SAB Heli Division Goblin 570 User Manual - page 28
Maintenance
*On the Goblin 570, some areas to look for wear include:
- Motor belt
- Tail belt
- Dampers
- Main gear and pinion
*The lifespan of these components varies according to the type of flying. On average it is recommended to check these
parts every 100 flights. In some instances, based on wear, these parts should be replaced every 200 flights.
*The most stressed bearings are definitely those on the tail shaft. Check them frequently. All other parts are not particularly
subject to wear.
*Periodically lubricate the tail slide movement and its linkages as well as the swash plate movement and its linkages.
*Lubricate the main gear with Dry-Fluid or Tri-Flow Synthetic grease, even though the gear is made of technopolymer,a high
mineral based filler, it still requires some lubrication.
*To ensure safety you should do a general inspection of the helicopter after each flight. You should check:
- Proper belt tension (motor belt and tail belt).
- Proper isolation of the wires from the carbon and aluminum parts.
- All screws remain tight.
After a crash, please inspect the carbon servo mounts H0308 to make sure they are not cracked or weakened.
Failure to check and detect a possible crack could result in a future crash if a carbon servo mount breaks in flight.
In Flight
The Goblin 570 has been tested at head speeds as low as 1800 rpm and as high as 3000 rpm. However, due to the nature of the head
and dampening system, the model could exhibit swaying phenomena at some lower head speeds between 1800 rpm and 2400 rpm.
This phenomena is noticeable in the elevator axis and can present itself at different head speed ranges based on the types of blades
used, flybarless system gains, etc., usually this goes away by increasing or decreasing the head speed in order to move away from the
harmonic’s rpm.
For 3D flight, it is recommended a head speed of 2400 rpm or higher, at these higher head speeds, the phenomena is non-existent as
the machine is then outside this harmonic range.
The Goblin 570 uses the HPS head (High Precision System)
The dampening system of this head allows for a wide range of head speeds to be used without sacrificing safety.
The dampening preload is set for optimal flying characteristics at a wide range of rpms, it is recommended not to change the preload
by adding or removing shims.
Operations Before Flight
*Set up the transmitter and the flybarless system with utmost care.
*It is advisable to test and verify all the settings on the transmitter and flybarless system without the main or tail blades on initially.
*Check that all wiring is isolated from the carbon/aluminum parts. It is good practice to protect them in the areas 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
increased rpm. Although the Goblin can fly at high rpm, for safety reasons we suggest to not exceed
2600
rpm on the Goblin 570.
*Check the correct tension of the tail belt, use common sense; the belt should be tight enough, but not too tight.
*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.
*Check the collective and cyclic pitch range. For
3D
flight, set about +/- 12°-13°.
*It is important to check the correct tracking of the main blades.
*On the Goblin 570, in order to correct the tracking, adjust the main link rod as shown in Figure 3. The threads are opposite, one side
clock-wise and the other side counter clock-wise, this system allows for continuous fine adjustments of the length of the control rod;
it is not necessary to detach any of the ball links.
*The tail of the Goblin 570 is quite unique in the sense that the tail hub is dampened like the main rotor head. It is normal for the tail
slider to be a bit tight in the very beginning as the tail spindle preload is usually a bit high when the helicopter is brand new. The
preload will loosen up after a few flights once the o-rings start to wear, it is completely normal for the tail blade grips to have what
appears to be “lose dampening” over time.
*Perform the first flight at a lower head speed than normal, for example
2200
rpm. After this first flight, do a general
check of the helicopter. Verify that all screws and bolts are correctly tightened.
HC111
H0265
HC212
HC206
HC074
*Lubricate the main gear with Dry-Fluid or Tri-Flow Synthetic grease, even though the gear is made of technopolymer,
a high mineral based filler, it still requires some lubrication.
Copyright @ 2014 - SAB Heli Division - All rights reserved
Page 26
Chapter 16, In Flight / Maintenance