Bootstrap Framework 3.3.6

Task:

Using the Cockpit SX the well known Co-Axial helicopters shall be controlled. The following changes to assignment of the Rx outputs is necessary:

From X change to Y
Servo 1 ROLL (aileron) -> ROLL (Aileron)
Servo 2 PITCH (?) (elevator) -> PITCH (Elevator) (Whatever the function in a heli is called that controls attitude about the lateral axis)
Servo 3 (YAW (rudder) -> Throttle
Servo 4 THROTTLE -> YAW

The Functions of Servo 3 and 4 thus must be swapped. Which Stick is used to control the function is ajusted as per standard in the Menu SETUP / MODEL / MODE

Solution:

a. Set up a new model using GLIDER as the template

Don't use HELI, as you wouldn't be able to relise trim on YAW.

b. Allocate Rudder (Yaw) to Servo 4 and add trim

Go into the menu MIXER to menu item THROTTLE -> S4 (allocation to Servo 4)

Depress the 3D Digital selector and chose R(?) (Rudder) as control function for Servo 4

Now Rudder (yaw) is allocated to Servo 3 and 4. but there's no trim on Servo 4. You can correct that by mixing the left slider FLAP/ AUX1 with a free mixer into Servo 4.

Go into the Menu MIXER to MIX 1, MIXDEF. Select F (FLAP/AUX1) for the Input and Servo 4 as target. Now adjust throw for this mixer to 30% and -30%. Now this slider trims just like trim on the rudder/yaw stick.

Beware: The position of the left slider can not (like a digital trim) be saved. If you adjust slider F when using another Model, you will have to record the positiôn and readjust it.

c. "Mix away" function ruddeer (yaw) on Servo 3

To take away the rudder input from Servo 3, an influence of same size but different sign is mixed into Servo 3.

Go to menu MIXER to MIX2, MIXDEF. Select R (?) (Rudder) for the input and Servo 3 as target. Now change to the throw adjustments for this mixer. Hold the rudder (yaw) stick to the right side and andust throw to -100%. Now hold the rudder-stick left and adjust 100%.

Adjust trim of the rudder (yaw) stick to center. Any value differing from that would affect throttle

d. Mix throttle into Servo 3
Using the third free mixer mix trhrottle into Servo 3.

Go into the menu MIXIR to MIX3, MIXDEF. Select THROTTLE as input and Servo 3 as target. Then adjust throw for this mixer to 100%. For throttle there is only one value to adjust.

WARNING: Don't test just yet!

If you'd control the model like that you would only be able to control throttle between half and full.

Go to menu SERVO, select servo 3 and then CENTER and adjust center to -100%. Now you can control throttle from Motor off to WOT.

TIP: In our test-helo the throttle stick was too sensitive for hovering. We reduced the servo throw of Servo 3 to 70% for WOT. Like that control of the model was easier when hovering.