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HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › Questions about servo connections to the R921 receiver
11-11-2012 08:59 PM  7 years ago
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totally_awesome

rrApprentice

Fredericksburg, Virginia

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Questions about servo connections to the R921 receiver
Hello,

I have been using the HeliFreak videos to gain a understanding over how to hook up the 3 servos in the frame of the TREX 500 to the R921.
I have reviewed chapter 8 in the video series and I am still confused.

1.) The servo on the right side in the rear is the elevator. This plugs into the elevator channel of the R921. This makes the swash plate tilt
front to back.

2.) According to the videos, the servo in the left front is the pitch servo. So I connected this to the AUX1 channel of the R921

3.) The right front servo is the aileron. So I hooked this up to the AILE channel of the R921.

So when I turned everything on, the right stick should control the ailerons, but is acts as if the pitch is being controlled. The left stick behaves as if the Ailerons are being controlled. So I obviously have something hosed up. It is either the servo definitions, how they are connected to the R921, or the X9303 settings. With my luck is is probably all 3.

So could someone please get me started with the correct connections for the servo to the R921? Here is what I got from the video

Left front servo (Pitch) (connect to AUX1)
Right front servo (Aileron) (connect to AILE)
Right rear servo (Elevator) (connect to ELEV)

Once I have the servos connected correctly to the R921 then I can work on the settings for the X9303 radio.
Regards, Dave
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11-11-2012 10:11 PM  7 years ago
totally_awesome

rrApprentice

Fredericksburg, Virginia

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Hello,

I had the arms of the servo in the wrong position. I did not have the left stick in the middle (50 in 50 out), when I put the arms on the servos at 90 degrees. Now the swash plate moves correctly. However when the left stick is all the way forward (max pitch) the servos start squealing because the have reached the end of travel. Is there some adjustment that I need to do to stop this?
Regards, Dave
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11-11-2012 11:07 PM  7 years ago
dkshema

rrMaster

Cedar Rapids, IA

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Dave --- Try reading and following this post:

https://rc.runryder.com/p4325158/
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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11-11-2012 11:08 PM  7 years ago
dkshema

rrMaster

Cedar Rapids, IA

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I'm available to help you get through your first build and setup.-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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11-12-2012 11:26 PM  7 years ago
totally_awesome

rrApprentice

Fredericksburg, Virginia

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thanks.......find something you like at Hobby King.I will get it for you!Regards, Dave
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11-13-2012 01:37 AM  7 years ago
MCcrash

rrNovice

Fernie BC canada

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Radios
[size=large]I have a RD 6000 radio system I would like to use with a GT5 gyro system will they work together and how do I plug them together
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11-15-2012 11:34 PM  7 years ago
totally_awesome

rrApprentice

Fredericksburg, Virginia

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Hello,

Another question about connections to the R921 receiver. During all of the adjustments for the copter I am powering the R921 with a receiver battery. So how does the receiver get power during flight mode? Does the R921 get powered from the flight battery thru the connector from the ESC for the throttle control?
Regards, Dave
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11-16-2012 06:27 AM  7 years ago
dkshema

rrMaster

Cedar Rapids, IA

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Dave,

Your system will be powered by the built-in BEC that is present in your speed control. The Battery Eliminator Circuit (voltage regulator) receives its input power from your main 6S LiPo that also powers the motor. The BEC will output a nominal 5 volts (you can program it for higher output if you need to), and power is supplied to your radio and servos over the three-wire harness that has the small toroid wound on it, and which plugs into the throttle channel of your receiver.

Power and ground from the BEC are supplied to the radio system over through this cable as well as the throttle signal from the RX back to the speed control.

Your receive doesn't really know which port has the power applied, as the power pin (middle contact of the plug, red wire) and the ground signal (black/brown wire) are bussed to all connector pins on the RX connector block.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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