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Fitting the control arms to the upper frame
We are now going to get down to some quite
technical stuff, so please do pay attention to the details in this
section.
Our partial upper frame is at the back, and in
front are the various arms that are going to need to be connected
CORRECTLY to the frame to allow the servos to connect to the swash
plate and work efficiently.
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As has been the case in
previous assemblies, one of the first things to do is to fit
the Ball connectors to the various arms and
links.
And yes, you must know what is coming by
now - make sure the balls can rotate freely on their
mounting bolts when tightened down.
Take special note of the direction the
balls are fitted on each arm to make sure you get them the
correct way around on each arm |
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| This is how the two bell cranks
should look when the balls have been fitted correctly. |
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When fitting the ball to the
elevator arm, make sure that the countersunk side is AWAY
from the connecting ball. |
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| Identify the long COUNTERSUNK
BOLTS, and slide one into the hole shown in the picture on
the right. Then find the alloy spacer as shown and put it
over the bolt in the correct direction. |
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|
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Take one of the two bell crank
arms you fitted connector balls to previously, and slide one
over the alloy spacer. Ensure you get them the right way
around.
Finally, put on a nylock nut, but do not
OVER TIGHTEN the nut, it will lock down onto the alloy
spacer, not the bell crank arm, and should leave it free to
move automatically. If necessary,
use a screwdriver to hold the head while you tighten the
nylock nut. |
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| Repeat the process above for
the second arm. Both bell cranks should have the balls
facing the same way, as shown on the right. |
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|
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Fit the aileron servo mounting
tray onto one of the control arms with self tapping screws.
NB - Make sure that the FLAT SIDE is uppermost so that the
servo will fit on it nice and flat.
Tighten both screws down
firmly |
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| Now you need to insert the
elevator control arm inside the frame. Care needs to be
taken here as the two pivots are different, and the one with the extended end with flats on
it MUST BE sticking out of the side of RIGHT HAND FRAME. You
can see that this is the longer shaft on the far side of the
first picture
You may have to wriggle it around a bit to
get the arm inside the frame, but once in position, just let
it sit in the hole |
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| Now we are going to fit the two
long control arms onto the elevator control arm and the
cross shaft that we have already fitted into the frame.
Identify the two small
brass washers first, as these go onto the shaft shown at the
front on the right in the picture BEFORE the long arms are
attached. |
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|
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Drop one end of one of the
metal arms over the end of the elevator control arm, and
then position the second hole on top of the brass washer so
that the end is flush with the arm
Here is the bell crank fitted onto the
RIGHT HAND FRAME, with the brass
washer between the frame and the connecting arm. |
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| Fit the retaining screw to hold
the arm into the alloy rod using THREAD LOCK, but be careful not to get any thread lock on the
bearing itself
Tighten it fully...
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Now fit the metal connecting
arm on to the other side in the same way - don't forget the
brass washer.... or the Thread lock.
Don't fit the 2 remaining screws to hold
the aileron servo mounting tray to the arms just yet.
The final stage is on the RIGHT HAND
FRAME, and it is to fit the short control arm to the
elevator control arm.
Make sure that you fit it with the
recessed side inwards, and that you locate it over the two
flats accurately.
Use a self tapping screw and tighten the
arm up firmly onto the elevator control arm. |
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| The almost final task for these
arms is to fit a connecting ball to the newly fitted arm -
YES, as always, make sure the ball can rotate freely once
tightened down. |
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|
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Last bit is to fit the mounting
for the aileron servo between the front ends of the
connecting arms you have just fitted. Use THREE self
tapping screws, but use the normal connecting ball screw for
the front left and fit a control ball there - YES - Sorry to
nag, but make sure it can rotate freely after tightening
down. |
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That's it for the upper frame so
far...
Your frame should look the one
shown below ?????
Are you sure you have used
thread lock in ALL screws that go INTO METAL ?
Are you sure that all the screws
have been fully tightened down ?
Are you sure that all the balls
can rotate freely on their fitting bolts ?
VERY WELL DONE
IF YOU ANSWERED YES TO ALL THE ABOVE QUESTIONS
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