T-Rex 250 Helicopter Review | The Leading R/C Helicopter Manufacturer

The Align GP750 Head Lock Gyro Review And Setup

The Align GP750 Head Lock Gyro is a very versatile little gyro that can be used on the T-Rex 250, T-Rex 450, T-rex 500, T-Rex 600 and T-Rex 700 helicopter. This little gyro is a 3D Head Lock Gyro that will handle any 3D maneuvers with ease if setup correctly. Gyro locking and gain can be adjusted remotely from the transmitter. Have a look at this video and you will see how the GP750 handle the 3D maneuvers flown by Mickey.

I found the GP750 Gyro setup for the T-Rex 250 straightforward. Make sure that the Align DS420 Digital rudder servo is connected correctly to the gyro. The main gyro lead gets plugged into the rudder channel on the receiver and the gain lead into Aux. 2. Red and green lights on the GP750 Gyro will show you in which mode the Gyro is, and will help you with the programming of the gyro when setup for the T-Rex 250.

Left or right rudder inputs on the transmitter will change the LED status on the gyro between red and green. The set button on the GP750 Gyro is used to start the programming and to toggle between the different settings. Use the following steps to do the GP750 Gyro setup for the T-Rex 250.

Click below on image to watch video

T-Rex 250 setting instructions on the Align GP750 Head Lock Gyro

Green: 1520µs standard band

Green: Digital Servo

Green: Normal rotation
Red: Reverse rotation

The GP750 is set to 1520µs at the factory.
Use the rudder stick on your transmitter to
Select, and set it to green STATUS LED.

When using Align DS series digital servos,
please set it to green STATUS LED.

Move the heli and observe if the direction
of the tail rotor compensation is correct. If
not, please modify the NOR/REV Settings.

The STATUS LED color does not
indicate any setting here.

Red: Suitable for T-Rex 250/450 or
other small helicopters

Move the rudder stick on your transmitter
left until the tail pitch slider reaches the end.
Repeat on the right until the tail pitch slider
reaches the other end. Then press the
"SET" button.

When paired with a T-Rex 250/450, please remember to set the STATUS LED to red. If you want to set delay at the same time, please move the transmitter rudder stick to the direction where STATUS LED is red. With the DELAY STATUS LED flashing, the delay amount is adjusted by stick position from the center: percentage is 0% at middle stick position, and 100% at the end position.

Move the transmitter rudder stick to
the needed delay percentage and press
the "SET" button

Instruction:

Specification:

●Utilizes Silicon Micro Machines (SMM) sensor with excellent stability to dramatically reduce in-flight tail drifts.
●Utilizes AHTCS (Active Helicopter Tail Control System) to compensate any drift caused by wind direction and force ,as well as unintended yaw induced by helicopter itself during flight maneuvers.
●Tailor made specifically for use with high speed digital rudder servos. This gyro features high sensitivity and minimal reaction time, fully utilizing the potential of modern high speed digital rudder servos.
●Features 1520μs pulse wide and 760μs narrow pulse wide frame rate.
●Digital/Analog servo switchable.
●Reverse switch.
●Rudder servo travel limit adjustment (ATV).
●Delay adjustment.
●Gyro locking mode and gain can be adjusted remotely from the transmitter.

＊
1.Mini/Micro heli mode, suitable for T-REX250/450(“STATUS” Red); Medium/large heli mode, suitable for T-REX500/600/700(“STATUS" Green)
2.There are 3 kinds of 760μs narrow pulse wide servos on the market, including Futaba S9251, S9256, BLS251.

●Operating Voltage: DC 4.5~7V
●Current Consumption:<80mA @ 4.8V
●Angular Detection Speed:500 degrees/sec
●Operating Humidity:0℃~65℃
●RoHS certification.
●Operating Humidity:0%~95%
●Size:26x25x11mm
●Weight:14g