brain 2 rescue problem

[paul 5ive-t]

i put a brain 2 on my goblin nitro and when I hit rescue I am getting correct orientation and climb out but also about 45 degree right aileron and no matter what I seem to alter I cant get rid of it, I have a brain 1 on my 700 comp and it works perfect......any clues?

[Nick_C]

Vibes,had the same on my Trex 700n,ended up not using the rescue

[Grumpy]

Vibrations will make the FBL loose track of where level is, which effects nitros more than electric. All you can do is try to isolate the FBL from vibration as best you can.

[Crashalotjoe]

As others have said, it's almost certainly a vibration issue. The Futaba foam tape under the unit is recommended, particularly for nitros.

Personally I don't trust rescue anymore having had a perfectly well flying heli chucked at the ground when testing rescue. It seems the vibes had gradually built up over time and were confusing the sensors. There were no warnings that something was wrong. Of course if I'd checked the logs from time to time I would have spotted the problem but I didn't. All rescues are now disabled.

[Pj1969]

Maybe worth just checking that the unit is on perfectly straight and not tilted to one side or out of line? I use Maplins double sided tape doubled up on all my brains and all seem fine. Only issue I had was tail kept dropping, that was done to the unit being a couple of though out on the back of the heli, quick straighten up and was bang on.

[paul 5ive-t]

thanks for the reply's, I will see what I can sort. ;-)

[Mike Sanders]

Let us know how you get on.

[cjm180]

Hope you get it sorted Paul

[paul 5ive-t]

Will do mike.....and yes i do craig as you have seen what it does....

[cjm180]

I did, and it looked a strange one!

The unit looked perfectly square. And other than this issue your heli flew amazing

[Grumpy]

From what I've read it's quite common with systems with self levelling and/or rescue and higher levels of vibration.
I've only got one heli with rescue, it's electic and doesnt suffer the problem but it's not hard to understand why it happens when you think about how these systems work. They figure out 'which way is up' during initialisation by detecting which way gravity is pulling on the accelerometers. After initialisation they need to keep track of which way is up based on detecting every tiny movement of the heli and working that back to it's starting position. It's pretty amazing that they can do this at all, but then if you add some vibrations into the mix it gets whole lot harder. The software needs to try to filter out the vibrations, but not filter too much out otherwise small 'genuine' movements are missed. There comes a point at some level of vibration where significant errors start to creep in and track of the 'up direction' is lost.