Thread: BeastX Knife Edge piro Problem

A strange phenomena on 2 identical Fusion 50 helis. We are both trying a knife edge piro move where with the heli if ff in to wind we roll 90 degrees and then apply left rudder, after 360dgs we roll back upright and carry on in ff. Both models are using the AR7200Bx and both have DS610's on cyclic and 620's on the rudder. One uses a Kontronic Hv ESC and one a CC 80Hv with a governed headspeed of 2100. Both roll perfectly but when rudder is input there is a pause of around 1 to 2 seconds before tail movement starts, and this movement is then extremely fast and it whips round sort of uncontrolled.

Again a Fusion with V Bar does not exhibit this behaviour although it is using a ds650, anyone any ideas.

Thats strange Dave, my 550 is on a beast with a cc80hv and it does them perfectly i know thats not much help but i will have a word with Jack and see if his fusion/beast has the same thing going on.

I would suspect the tail servo giving out more than I would the beastx.

Originally Posted by Jamin_00

I would suspect the tail servo giving out more than I would the beastx.

I'd go with you on that Ben if it weren't 2 identical machines. The other one was fixed if you like by lowering the tail dynamic which has foobarred the stops. Mine is brand new and hasn't even had the pot touched as yet because I think the stops are okay for me.

Ive had the exact same thing but with 3gx (runs for cover).althought not the same trick,it only does it in one pyro direction...

BeastX is well known for whippy tail issues which are still apparent on v3. I think it happens mostly when a lot of rudder pitch is required, at least, that's my experience of it on a 450.

Sound like the combo of fast airspeed and sudden yaw demand is a bit much for the tail servo,maybe try a different servo or come in a hole on the horn and reset the unit accordingly

Originally Posted by 3dbasher

Sound like the combo of fast airspeed and sudden yaw demand is a bit much for the tail servo,maybe try a different servo or come in a hole on the horn and reset the unit accordingly

I agree completely, Lees right. Try a diffrent tail servo id be very surprised if it does the same. How far are you out on the servo wheel BTW?

Id say it was the 620 but might be worth coming in a hole on the horn to lower the mechanical gain first. you should be able to up your tx gain a bit then.

WaveyDavey I think it could be something to do with the tail dynamic pot 3, try increasing it as i think when its set too low it does give a slight dely in tail piro (from when you have put the rudder input in and there is a slight delay before the bx starts the piro). And as for the whipping effect try increasing the 'Tail headinglock gain' para menu point 'D' as this has cured my whipping on my 450pro.

I can now do piro loops into wind with my 450 pro and the tail doesnt whipp or have any delay.

Try adjusting those settings and see what happens.

P.s the DS620 might be exadurating you problems as my 600le has a very whippy tail (prob due to the fact it isnt the fastest) try a savox or mks tail servo should be of benefit

Dave, I have a new ds650, I can send it down to you if you want to try it?

Eric

If it's the servo why would a 650 and a V Bar be okay. It's not a whippy tail, there is a delay in starting the piro and then an acceleration outside of what is normal on the Beast. I've used the Beast on my 600 for 18 months or so without a problem really apart from the odd tail wag but never what I had today. The 620 isn't a slug by any standards with 60 degrees in 0.07s and the 650 in 0.05 but with a lot less torque, so I would have thought into the wind the 620 would have been better

Originally Posted by Flat Eric

Dave, I have a new ds650, I can send it down to you if you want to try it?

Eric

Thanks Eric, a nice offer. If I thought it was the servo I would happily go and buy a new one. I don;t think it is somehow. Another identical machine shows the same issue

Originally Posted by Made2Fade

I agree completely, Lees right. Try a diffrent tail servo id be very surprised if it does the same. How far are you out on the servo wheel BTW?

It's around 10mm Lee

Originally Posted by waveydavey

It's around 10mm Lee

Im running a standard beast in my velocity 50 on the latest software 3.08 is it?
ive not got the tail stops sorted yet but only had 3 flights on it in as an fbl machine, i did some big piro loops and stuff no probs, but ill try a fast knife edge piro next time im out and let you know what happens, Im using a futaba 9256 with 10.5mm arm on tail,nhp 95mm blades,2050rpm @ the head, think TX gain is at 60% but its all still new ish to me got a little more tweeking to do.
Cheers
Lee