Chapter – V
C h a s s i s
( Assembly Group 2 )
Pre-assembly of the upper part of the chassis
(Bag 2-I)
Put the bearing supports 0221/0222 with their bearings 0223 on the already pre-mounted intermediate shaft unit
and main shaft unit, such that the bearings looking out of the one side of the support point to the gears !
The bearings of the lower supports point to the top - and the bearings of the upper supports point out to the bottom. At first,
tighten the units with the bearing supports loosely on a chassis side-frame plate as shown on the drawing (do not yet tighten
the screws).
Attention!
one of the plates has got a bigger gap on one side which is marked with a black cross. This plate has to be used as
upper support for the intermediate shaft 0510 with the marked side to the front in direction to the motor.
Attention!
Use the dome head screws 0254 without the additional washers for the front hole of the upper main rotor shaft
frame plate. For all other holes small M3 washers 0257 and M3x 8 caphead screws 0255 are used (for all these screws
Loctite is not necessary).
(Bag 2-II)
At first one M3 nyloc nut 0237c is tightened using Loctite on only one side of three M3 threaded rods 0237a for the
tail boom holders, so that the threaded rod protrudes from the nut by approx. 0.5mm. Later, this nut shall not turn when
loosening or tightening the opposite nut to attach the tail boom. Otherwise the threaded rod protrudes unevenly on one side.
Now push three of the prepared threaded rods through the corresponding holes from the outside using a large M3 washer
(according to drawing). The canopy mount 0236 is added to one side of the fourth threaded rod, which is then moved through
the rear upper hole of the chassis without using a washer.
Attention!
During the assembly of the tail boom holders note that the clamping slots point down.
Now assemble the second frame plate from the second side. Place the lower edge of the frame plates of the mechanics on
an even ground and alternately tighten the screws only slightly at first.
Attention!
If the vertical distance of the frame plate holes of the pre-mounted shaft unit is larger than the distance of the
chassis side-frame plate holes, the upper 0.5mm spacer washer under the upper frame plate has to be replaced by thinner
spacer washers from the enclosed bag with the additional spacer washers.
The lower nuts of the tail boom holders are screwed only loosely on the threaded rod, but not yet tightened!
Adjustment of the axial play of the main rotor shaft
At first, the axial play of the main rotor shaft is removed by adding spacer washers (can be found in the corresponding
assembly group bag) between the upper frame plate and the spacer 0412.
In order to do so, push the rotor shaft with the gear completely to the bottom against the bearing of the lower frame plate and
measure how far it protrudes from the top of the upper frame plate using a depth gauge of a calliper.
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