BeastX Tail kick

[Gate88]

So over the past couple of weeks I have been ramping up the settings on the BxV3 on my Trex600 and it seems that when I up the Parameter Menu "B" "Control Behaviour" pro or extreme I get a sudden tail kick when I flip from normal to inverted flight, thats usually followed by a couple of lesser wiggles if I go straight into inverted FF. It also happens if the "Cyclic Response" "G" is anything above "increased".

I know the obvious answer is to keep below the higher end of the parameter table but when I do that it just feels too slow and sloppy when I flip and roll.

At first I thought it was a mechanical thing, we've played with the COG and I've swapped loads of parts on the tail, tried to stiffen up the boom, braces & back part of the frame but no luck. Everything is perfect now there's no excess backlash, missing teeth on the gears, binding or slop in the tail linkage. The only part of the tail assy that I havent swapped out is the torque tube but I have had it out and it looks pretty straight.

So it kind of just leaves the Bx itself, I havent tried experimenting with thicker pads yet (I'll probably do that over the W/E), and I havent had a go at adjusting the pots cause I'm not sure which does what, but other than that I'd like suggestions from you guys as to possible things that I could try.

[NEAGRON]

Do you have the pre comp going the correct way,yours Marty.

[Gate88]

Do you have the pre comp going the correct way,yours Marty.

It's red flashing = low/norm. Does that sound right?

[waveydavey]

It's red flashing = low/norm. Does that sound right?

I'll have a look at mine when I get home, easiest way is to add collective with the tail blade bent up 90 degrees. If it's the right way the tail blade should move to the right a bit, IE adding a bit of nose right.

I personally wouldn't sit it on thicker pads, In my experience it just adds other issues in to the mix. Which way does the tail kick Guy, what tail blades are you using, what headspeed are you running.

[Gate88]

Which way does the tail kick Guy, what tail blades are you using, what headspeed are you running.

Ok imagine you're looking at the heli the right way up and tail in, if I then pull back on the elevator as the nose goes over and it reaches full inverted I see the tail pop out to the left of the canopy. So in other words if you are looking down on the skids of it inverted its kicking anti clockwise.
Tail Blades are 95mm carbons, but I have tried Align carbons, and some Radixs.
Headspeed = S1/ 2150 S2/ 2200

[stillakid]

Most problems seem to stem from the mounting tape. I use a single layer of 4010 tape on the standard gyro platform & made sure the wires are supported so they don't affect the Beast during flight. No tail issues on my 600N.
Also most use transmitter mode & dial in the feel they want. A good starting point is 80% D/Rs & 20-25% expo. This is fairly tame & gave me no surprises.

[Gate88]

Most problems seem to stem from the mounting tape. I use a single layer of 4010 tape on the standard gyro platform & made sure the wires are supported so they don't affect the Beast during flight. No tail issues on my 600N.
Also most use transmitter mode & dial in the feel they want. A good starting point is 80% D/Rs & 20-25% expo. This is fairly tame & gave me no surprises.

I have a fairly thin pad under it at the moment and the wiring is well supported. I figure that if it was a mounting issue it would happen when I flip inverted to nomal and it doesnt, its only normal to inverted.

[waveydavey]

Sounds odd as that's against the torque reaction. Have you checked whether the torque pre-compensation is working the right way. I don't think it's down to mounting as flipping it you would expect elevator bounce if it was loose tape. Guy, your not putting a bit of rudder in as you catch it on the invert are you. Just it's against all the normal counter rotation/ torque reaction/tail authority directions.

[Gate88]

Sounds odd as that's against the torque reaction. Have you checked whether the torque pre-compensation is working the right way. I don't think it's down to mounting as flipping it you would expect elevator bounce if it was loose tape. Guy, your not putting a bit of rudder in as you catch it on the invert are you. Just it's against all the normal counter rotation/ torque reaction/tail authority directions.

I dont think its my dodgy fingers, other people have flown it and it happens to them as well. The other thing that makes me doubt that is that it doesnt happen on my V50.
When you say Torque precompensation are you talking about the Pirouette Optimization direction? If so then the swash plate tips backwards as you enter the letter"N".

[squeaky pete]

silly question, have you set up the tail in rate mode yet?? could just be geomerty, could be ever so slightly off

[waveydavey]

I dont think its my dodgy fingers, other people have flown it and it happens to them as well. The other thing that makes me doubt that is that it doesnt happen on my V50.
When you say Torque precompensation are you talking about the Pirouette Optimization direction? If so then the swash plate tips backwards as you enter the letter"N".

No in the Beast parameter menu you have setting F (Revomix in old money)



This adds rudder automatically on collective, in order to counteract the natural torque reaction of nose left.

[Gate88]

silly question, have you set up the tail in rate mode yet?? could just be geomerty, could be ever so slightly off

Yes I think so, well we did it by setting a low gyro gain rate.

[SaneAdam]

Are you using 3.0.8? Mine was doing the same, but stopped once i updated .8

[Gate88]

No in the Beast parameter menu you have setting F (Revomix in old money)

[ATTACH=CONFIG]33849[/ATTACH]

This adds rudder automatically on collective, in order to counteract the natural torque reaction of nose left.

Yes thats re flashing = low/norm, is that what your 600 is Dave?
When I pump in pitch it pushes the trailing edge of the tail blades right (nose right) but only by a minute amount, I'd say going from bottom to top less than half a degree on the tail blades.

[Made2Fade]

silly question, have you set up the tail in rate mode yet?? could just be geomerty, could be ever so slightly off

If you havent done what Petes saying id highly recommend it. The beast holds far better when you setup normal rate.