:p></o:p></li>
<u1:p></u1:p>
<li class=MsoNormal style='mso-list:l1 level1 lfo1'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Firewall position</span></font>
<o:p></o:p></li>
<u1:p></u1:p>
<li class=MsoNormal style='mso-list:l1 level1 lfo1'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Resultant thrust angles</span></font>
<o:p></o:p></li>
<u1:p></u1:p>
<li class=MsoNormal style='mso-list:l1 level1 lfo1'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Angle or motor tilt within the
space</span></font> <o:p></o:p></li>
<u1:p></u1:p>
<li class=MsoNormal style='mso-list:l1 level1 lfo1'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Matching flat surfaces together
in a ½ blind situation (backplate of mount to firewall). <u1:p></u1:p></span></font><o:p></o:p></li>
<li class=MsoNormal style='mso-list:l1 level1 lfo1'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Small angle sag of mount with
engine installed (happens to any mount that is intended to be used with a
nose-ring).</span></font> <o:p></o:p></li>
</ol>
<u1:p></u1:p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The typical mounting procedure I’ve been aware of and
using is something like this:<u1:p></u1:p></span></font><o:p></o:p></p>
<ol style='margin-top:0in' start=1 type=1>
<li class=MsoNormal style='mso-list:l0 level1 lfo2'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Mount the engine to the mount</span></font>
<o:p></o:p></li>
<u1:p></u1:p>
<li class=MsoNormal style='mso-list:l0 level1 lfo2'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Place this assembly into the
plane</span></font> <o:p></o:p></li>
<u1:p></u1:p>
<li class=MsoNormal style='mso-list:l0 level1 lfo2'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Mount the spinner backplate to
the motor with a thin spacer (I use 1/8” spacer)</span></font> <o:p></o:p></li>
<u1:p></u1:p>
<li class=MsoNormal style='mso-list:l0 level1 lfo2'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Jostle this into position then
rough-out a firewall.</span></font> <o:p></o:p></li>
<u1:p></u1:p>
<li class=MsoNormal style='mso-list:l0 level1 lfo2'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>When you think you got the
firewall sized right, tape the spinner to the plane, turn plane vertical,
glue firewall in place – cross fingers</span></font> <o:p></o:p></li>
<u1:p></u1:p>
<li class=MsoNormal style='mso-list:l0 level1 lfo2'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Return after glue dries, create
a nosering then prey more. Admire the work with a tinge of
disappointment then…..</span></font> <o:p></o:p></li>
<u1:p></u1:p>
<li class=MsoNormal style='mso-list:l0 level1 lfo2'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>…. Create a small shim to
get the correct thrust angles after you realize you are off a hair….
(I’m sure no one else has had to this right??)</span></font> <o:p></o:p></li>
</ol>
<u1:p></u1:p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>This time around while working on a YS installation in an
Abbra I decided to reverse this scenario entirely and make attempts to reduce
the number of variables and tolerance build up. The easiest thing to get
right and fixed is the center of the nose and spinner location. So, step
#1 was to:<u1:p></u1:p></span></font><o:p></o:p></p>
<ol style='margin-top:0in' start=1 type=1>
<li class=MsoNormal style='mso-list:l2 level1 lfo3'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Install nose ring phenolic disk
that I predrilled for a Central Hobbies nose-ring.</span></font> <o:p></o:p></li>
<u1:p></u1:p>
<li class=MsoNormal style='mso-list:l2 level1 lfo3'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Once this was installed I can
position the motor and mount assembly through the nose-ring with the
nose-ring actually mounted to the plane. This allows for some
“movement” of the back of the motor to fine-adjust the
resulting thrust angles.</span></font> <o:p></o:p></li>
<u1:p></u1:p>
<li class=MsoNormal style='mso-list:l2 level1 lfo3'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>*New step – maybe you
guys were already doing this – Make a temporary spacer to lift and
position the motor mount in the free space of the engine compartment.
This spacer places the motor & mount assembly into a fixed position to
you can see the resultlant thrust angles.</span></font> <o:p></o:p></li>
</ol>
<u1:p></u1:p>
<ol style='margin-top:0in' start=3 type=1>
<ol style='margin-top:0in' start=1 type=a>
<li class=MsoNormal style='mso-list:l2 level2 lfo3'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Once done, the motor is
resting just where it needs to be without any pressure, forces, or chance
while you can now trial fit the firewall.</span></font> <o:p></o:p></li>
</ol>
</ol>
<u1:p></u1:p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Firewall:<u1:p></u1:p></span></font><o:p></o:p></p>
<ol style='margin-top:0in' start=1 type=1>
<li class=MsoNormal style='mso-list:l3 level1 lfo4'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>However you got this, now you
can trial fit it to the exact repeatable location every time because the
motor and mount are installed in the plane (… with nose-ring already
fixed – exactly where you want it to be for flight) (positioned by nose-ring
and temporary spacer).</span></font> <o:p></o:p></li>
<u1:p></u1:p>
<li class=MsoNormal style='mso-list:l3 level1 lfo4'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Once you get the fit you want,
tack glue the mount to the firewall and unscrew the NOSE-RING from the
front on the plane. <u1:p></u1:p></span></font><o:p></o:p></li>
<li class=MsoNormal style='mso-list:l3 level1 lfo4'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>At this point the entire
assembly lifts out of the plane</span></font> <o:p></o:p></li>
<u1:p></u1:p>
<li class=MsoNormal style='mso-list:l3 level1 lfo4'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Remove engine from mount</span></font>
<o:p></o:p></li>
<u1:p></u1:p>
<li class=MsoNormal style='mso-list:l3 level1 lfo4'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Mark exact location of drill
points for motor mount</span></font> <o:p></o:p></li>
<u1:p></u1:p>
<li class=MsoNormal style='mso-list:l3 level1 lfo4'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Drill, fix, with blind nuts.</span></font>
<o:p></o:p></li>
<u1:p></u1:p>
<li class=MsoNormal style='mso-list:l3 level1 lfo4'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Reassemble mount, motor, and
install into plane with NOSE-RING screws to disk.</span></font> <o:p></o:p></li>
<u1:p></u1:p>
<li class=MsoNormal style='mso-list:l3 level1 lfo4'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Re-check for firewall fit and
glue.</span></font> <o:p></o:p></li>
</ol>
<u1:p></u1:p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>At this point I have everything done up till the tack-glue point
of the firewall to the mount. I should get through it tonight and
tomorrow. Maybe you guys were already doing it this way, but this is the
fist for me and using this approach has take some chance and tolerance build up
out of the equation.<u1:p></u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><u1:p> </u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks,<u1:p></u1:p></span></font><o:p></o:p></p>
<p class=MsoNormal><st1:PersonName u2:st="on"><st1:PersonName w:st="on"><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Jim</span></font></st1:PersonName></st1:PersonName><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> W</span></font><u1:p></u1:p><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
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