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  Item found in the following categories;
> Helicopters & Parts > Gyro & Stabilization > Tail Gyro


Hobby King 401B AVCS Digital Head Lock Gyro

Hobby King 401B AVCS Digital Head Lock Gyro

The now famous HK401B is known to have the same characteristics as the Futaba GY401. In fact we guarantee you wont know the difference!
No tail drift, excellent hold characteristics and a level of reliability only found in $100+ gyros.
Dont risk your heli with other cheap Gyros when the HK401B has been proven by thousands of pilots to be stable and accurate in a variety of temperatures and helicopters.
Compatible with both Digital and Analog systems
Minimizes rudder trim changes caused by wind, other meteorological changes, and varieties of helicopter attitude changes are automatically cancelled.
Sensor vibration proofing
Simple sensitivity adjustment
Digital proportional RIC system
Operating voltage: 4.8V ~6V( common for receiver)
Operating temperature: -lOL r-.rf-45 C
Dimensions: 28x26x20 mm
Operating current: 80mA

IMPORTANT: Make sure you isolate your Gyro from vibration. Use double sided foam tape and never use cable ties. Vibration will cause harm to the Gyro and degrade performance.
Manual found in the files section below.


Shipped from:
International Warehouse



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The standard price is: $11.99.
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 Customer rated
Total of 565 discussions.
Breno  11 points - 8/3/2016
Can I connect this gyro in a receiver that will feed directly with a 6.6V LiFe 2s?
 Nivek11 4 points
I't probably possible, but it's for sure a risk because it's not made for it. You could burn it up if you are unluckey
Lee  10 points - 7/24/2016
On this gyro the one I got has some sort of yellowish plastic covering the switches. Does anyone know if that should be removed of should I just move the switches thru the plastic? What is the default position of the two switches as it comes from HK? Thanks for any help!!
Mitko  85 points - 7/19/2016
good gyro, the price of which is less severe but is doing a wonderful job !!! I have it on a heli 450 class.
 Nivek11 4 points
I agree
voo2doo  44 points - 1/9/2016
These are great to use in RC Car steering to compensate drift.easy installation.
 Diederik Harkema 29 points
Yes they are
 ripcurl777 509 points
use them in all of my cars. smooth and nice, and you dont need to connect the 3rd channel (gyro Sens.) cause it is perfect on default settings. Gyro sens. Only needed for drift car.
Jeongrim  2 points - 12/24/2015
The 7.2v is not available?
 David 58 points
Why would you use 7.2V for servo?
 Jeongrim 2 points
yes! servo is 7.2V.
Customer Reviews
Review Blogs for this item
gyro used for Esky HB King 3
Fly less, spend more.
Overall Rating
143 thumbs up!
Ensure you do the fix for this gyro. This is a pretty decent gyro at this price... HK Rocks.

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Overall Rating
68 thumbs up!
IMPORTANT 2-minute fix for this gyro: ("" slash "hk401fix")

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Overall Rating
17 thumbs up!
The gyro is amazing. I used it in the road car model to manage and everything is in perfect order. I recommend this product for its sensitivity and price.

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Overall Rating

13 thumbs up!
i figured for the price i couldnt resist trying one of these and i am not dissapointed this things works great just as good as my 401 futaba gyro you need to look at the mods section on this as i had to do that but the little time i spent doing the mod was more then made up for with the low price and great performance

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Overall Rating
12 thumbs up!
I bought this gyro to try out for HK 450 it does very well ,hold the tail is solid with JR servo DS290G, First I received, inside board was sloppy & I try on heli it doesn't work, then I Open in back gyro I sim double tape to hold them inplace worked very well fly good,good for $ too

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