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Making and fitting the mixer assembly
This is the last bit we need to assemble before we
can move on to putting them all together to make the mainshaft and
rotor head assembly.
 |
The main parts for the mixer
assembly are shown on the left.
You need to be very
careful when assembling this as it is very easy to get parts
the wrong way around.
In particular, check and recheck the fly
bar holder, as if you get it back to front, you will not be
able to set the pitch up correctly for the helicopter at
all. |
The first thing to do is to insert the fly bar
holder into the main mast top casing the correct way around, and to
fit it there. The parts required for this task are shown below.
 |
|
|
Pick up your previously
partially assembled rotor head, lay it on the bench, and carefully
insert the flybar holder through the large hole in the main
mast top casing as shown below. You will need to
rotate it around to get it through the hole.
|
Once the fly bar holder is sitting inside the head
casing, make sure that it is aligned as shown in the picture below.
In particular, note the blade holder ball is BEHIND the blade holder
with the rotor head rotating clockwise, and the cut away on the near end and the arm fitting
stub that projects outward on the other end of the flybar holder. THIS MUST BE
ASSEMBLED THIS WAY AROUND.
What you should end up with when the washout arms
are fitted is that the SHORTER END of each washout lever connects to
the ball on the Blade holder. If you get this the other way
around it will still appear to fit, but will be VERY WRONG.....
Take the brass top hat washer and push it through
the hole in the main mast casing from the OUTSIDE as shown below.
insert the screw through the top hat washer and screw into the hole
in the fly bar holder. DO NOT TIGHTEN TOO MUCH JUST YET.
Now repeat this process with the other side, and
finally, tighten both screws down as firmly as you can, but make
sure that they do NOT make the fly bar hold bind at all.
Now we will fit the connecting balls to the mixer
arms themselves.
| Note the direction
the balls are fitted...
As in all previous
cases, ensure that the balls can turn on their fitting
screws, and then fit them so that the balls are able to
rotate freely by themselves.
Fit the balls to both mixer arms. |
|
| On the right are
the bearings and spacers used to fit each mixer arm to the
fly bar holder.
You need to press one bearing into the
mixer arm from one side, then turn the arm over, drop the
spacer in place on the inside of that bearing, and press the
second bearing in on top of the spacer. The bearing
will usually press in quite easily with your fingers. Don't forget this spacer - it is important to
ensure the arms can move freely. |
 |
| The next thing to
do is to push the bolt through the bearings and spacer from
the OUTSIDE of the mixer arm. This is ALWAYS THE
OPPOSITE SIDE FROM THE CONNECTING BALLS. |
|
Above is the completed mixer
arms assembly.
NB - please check that yours looks exactly like this, with
the long and short ends of each of the mixer arms in the
same direction as shown here. (confirm by the the shape of
the cut outs in the fly bar holder) Now we need to add the flybar rocker, which is a
simple task. First of all, fit connecting balls to
either side, making sure that the balls can rotate freely
once tightened down. Use a hex driver or allen key to
fit the grub screws in the holes proved, but DO NOT TIGHTEN
THEM DOWN AT ALL. Once
the above is done, slide the rocker frame up over the mixer
arms with the GRUB SCREWS FACING UPWARDS for easier access
later, and locate it on each end of the fly bar
holder. Take the fly bar and push it through the fly
bar rocker arm and then all the way through the flybar
holder and out through the other side of the rocker frame as
shown in the picture below - right. Use a ruler, or Vernier calipers if you have some,
and carefully adjust the length of fly bar that protrudes at each end
until they are both exactly the same length. Then add
some thread lock to the grub screws and tighten down
fully. BE CAREFUL NOT TO STRIP THE THREADS OR GRUB
SCREW HEAD.
The flybar rocker
arm |
The completed head |
| The last
thing to do now is to add the flybar paddles. A
little unusually, these
are NOT threaded, so all you need to do is to push
one of them all the way onto the flybar, and lightly
pinch the grub screw to hold it in position. Now do
the same with the other one. Each blade must
point in the correct direction, which is with the
thicker edge facing forward in a clockwise
direction, as this helicopter rotates it's rotor
blades in that direction.
Align each fly bar
paddle so that it is exactly parallel to the fly bar
rocker, with each pointing in the opposite direction
to the other, as shown below. Check to make sure
that each blade is exactly the same distance away
from the edge of the fly bar rocker, and if not
adjust the shorter one outwards until it is exactly
the same distance away from the rocker arm as the
longer one. Add thread lock and fully tighten the
grub screws on the paddles onto the fly bar, keeping
the paddles exactly parallel to
the rocker arm.
WARNING
- BECAUSE THERE IS NO THREAD IN THE PADDLES (or fly
bar ends),
THEY COULD FLY OFF UNLESS THEY ARE FIXED REALLY
SECURELY
|
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