Vis50 BeastX maidened - violent shakes in FFF?

[Planehazza]

Hey all,

(Re)Maidened my BeastX FBL Vision 50 today. Hovering was smooth with a slight wag on the tail, HH gain obv still needs to be tweaked. The main problem I got was druing fast flight, mainly forwards, where the heli would violently shake. I couldn't tell if it was on all axis, but it predominantly looked like it was on the rudder.

Can someone please explain the difference between regular heading hold gain (via Tx EPA) and the Tail heading lock gain (parameter D) feature? I had mine on Medium (default) with 45% gain heading hold in the Tx. Wagged violently in FF with only a mild wag in a hover, so I dropped the Tx gain to 42% and dropped the Tail heading lock gain (D) to low, and the problem still occurred.

It was so violent at one point, Lee thought I'd lost control of the model! haha

Does anyone have any ideas?

Thanks!

[Tim Procter]

Hi Harry.

First of all make sure you have zero vibrations going through the BeastX.

Mounting it too close to the electrics will cause a disturbance with the unit.

If needed mount it on the back (tail boom mount) out of the way, Mine is mounted on the rear and much better.

Too much gain will cause the heli to "Shudder" as you explained in fast forward flight.

Several factors can cause these problems but they can be easily sorted out with a little tweaking and testing..

Also worn dampers will cause vibes.

[Planehazza]

Hi Harry.

First of all make sure you have zero vibrations going through the BeastX.

Mounting it too close to the electrics will cause a disturbance with the unit.

If needed mount it on the back (tail boom mount) out of the way, Mine is mounted on the rear and much better.

Too much gain will cause the heli to "Shudder" as you explained in fast forward flight.

Several factors can cause these problems but they can be easily sorted out with a little tweaking and testing..

Also worn dampers will cause vibes.

Cheers Tim.

It isn't mounted too close to other electronics, but it is on the front gyro mount and the cable are quite tight so any vibes will be going there. I need to slacken them off.

I doubt the dampeners are worn as they are pretty much solid plastic and still very tight.

Do you have a velcro strap around yours to secure it, or do you jsut rely on the sticky foam pad?

[Tim Procter]

To be honest Harry I binned the supplied pads and use 1mm double sided tape which works perfect with no velcro mate.

[pgkevet]

My beastx 600N was fine for several weeks and then I noticed a subtle porpoising in fff..tweaked the first gain pot with no change.

Checking over heli I found one of the lower boom support threads stripped which had lead to slackening off both boom supports a little.. porpoising gone.

(in other words looks for the source of any vibe before all else)

[Planehazza]

Other than vibes, interferance and location, are there any settings etc I can check? The only one I think could affect this is the parameter D, but I had the problem regardless of its setting

[Dave Rand]

I found with mine the best way to set the tail up is. Turn down the Tx gain until you get no shuddering in funnels/fast backwards stuff.
This gave quite a soft tail then up'd pot 3 to give nice firm stops.
I then up'd tail heading lock gain (D) to high(blue flashing)
As said above make sure vibs are minimal, also make sure there is some play in the wires from the beast.
And set up tail in rate/normal mode.

My tail is better than the quark. Happy days

Beast x rocks

[Planehazza]

Thanks all. Got rid of the foam pad and used a 1mm spartan pad, and fastened it down with a velcro strap. Also rerouted the cables so there is plenty of slack in them.

Should fly tomorrow weather dependant, so will let you all know

[oneandonlyian]

Might sound daft and you may have already thought of it but make sure the strap cant depress the button on beast x. I had the shaking issue a while back and the wiring was the cause a small shake or vibe on the wiring is magnified into the unit. Securing the wiring but leaving a small amount of free play close to unit sorted everything.

Hope this helps