Specifications
To fix this problem, take some extra-fine steel wool (#000) and spread it with your fingers to
make a very thin mesh. This mesh should be about 1 inch by 1 inch and be mostly air with
about 50 or 60 strands of steel wool running through it.
Remove the flybar seesaw, then put the steel wool mesh on top of the pivot, then mash the
seesaw on top of it so the steel wool is trapped between the pivot and the seesaw. The
seesaw should snap on with moderate pressure; if you need too much pressure then your
steel wool mesh is too thick.
Now wiggle the seesaw up and down about 10 times, then remove the steel wool and
check if the seesaw pivots smoothly. If it still does not pivot smoothly, then repeat this pro-
cess. Do not repeat more than twice because this will wear out the pivot. For the final finish,
apply some powdered graphite onto the pivot. After this, the seesaw should move very
smoothly.
• Pg 10: The flybar (67609) usually does not rotate smoothly in the flybar seesaw (67610).
You MUST make the flybar seesaw rotate smoothly in the flybar seesaw otherwise the heli
will be very difficult to hover. You will need to push the flybar through the flybar seesaw re-
peatedly (like playing a violin) for about 5 minutes until the rod slides smoothly through the
flybar seesaw. This will make the heli much more stable and easier to hover.
• Pg 11/update: (Advanced) You can give make a free tail pitch slider upgrade by installing a
brass ball on the outer slide ring (67643). You must do this modification BEFORE the
needle bearing (67644) is installed inside the outer slide ring. Cut off the plastic ball from
the outer slide ring, then drill a 1.5 mm hole where it was. Take an M2x8 screw and a brass
ball, and screw it into the 1.5 mm hole. Look inside the outer slide ring and check how
much of the screw protrudes inside. Remove the screw and trim it to size, then CA the
screw and brass ball into the outer slide ring.
• Pg 12: The diagram does not show this, but you will need to bend the top of the 93mm ball
link very slightly (maybe 5-10 degrees) to ensure it does not rub against the flybar when the
swashplate is at the bottom of its travel. Check to make sure the ball link does not rub
against the flybar seesaw (67610) when the swashplate is moved up and down. If the ball
link rubs against the flybar seesaw, then reduce the angle of the bend. This bend slightly in-
creases the usable negative pitch range.
• Pg 13: The tail rotor shaft (67550) is asymmetrical and one notch is closer to one end than
the other. The shaft end with the notch FARTHER from the end should slide into the pulley
(67702), not the blade grip hub (67549).
• Pg 13: The tail blade grips (67542) should controlled by the leading edge of the blade, and
not the trailing edge. If the tail blade pitch is controlled by the trailing edge, the tail may
wag. Double-check and make sure the Ikarus logo on the tail blades is visible from the right
side of the heli, and the control ball for the tail blade grips is on the leading edge of the
blade.
• Pg 13: There is a serious problem on this page. In some versions of the English manual,
the instructions do not mention using threadlock on the screw holding the tail blade grip
(67603) to the tail hub (67549). The German version of the manual correctly tells you to use
threadlock on this screw. If you fail to do this your tail rotor grip may fall apart in flight caus-
ing the heli to pirouette out of control. Do not skip the threadlock on this screw! Also, if you
disassemble and reassemble the tail rotor later, don't forget to reapply fresh threadlock on
this screw!!
• Also, be sure the screw tail blade grip is left slightly loose so it can rotate freely on the ball
bearing and screw. If the tail blade grip is screwed too tightly to the tail rotor hub, then the
tail may "wag" because the mechanics may bind and gyro will have trouble controlling the
tail blade pitch.
Helicopter Construction
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