Tail overshoot after abrupt Pirouette stops.

[Gunnergolly]

I have three Spartans now fitted to my Vibe 90 FBL conversion, Trex 600EFL and my Trex 550E,

I really like the feel of the units but only problem i have with them is tail overshoot/bounce when i stop suddenly from a fast pirouette (more noticeable in the CCW direction) .... this is on all three models BTW.

The position of the ball joints on my servo horns allow me to achieve the required 200-250 points on the Tail end points during setup.

Admittingly some of that overshoot might be caused by Tx sticks "twanging" when their centering as my stick tension is set pretty high after i let go of them...... i might try adjusting them and soften them up a bit.

I guess it's time to open up the advance menu in the datapod and have a play around with the Acceleration, Deceleration and CW/CWW Stop gains within the Tail adjust menu.

Just need some advice on the best way to find the "sweet spot", should i adjust the Deceleration value to the minimum value so that the tail is really soggy and then slowly increase it until hopefully i see some kind of improvement. Then should i adjust the CW/CWW Stop gain to sharpen the stop up ?.

Just need some advice so that i have plan of attack the next time i'm down at the field and i'll try and get some better sharper pirouette stops.

Thanks...

[forza]

I have found that the default values in the Vortex result in a very hard tail stop in comparison to the other FBL units (and even tail gyros back in the good old flybarred days). As such I have found that with a faster servo (only tested this on a DS650) you may need to adjust nothing from default or maybe just the stop gain(s) provided that your main tail gain is set correctly.

On a slower servo, such a my DS620, I had to also decrease the default deceleration speed from 3500 degrees to 2900 and increase the stop gains both sides by 5%-10% to end up with a sharp stop with no bounce or wag. There's a little trial and error involved but when setting up the Logo I had a good idea where my tail settings needed to be as again I was using a DS620. I had the tail resolved this time without any fuss.

Also to note both my Vortex models have a main tail gain of 26% which threw me a bit when trying to sort the tail as I felt 30% was low enough and in flight I had been up to 45% gain without any symptoms of having high gain.

With all FBL units there is a learning curve and for me the cyclics were very quick to get how I wanted, the nitro gov was awesome from default but my inexperience with the Vortex meant it took me a while to realise how best to tune the tail stops.

Hope this helps

[forza]

There's always a little vbar ninja working his way into the Vortex threads LOL PMSL. Where's your post gone Don?!

[GIXERMAN]

I'm sure Angelo's will come along to assist if your struggling he's pretty good with support.

[milly0812]

Ninja mod

[jimmyhorns]

I dont think you can really test the stop just by letting go of the stick, as you say, you are going to get reverberation of the stick and therefore control input before it settles.

I would be testing it by moving the stick back intentionally to neutral, rather than letting it flick about. It may be why you are seeing it in all 3 models.

[Angelos]

I would help a lot to set the linkages so the heli can fly in rate more, or you can achieve the same thing using the trim flight function. Keep in mind that if you adjust the rod length you should go back to the setup menu and reset the tail endpoints.

The acceleration does not affect the stops; only the deceleration does. The default works well but if you don't mind a bit softer response you can go a bit lower.

After that the only adjustment you can use are the stop gains and it should allow you to make both side stop good and symmetrical to each other.

-Angelos

[Gunnergolly]

Ok thanks for the information.

I've had the back of my Tx and softened up the spring setting on my sticks.... especially the rudder, it's a little less aggressive now when it's centering.

The fact that it's happening in all three models means that the Tx is having something to do with it.

I'll stop "twanging" the rudder stick and try and be a bit my disciplined with it .

I'll switch back into Rate mode in all flight mode 2, adjust the tail linkages so that it holds itself and then experiment with the deceleration and Stop gains from there.

Thanks again..