GY401 drift problem

[united737pilot]

My 401 has been on 2 heli's and had sveral crashes.

On about the 50th flight in my 500 it started drifting at liftoff. So I trimmed to stop it. When I went into idle-up it began a fast drift in the other direction so I trimmed to stop it. It even requires trimming in the middle of flight because it will start drifting again.

I completely reset the gyro and set it up from step 1 and it still does this. When i stop the drift with trim it flys pretty well locked in (slight 5 deg loss of heading).

Is the gyro fried? One of the crashes recently on the 500 caused a high amp draw that fried my ESC and 1 servo. Is there a chance this damaged the gyro too?

Thanks for any help

[mattkreps]

It is possible after all that abuse it is just worn out. The 401 on my 450 has been through more than a few crashes and has no prob. Ill assume you are using a high speed futaba digital servo. I had the same prob with my jr 770. Get that ball link as close to the output shaft as you can while still getting a good amount of throw. this will allow you to up your gain a bit and should stop the drift

[united737pilot]

thanks for the response. I will give it a shot . If it is toasted would you recommend the jr 770 then?

[Jaso]

I have a quick one for you to check also .
I had a tail drift on liftoff yesterday that came from out of the blue . I landed and did a visual check over with nothing out of the ordinary found . This is with a 401 and 9254 combo .
Anyway went to try again after trimming only to find the tail let go and continued to piro ,a dodgy auto followed by another inspection .

This is where I found that the hole tail servo and brackets mounting it to the boom had moved about 6 mm along the boom towards the tail box away from the main frame . I suspect the reason was due to some silicon spray geting onto the outside of the boom and under the tail servo brackets . They were done up prretty tight too , seemed to be just a case of a warmer day , heli sat in sun for a while , things flexing as they heated and the lube working it's way under the brackets .

Not saying this is you problem but worth checking none the less .

I removed the brackets from the servo mount and boom , cut some strips of 400 wet and dry paper and glued to the inside of the bracket so it had good bite onto the boom tube .
Refitted the brackets and have yet to try it out but I think it's licked .

Anyway just another problem that is new to me anyway and will give weird tail problems for sure .

good luck

Jason.

[mattkreps]

absolutely it holds like a rock ohhhhh like a rock