GRAUPNER Skalar, Manual

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elektro
Skalar
34
9. Tail rotor control system
(bag SKR-5)
The tail rotor control system is based on a cantilever carbon fibre pushrod.
Screw a ball-link onto one end of each of the M2.5 x 75 mm threaded rods to a depth of about 7
mm. Slip the pushrod strut onto the CFRP tube, then glue the M2.5 x 75 threaded rods into both
ends using slow-setting epoxy, e.g. UHU-Plus endfest 300, Order No. 950. At the front end the
ball-link on the threaded rod should butt up directly against the CFRP tube. At the rear end the
threaded rod should be positioned as shown in the drawing, i.e. projecting to the point where the
distance between the centres of the two ball-link sockets is exactly 843 mm.
Fit a linkage ball onto an M2 x 8 screw, fit the screw in the outermost linkage hole in the bell-
crank, and secure them with an M2 nut. Be sure to apply thread-lock fluid, Order No. 952, to the
screws and nut.
Attach a linkage ball to the output arm of the tail rotor servo using an M2 cheesehead screw and
nut. Connect the prepared carbon fibre pushrod to the servo at the front and to the tail rotor ac-
tuating arm at the rear. Fix the pushrod strut to the support flange as shown in the drawing using
an M3 x 12 screw and self-locking nut. Take care to position the pushrod strut in such a way that
the pushrod is not under tension, and moves to and fro without exerting any noticeable pressure
on the strut.