T Rex Support                                                                                                  

    Last updated on: 8-30-09

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How to Get Ball Links Working Smoothly

Smooth control of your helicopter depends critically on how well the ball links fit the balls.  A properly fitted ball link will fall due to it's
own weight when the ball is rotated and will have no slop.  All you need is a smooth jaw pliers.  Simply squeeze each link around it's
perimeter (while on the ball) and check the fit.  Repeat this process until the fit is just right.  This should be done for ALL of the links
on the helicopter.



T Rex CDE CCPM Quick Setup Guide

This guide is intended to serve as an overview for the initial CCPM setup out of the box.  Futaba 9CHP and
7CHP radio terminology is used which is applicable to other radio brands as well.


Before Starting:

  • Disconnect the motor from the ESC or unplug the ESC from the receiver and connect a 4.8 volt a flight pack battery.
  • You will need a good quality pitch gauge.  The Align unit works great.

Throttle stick is in the center position for both photos

STEP 1 - Initial Radio Settings

  • Set the swashplate type to SR3 or equivalent.
  • Set the AVT to 100 % for Aileron, Elevator and Pitch.
  • Set the servo reversing (Hitec servos) to  A= Rev, E = Norm , P = Norm.
  • Set the swashplate AFR to A= 50%, E= 50% and P = 30%.
  • Throttle curve (Normal) 0, 25, 55, 75, 100
  • Pitch curve (Normal) 23, 30, 50, 80, 85
  • Throttle curve (Idle 1) 100, 75, 60, 75, 100
  • Pitch curve (Idle 1) 0, 25, 50, 75, 95

      Note: If you are using Futaba servos, the reversing settings will be opposite.

STEP 2 - Upper Links and Servo Mounting

  • Verify that the links A, B, D and E are the length specified in the users manual.
  • Connect links E to the Swashplate and T arms as shown.
  • Mount your servos as shown above.
  • With the throttle stick centered, adjust the servo arms as shown.  The goal is to get them pointing up/down.
    Use subtrim as needed.

- Arm Links to Servos

  • Connect the A and P servos links to the T arms as shown.  Adjust the length of the links so that the T arms
    are pointing up/down.  Try to get the two T arms in the same position.
  • Connect the E servo to the elevator arm as shown.
  • At this point the swashplate should be sitting level.  Adjust the links from "servo to arm" as needed.  If needed,
    the links E can be adjusted but they both should be kept the same length.

STEP 4- Setting up the blade Pitch (Normal)

  • Set the transmitter throttle stick to the center position.  Mode = Normal.
  • Measure the pitch with a pitch gauge.
  • Adjust the pitch so that it is about zero.  To do this, use a combination of changing links A, changing subtrim and/or
    changing the lengths of "servo to arms" links. Note: Both A links must remain the same length, The subtrim for A, E, P
    servos must change equally and the lengths of "servo to arms" links must change equally.
  • Set the throttle stick to Max.  Measure the pitch.  It should be around 8 degrees.  This can be adjusted with point 5 in
    the Normal pitch curve menu.
  • Set the throttle stick to Min.  Measure the pitch.  It should be around -4 degrees.  This can be adjusted with point 1 in
    the Normal pitch curve menu.
       At this point the helicopter has a basic setup and is flyable in Normal mode.
   The heli should Hover around 55-65% throttle and have a head speed of 2200 to 2400.
       To increase head speed, decrease the pitch and/or increase throttle and visa versa.

       This assumes you are using an Align 430LF (3550 KV) motor with an 11T pinion or similar.


STEP 5- Setting up Idle 1 Mode

  • Set the transmitter throttle stick to the min position.  Mode =Idle 1.
  • Measure the pitch.  It should be around -10 degrees.  Adjust the P parameter in the swashplate AFR menu.
  • Move the transmitter throttle stick to the max position or until the swashplate hits the washout base. Adjust
    point 5 in the Idle 1 pitch curve menu so that at full stick you get about +10 degrees of pitch and the swashplate
    is not binding on the washout base.

Other Settings

  • Idle 2 is setup very similar to Idle 1 except point 3 in the throttle curve is set much higher.  Experiment to see what
    you like the best for your flying style.
  • Negative expo (-30 to -50) on the elevator and aileron channels will make the heli feel much less twitchy.
  • Negative expo (-10 to -20) on the rudder channel can help smooth out the feel as well.









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