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| As always, we will
start by adding the control balls, this time to the tail
blade holders (grips) as shown above. YES, of course, the balls
should be free to rotate by themselves when tightened down.
Make sure the balls point away from the
tail grips in the direction shown. |
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| Shown above are
the parts you need to assemble to create one side of the
tail rotor system. All that you have to do is to push one
bearing into the tail blade grip from the OUTSIDE, then
slide the hub shown on the right into that bearing from the
other side. Put some THREAD LOCK
on the bolt, and tighten down as firmly as possible
To tighten the bolt, use a small
screwdriver to push through the hole in the hub to let you
tighten the bolt sufficiently. |
|
Repeat the process above on the
other side of the hub.
Check to make sure that both tail blade
grips rotate nice and easily on the hub.
Finally insert the tail blades as shown
below. Take extra care that you put the blades in the
correct way around in both grips as shown. Check
against the connecting ball positions if you are unsure.
Fit them with a self tapping screw, but DO
NOT TIGHTEN IT RIGHT DOWN. The tail blades should be able to
"flap" on the screws, but do not leave them TOO
LOOSE. |
Assembling the tail drive gearbox
Now we are going to assemble the gearbox
that converts the belt drive to the rotation of the tail
blades. |
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On the left are all the parts
we need to make our tail gearbox. Sounds a bit
intimidating doesn't it, but it's really quite
straightforward. |
| Yes, another connecting ball to
be fitted, same rules as for all other balls.
Make sure you get it in the correct way
around... |
|
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Now push the bearings into the
main gearbox casing sides from the inside of the casings.
The bearing can go in either way around. |
| Find the tail drive shaft
itself, and push it firmly through the bearing of the RIGHT
HAND CASING as far as it will go.
You can identify the RIGHT HAND CASING by
the fact that it has the mounting point for the control arm
shown a bit earlier. |
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Now it gets a little more
tricky, we need to run the rubber drive belt OVER the pulley
gear on the shaft that we have just fitted. |
| The next bit is even a little
bit more
tricky...
Take the LEFT HAND CASING, and while
keeping the rubber belt inside it the two casings, push them
together so that the end of the tail drive shaft goes through the
bearing on the LEFT HAND CASING.
But before you push them fully together,
insert the alloy tensioner wheel over the two short studs
provided for it in the top of the casings. |
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Now we need to screw both
halves of the casing together at the back using the screws
provided.
Do not put any bolts or screws in the two
front holes, they are used for mounting it on the boom and
fitting the vertical fin.
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| Get the tail drive hub that
come pre-assembled, and slide it over the tail drive shaft
as shown on the right |
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Insert the brass spacer through
the mounting hole in the tail control arm. |
| Push the bolt through the
spacer and control arm, and screw it onto the mounting arm
from the UNDERNEATH.
Before it is screwed down too far, make
sure that the plastic ball on the tail control hub is fitted
into the hole in the control arm.
Tighten it right down, but ensure the arm
can move nice and easily on the bolt. |
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Fit a grub screw into the
thread in the previously assembled blade grips loosely, then
slide it over the outer end of the tail drive shaft just far
enough so that the end of the shaft is flush with the
outside of the hub.
Make sure that the blade grips are
positioned as shown in the picture or you may not be able to
turn them to the correct position later. I know you
may think it looks wrong, but you are looking at it from
underneath.
Just pinch the grub screw onto the drive
shaft to hold the blade grips in place |
| Swing the small plastic ball
connector arms around and connect one to the ball on each of
the blade holders as shown on the right.
Pay attention to the direction of the
blades and the arms for the ball connectors. The ball
arms are on the REAR of the rotation, so the opposite side
to the leading edge of the blades as shown in the picture on
the right.
This is the view from ON TOP. |
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|
The next thing we are going
to need to do is to get the drive belt down the boom tube,
which is a fiddly process at best.
One good trick is to use the
long tail control rod, and pass the bent end through the
belt and then tape it in position as shown below.
Now get the tail boom, and identify the rear end, which is
the hole with a small locating hole in it, NOT the end with
the slot.
Push the control rod up the
boom from the back, and once it comes out of the front, use
that end to pull the belt all the way through as far as you
can.
WARNING - THE DRIVE BELT IS
GOING TO NEED TO HAVE EXACTLY ONE HALF TWIST IN IT (IN THE CORRECT
DIRECTION), SO YOU MUST NOT LET IT TWIST AT ALL ONCE YOU HAVE
PULLED IT THROUGH THE BOOM.
You can use electrical tape
or whatever else you have handy to tape it in position to
avoid it being twisted unknowingly.
Finally, you can now slide
the front end of the tail gear box over the REAR END of the
boom. Watch out for the small plastic that is used to
locate the tail gear box on to the boom. You may have
to force the tail box open slightly and wriggle it to get
that lug to locate securely in the hole in the boom.
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