GRAUPNER heim Starlet 50 Mode D'emploi page 82

Starlet 50
The front shaft coupling can now be prepared; you must work carefully here, as the coupling
must engage automatically inside the tail boom without you being able to see what is
happening, and without using tools. For this reason it is important that the brass coupling sleeve
4618.58 is an easy sliding fit over the coupling yoke 4618.57. If necessary, remove any rough
edges from the yoke, or reduce it in size slightly using fine abrasive paper. Slide the tail rotor
drive shaft, Order No. 4451.19, into the coupling sleeve, and push it fully forward so that the
pre-formed part engages inside the sleeve. Fit a grubscrew in the collet 56.0, slide it along the
tail rotor shaft and position it just aft of the sleeve. Push the tail rotor shaft into the coupling yoke
as far as it will go, then slide the sleeve over the yoke to the same extent. Position the collet on
the shaft with about 1 mm clearance to the sleeve, and tighten the grubscrew fully.
7.4 Completing the tail boom
Fit the tail rotor flange 1292.7 on the rear end of the tail boom, then slide a support flange
1292.6 along the boom as shown in the drawing. Note that the gap in the support flange must
be on top, and the moulded-in bored lug must be on the left-hand side.
If you intend to use a tuned pipe silencer, you will need to install an additional support for it on
the tail boom, forward of the tail boom brace flange, as shown in the drawing. The parts for this
are not included in the kit, and must be purchased separately.
7.5 Determining the correct length of the tail rotor drive shaft
Remove the tail rotor drive shaft from the mechanics, oil it lightly, and slide it through the shaft
bearings in the tail boom, rotating it all the while, until the rear end projects out of the tail boom
far enough to be inserted in the tail rotor coupling. Push the shaft in as far as it will go, then pull
it back again by 1 mm, and temporarily tighten the grubscrews in the coupling to secure it in this
position. When finally assembled, the tail rotor shaft must have about 1 mm axial play in the
front coupling yoke, and that is why you are temporarily setting up 1 mm clearance at the tail
end. Later you will push the shaft into the tail rotor coupling as far as it will go, and the clearance
will appear at the front end. Temporarily insert the tail boom in the tail boom flange 1292.5, at
the same time pushing the tail boom fully onto the bearing holder 4448.14. Secure the tail boom
by tightening the clamping screw in the flange. Slide the tail rotor into the tail boom from the
rear, and rotate the shaft to ensure that the front end engages in the quick-release coupling
which is part of the main gearbox. It should be possible to slide the tail rotor into the tail boom to
the point where it rests against the flange, without the drive shaft fouling the quick-release
coupling at the front. If this is not the case, the tail rotor shaft must be shortened slightly.
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