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Fitting the linkages between the
servos and the rotor head
This next step is one you will want to study quite
carefully, as getting the correct rods in the correct places, and at
the right angles, is pretty important.
 |
The first ones (the link arms)
are the only ones that actually come ready for use, for as you can
see they are one piece of plastic with connecting eyes at both
ends.
You cannot really get these wrong, but
PLEASE NOTE THAT ALL OF THE PLASTIC CONNECTING EYES FIT A LOT MORE
EASILY WHEN PUSHED OVER THE BALL FROM ONE SIDE RATHER THAN
THE OTHER.
This applies to most of the connectors, and if
you look at the links carefully you can see that one side is
slightly more open than the other side, so always push them
over the balls with the more open side going on FIRST. |
| This view on the right shows
you the possible trap there is with these particular links.
In the picture on the right, you can see
clearly that these arms drop down and fit onto the SHORTER
end of the mixer arms. This is most important, for if you
assemble the head with these connected to the LONGER end of
the arms, you will not be able to fly the helicopter as it
will have a massive pitch movement
Also note that the connections to the
blade holders are on the BACK of the main rotor blade grip,
so that they are behind the blade when it is rotating clockwise. |
 |
 |
Now we need to start making the
rest of the linkage arms ourselves. starting with the
shortest threaded rod. These all use a normal clockwise
thread on BOTH ends.
Screw each end on to the rod an equal
distance and keep checking it until the gap between the
bottom of each plastic link is 6.5mm.
Always keep the same amount of thread
visible on BOTH ends.
We need TWO of these links... |
| These links fit between the
flybar control arm and the mixer arms, as shown on the
right. You cannot get these wrong as the other end is
already connected to the swash plate by this time. ? |
 |
 |
Now we need of the next size
up, and these should have a gap of 20.5mm between the bases
of the plastic connectors. We are going to require 4 of
these.
Two of them go from the OUTER swash plate
connectors on each side down to the 90 degree bell cranks on
either side. Make sure you connect them to the right
arm of the bell crank on each side.
The other two at front and back of the
swash plate connect to the ends of the
elevator control arm inside the frame. |
| Here we are with all four rods
connected to the swash plate. |
 |
 |
The last set are the longest
rods, and need to be 22.5mm between the bases of the
plastic connectors.
They fit onto the other two balls on the
INNER swash plate, and go up to connect to the washout arms
at the very top. NOTE that they fit on the longer ends of
the washout arms. |
|
AND THIS IS WHAT YOUR HELICOPTER
SHOULD BE LOOKING LIKE NOW...
Finally, we can move on to
making the connecting arms that we are going to need to fit
between the servos and the control bell crank arms, but only
once we have installed the servos...
| As you can see, these
have preformed bent ends at one end, and threads on
the other. Two of these rods are the same size, the other
two are different lengths.
The manual shows you exactly how
long these links should be from the bend to the
connector.
Make them up and put safely to one
side. |
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