Colco GY400 AVCS Rate Gyro
Head Lock (shipped from USA)
$49.99(USD) price includes shipping*
*shipped within con. US.

For Sale:
New!! Colco GY400 AVCS Rate Gyro for R/C Helicopters. This is a Head Holding (Head Lock) & Rate Gyro in one package. The Colco GY400 Gyro is shipped in it's own protective case. Instructions are included (see note).

THIS ITEM IS LOCATED IN THE USA. This means faster arrival times without time consuming delays from overseas shipments & Customs holds.

Description:
The GY400 is a high performance, compact, light weight, AVCS (Angular Vector Control System ) gyro with an integrated sensor and control circuit developed for model helicopters.

Specifications:

• Control System: Digital advanced PI (Proportional Integration) control
  
• Gyro Sensor: SMM (Silicon Micro Machine) system vibration gyro
  
• Operating Voltage: +4VDC to +6VDC
  
• Operating Temperature range: -10C to +45C
  
• Dimensions: 21.8 x 21.8 x 19.0mm
• Weight: 11g
  
• Functions: Gyro operation direction switch (DIR), Limit trimmer, Remote gain control, AVCS / Rate (normal) mode switching

Features:
AVCS system
When the helicopter is exposed to a side wind, the tail begins to drift. The gyro controls the servo so that the movement of the tail stops, the same as a conventional gyro. At the same time, a sensor is controlled so that the tail is rotated in the opposite direction (returns to the original position). In short, the conventional gyro performs an operation known as "drifting stop", but the AVCS system performs an operation that "stops drifting and returns to original position". The "return to original position" operation added to the AVCS system improves rudder trim operation. In other words, the gyro can automatically trim the rudder against side winds. This also applies to reverse flight. When a helicopter is flying in the forward and reverse directions, the rudder trim is changed to advance, but with the AVCS system, this trim change is performed automatically and instantaneously so that the tail remains extremely stable even during high-speed reverse flight.

SMM gyro sensor
Use of newly developed extremely low drift SMM (Silicon Micro Machine) gyro sensor virtually eliminates rudder trim changes during flight.

Integrated, compact, and lightweight
Compact size (21.8x21.8x19.0mm) and light weight (11g) realized by high density mounting technology.

Conductive resin case
Conductive resin case improves EMC (electrostatic and electromagnetic interference) resistance.

AVCS Gyro
Conventional gyros send control signals to the rudder servo only when the tail of the helicopter moves. When the tail stops moving, the control signal from the gyro becomes zero. Conversely, the AVCS gyro continues to send control signals to the servo even when the tail of the helicopter stops moving. The following sequentially describes the conventional gyro and the AVCS gyro.

Operation of Conventional (Rate) Gyro
Basic operation is described by considering the case when the helicopter is hovering under cross-wind conditions. With a conventional gyro, when the helicopter encounters a cross-wind, the force of the cross-wind causes the tail of the helicopter to drift. When the tail drifts, the gyro generates a control signal that stops the drift. When the tail stops drifting, the control signal from the gyro becomes zero. If the cross-wind continues to cause the tail to drift in this state, the "stop" operation is repeated until the tail faces downwind. This is called the "weather vane" effect.

Considering operation of an AVCS gyro, when the tail of the helicopter rotates, the servo also rotates in accordance with the angle of rotation of the tail. When the tail stops rotating, the servo judges that it has stopped in that position. This is the auto trim function.

Payment details:

Money order / Cashiers check / PayPal

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Note: The instructions that is supplied with this gyro is not consistent with the actual gyro. The instruction manual that comes with this gyro seems to be a copy of the Futaba GY401 manual. The changes made by Colco to Futaba's manual are minimal, therefore, the supplied manual is not exactly for the GY400, although, it does properly explain the functions and setup of the Colco GY400 gyro. The Colco GY400 gyro does not have all of the features of the Futaba GY401 gyro For those who have purchased this gyro and have asked for the proper manual, here is the proper manual for the GY400: colco_gyro_gy400.pdf