Skid Landing Gear; Tail Rotor - GRAUPNER Jet Ranger Handbuch

Jet Ranger
The upper mechanics brace should now rest against the recess of the fuselage cut-out. Adjust
the position of the mechanics until the main rotor shaft exits the fuselage exactly centrally when
viewed from the front, and drill 1.5 mm Ø pilot-holes in the baseplate and the flange of the
fuselage cut-out. Fit a 2.2 x 6.5 mm self-tapping screw on each side to fix the parts together.
Place the upper fuselage fairing on the model and check that the main rotor shaft exits exactly
in the centre of the circular opening in the fairing; make adjustments as required.
When you are sure that everything fits properly, remove the self-tapping screws again, undo the
M3 socket-head cap screws and remove the upper braces. Thoroughly roughen the flange of
the fuselage cut-out where the baseplate contacts it, and re-install the braces after applying
UHU plus endfest 300. Fit the self-tapping screws again to ensure correct location until the
epoxy has set hard.
Allow the resin to cure fully, then undo the six mechanics retaining screws and remove the
mechanical assembly from the fuselage.

1.3.4 Skid landing gear

Press sealing plugs into both ends of the two skid tubes, and secure them with a drop of cyano.
Fit the tubes through the skid bars and allow the rear ends to project by about 35 mm. Now
position the front skid bar so that the distance between the retaining screw holes is 207 mm.
The skid bars are attached to the fuselage and mechanics by means of four M3 x 16 socket-
head cap screws. Set the curved end of the skid tubes exactly vertical when viewed from the
front, and fix them to the skid bars in this position using four 2.2 x 6.5 mm self-tapping screws.

1.4 Tail rotor

1.4.1 Installing the tail rotor
The tail end of the fuselage features a factory-fitted bulkhead and a pre-cut opening for the tail
rotor; you may need to trim the opening so that the tail rotor can be fitted neatly, but without
lateral play.
Set the tail rotor exactly horizontal, and secure it with three 2.9 x 13 mm self-tapping screws.
The tail features an all-round recess which accepts the tail cap. Before the tail cap is fitted you
will need to cut openings in the moulding to clear the tail rotor housing and actuating lever.
1.4.2 Tail rotor drive system
1.4.2.1 Cutting the tail rotor drive shaft to length
Place the mechanics in the fuselage. Slide the quick-release sleeve 4618.58 along the tail rotor
drive shaft to the point where the shaft's pre-formed end is located inside the sleeve, then slip
the collet 56.0 (with grubscrew fitted loosely for the moment) on the shaft. Fit the shaft in the
fuselage from the rear, coupling sleeve first. Engage the pre-formed end of the shaft in the
quick-release coupling yoke 4618.57, and slide the sleeve over it fully to close the coupling. Slip
the shaft into the coupling as far as it will go, and mark the point where the shaft exits the tail
rotor bulkhead; the correct length of the shaft is around 15 mm shorter than the marked point.
There must be about 1 mm axial clearance in the yoke at the front end; at the tail end the length
must take into account the installed length of the tail rotor (25.5 mm), measured from the
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