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Freestyler 3 & 4 
 

5 December 2012 

 

  page 1/5 

 

Linear Drive System (LDS) installation tips 

 

System overview 

 

 

Fig. 1: LDS parts with example MKS DS6125mini servo (rear mounting clip removed). 

 

Short version 

For those who don’t want to read the manual, at first the two most important Don’t Forgets: 

 

Secure the bearing screws with Loctite or 5-min epoxy (after a dry-fit test)! Otherwise they could 

get loose and the bearing falls off. 

 

Remove a piece of the white epoxy gap seal lip, to simplify inserting the pin into the flap horns. 

 

Detailed description 

 
Set contents (per servo): 
Item  Number  Part designation 

/ Teil-Bezeichnung

 

Comment 

/ Kommentar

 

excenter drive with servo spline 

/ Exzenter mit Servo-

Vielzahn

 

 

recessed excenter 

/ ausgefräster Exzenter

 

 

pushrod 

/ Schubstange

  

aileron resp. flap 

/ QR bzw. 

WK

 

pins 

/ Pins 1.5 x 12 mm

 

Third pin in excenter can be 
omitted, gaining reserve pins 

sink head screw 

/ Senkkopf-Schraube

 M3 x 16 

(Graupner/JR, Futaba, Sanwa) resp. M2.5 x 16 (MKS, 
Graupner DES) 

 

5  6 

12 

Summary of Contents for DS6125mini

Page 1: ... bearing falls off Remove a piece of the white epoxy gap seal lip to simplify inserting the pin into the flap horns Detailed description Set contents per servo Item Number Part designation Teil Bezeichnung Comment Kommentar 1 1 excenter drive with servo spline Exzenter mit Servo Vielzahn 2 1 recessed excenter ausgefräster Exzenter 3 1 pushrod Schubstange aileron resp flap QR bzw WK 4 4 pins Pins 1...

Page 2: ...n to left and right servos Using two pins in the excenters is sufficient but to be on the safe side also three pins can be used Fig 2 Excenters and pushrods mounted Pay attention to left and right Excenter mounting Offsets On the ailerons no mechanical offset of the excenter and no electronic offset of the servo are applied Set the aileron servo position to 0 in the transmitter before mounting the...

Page 3: ...ere is doubt that this would overstress the thin wall of the recessed excenters dismount the upper excenter again and use the flat head screw 13 to create more pressure Finally tighten the sink head screws as much as possible but without clamping the recessed excenter so much that it touches the pushrod side face and causes friction When having checked that everything fits secure the sink head scr...

Page 4: ...eßend das Loch in der Dichtlippe noch mit Tape schließen wenn Schubstange an Fläche reibt mit Schleifpapier Abhilfe schaffen sonst kann das Tape Falten werfen Installation in empty wings Additional steps for installation into wings not yet prepared with flap horns and bearing support ribs from factory do it yourself installation to follow later General hints tricks It is easier to replace the push...

Page 5: ...fully mounted in flap horn Fig 6 Servo covers should be thinned locally in case of using thicker servos Alternative mounting method with masking tape shown here Fig 7 Left Servo mounting pads for Graupner DS3288 split such that top part can be removed for servo disassembly Right Mounting pads for MKS DS6125 Grind thin ...

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