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SAB Heli Division Goblin 770 Manual

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OPERATIONS BEFORE FLIGHT
*Set up the remote control and the flybarless system with utmost care.
*It is advisable to test the correct settings of the remote and flybarless system without main blades or tail blades fitted.
*Check that all wiring is isolated from the carbon/aluminum parts. It is good practice to protect them at the points where
they are at most risk.
*Be sure of the gear ratio, verifying carefully the motor pulley in use. The forces acting on the mechanics increase
enormously with increasing of rpm. Although the Goblin can fly at high rpm, for safety reasons we suggest to not exceed
2000 rpm.
*Check the correct tension of the tail belt through the belt tensioner.
*Fit the main blades and tail blades. (Fig.1 and Fig.2)
*Please make sure the main blades are tight on the blade grips, you should be able to violently jerk the head in both
directions and the blades should not fold. Failure to tighten the blades properly can result in a boom strike.
To fold the blades for storage, it is advisable to loosen them.
*Check the collective and cyclic pitch. For 3D flight, set about +/- 12°-13°.
*It is important to check the correct tracking of the main blades.
*On the Goblin, in order to correct the tracking, adjust the main link rod as shown in figure 3. This is provided with a right/left
thread system that allows continuous fine adjustments of the length of the control rod; for this adjustment it is not necessary
to detach the ball link.
*Perform the first flight at a low headspeed, 1600 RPM.
After this first flight, do a general check of the helicopter. Verify that all screws are correctly tightened.
A
B
DETAIL A
SCALE 1 : 7
H0158
DETAIL B
SCALE 1 : 3.5
IN FLIGHT
During its first flights the Goblin has to be “run in”.
The Dampener system, the main gear, the uniball and other parts must undergo some slight wear to operate smoothly. It is likely that during
the very first flights the model may exhibit a swaying phenomena, particularly at low head speed.
This phenomena disappears after a few flights.
If you want to fly in a generic way, using both low headspeed and high headspeed, the standard setting is the best compromise.
However, if you prefer flying at low speed [< 18
00
rpm], for best results we recommend changing the tail pulley for a smaller
one to increase tail rotor rpm. In this way, you will have extremely precise tail control even at low RPM. This pulley is available
in the upgrade list [
H0154-S
].
Goblin 770 uses the HPS head.
The dampening system of this head allows for a wide range of head speeds to be used without sacrificing safety.
The dampers are composed of an o-ring and a technopolymer damper that defines the maximum possible movement of the spindle.
The model response with change based on the preload, less preload (less shims) will allow for a softer feel and lower head speed, a high
preload is used for hard 3D flight.
To increase the preload, you can add an additional 0.2mm shim on each side, to decrease the repload, you can remove a 0.2mm shim on each
side. It is important that the blade grips do not have the axial play so you must always keep the 1mm shim on each side regardless.
HC116
HC218
HC074
HC206
Copyright@2012 - SAB Heli Division - All rights reserved
Page 33
Chapter 15, In Flight
… 35 …


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