BeastX Not Good on X5

[G-Bru]

I fitted a BeastX unit to my Gaui X5 on Friday. Was extremely excited to get the bird off the ground Saturday at the Club, but was soon to be disappointed!

Spooled the X5 up got into a hover and noticed a slight aileron wobble through the skids!
I spent the rest of the Saturday afternoon and the whole of Sunday trying to source the cause of this wobble but failed.

I tried various types of double sided tape combinations, thin hard, soft, Align PU Gel, metal plate, strapped and unstrapped, all produced the same result.
On the bench with the blades off, the heli is smooth as silk, however, if i place my finger lightly on the airframe at certain locations I can feel a high frequency vibe/resonance in the carbon. Not certain if this is my problem?

On the Freaks forum, other X5 owners have confirmed the same wobble using the Beast, naturally I am pretty damn deflated and P****d Off! I have posted a message on the Beast forums and not a single Beast representative has made a suggestion to the possible cause of this wobble.

A member on the Freaks has a V-Bar and his X5 flies completely wobble free, smooth and stable.

If I don't somehow get this resolved in some way or another I will be selling the BeastX unit and going V-Bar.

Grant

[Jamin_00]

Wonder what it is that makes it not work with the X5???

Its a shame Grant as it is turning out to be such a good unit for me so far.

I hope you sort it but if not it will sell quite easily I would have thought

btw, PGK has put a good response to your original post in the other thread

[G-Bru]

Wonder what it is that makes it not work with the X5???

Its a shame Grant as it is turning out to be such a good unit for me so far.

I hope you sort it but if not it will sell quite easily I would have thought

btw, PGK has put a good response to your original post in the other thread

Hi Ben

Yeah, tell me about it, you can imagine my disappointment considering all the testimonials of how good the unit is, which is the main reason for my purchase of the Beast.

I have checked and triple checked my setup:

Blue LED for good geometry and no binding etc etc etc......
New upper and lower main shaft bearings
New main shaft and FES Head
New Turnigy BLS950 Cyclics
Align DS650 Tail Servo
Various foam pad combinations
Blades weighed and balanced
Tried stock Gaui tail blades and KBDD's
Gaui red FBL dampeners, a mate confirmed the black produces the same result (red = 75 hardness and black = 95 hardness) I do wish a 85 hardness existed. I have noticed KBDD do a dampener, just not sure if it will fit the Gaui FES head. Will measure and ring Fastlads.

Maniacs are weighing in at 106.1g & 106.2g each and on the balancer nice and level. I am waiting for a pair of Edge FBL 523mm blades to arrive in stock at Fastlads, will try this first as a last resort before selling the BeastX unit.

Here is a bench test video showing no vibes on the heli.

[ame=http://www.youtube.com/watch?v=KCzgF2kPWN4]YouTube - X5 Bench Test.mov[/ame]

Here is the flight test, pay careful attention to skids at 0.30sec & 1.07min. Sorry for the bouncy flight, gusting wind and trees make hovering a tad difficult.

[ame=http://www.youtube.com/watch?v=zba7uaFeRak]YouTube - X5 Vibe.mov[/ame]

G.

[Ade_Law]

did it drift on aileron too?

the fact you havnt had a reply yet suggests to me that they are looking into the problem.

Ade

[Stuart]

I would suspect this will be a resonance issue, change the landing gear if you can for a different set if its possible I don't know if there are aftermarket versions, but even if you have to hack an align set to try it out.

The beastx obviously is giving others a good bang for its buck - but tbh this is why I stayed away from any system that didn't have the reputation/development in this mode of flgiht, so many have produced system but NOT one meets Vbar's quality, tunability or out the box go and fly not to mention now with data logging I can see any issues in previous flights too.

I'll put money on it that any new systems will all go through the same years of development to meet the vbar level without the need for third party gyro's to hold the tail.

Sorry to hear your woes, but give some alternative skids a go.

[G-Bru]

did it drift on aileron too?

the fact you havnt had a reply yet suggests to me that they are looking into the problem.

Ade

No drift whatsoever Ade, I can take my thumbs off the sticks and she will just sit in the same position, provided there is no gusting wind of course!

On the drift subject this may be associated to subtrim or trim when the unit was setup?

G.

[G-Bru]

I would suspect this will be a resonance issue, change the landing gear if you can for a different set if its possible I don't know if there are aftermarket versions, but even if you have to hack an align set to try it out.

The beastx obviously is giving others a good bang for its buck - but tbh this is why I stayed away from any system that didn't have the reputation/development in this mode of flgiht, so many have produced system but NOT one meets Vbar's quality, tunability or out the box go and fly not to mention now with data logging I can see any issues in previous flights too.

I'll put money on it that any new systems will all go through the same years of development to meet the vbar level without the need for third party gyro's to hold the tail.

Sorry to hear your woes, but give some alternative skids a go.

Hi Stuart

Thanks for the suggestion dude. I believe that 1 of the Mikado models landing brace and skids are compatible with the X5, just waiting on a member from Helifreaks to confirm which one and will give this a try too.

G.

[Vanquish]

I have a similar problem to this with the beastx on my Trex 500. Its rock steady in the hover but I get a small wobble with cyclic inputs. Does yours wobble on both elevator and aileron inputs?

I posted on the beastx forum and got a reply from one of the administrators suggesting it may be the type of cyclic servo's I was using (HS-5245MG). Apparently a swashplate wobble is common with the beastx if your not using fast/powerful cyclic servos. He suggested Futaba S9650's (typically used as a tail servo) is the best cyclic servo with the beastx on a 500 size machine. He also said a good set of flybarless blades such as Edge fbl blades may reduce the wobble.

I managed to reduce the wobble by turning the swashplate gain (pot 1) down but i still get a small oscillation especially with elevator/aireron tic tocs and fast stops.

[Jamin_00]

No drift whatsoever Ade, I can take my thumbs off the sticks and she will just sit in the same position, provided there is no gusting wind of course!

On the drift subject this may be associated to subtrim or trim when the unit was setup?

G.

G, have you got any subtrim or trim in the radio as you should have none!!

[G-Bru]

Hi Sam

No oscillation on the elevator, only on aileron.

Yeah my Turnigy BLS950 servo's are rebranded MKS's. Have my SBEC set to 6V which delivers 11.5kg of stall torque @0.12sec on these servos.

My gain is down to around the 9 o clock position. Going to try up my head speed and try a set of EDGE's when they finally arrive.

G.

[G-Bru]

G, have you got any subtrim or trim in the radio as you should have none!!

Yeah Ade, no subtrim or trim on the TX.

My apologies, I assumed you where experiencing a drift issue therefore my suggestion.

G.

[G-Bru]

Reply from BeastX admin:

There is nothing that could have such a effect from the microbeast point of view
so if you think this is a X5/Microbeast problem, then please sell your microbeast.

best regards,
Walter

First class service and support! NOT!!!!

He did'nt even bother proposing a suggestion! What a ******!

G.

[flypilot]

Don't know if you tried tis allready but mine got alot better when I greased up my spindelshaft really good, also upped the RPM a little..

[robgt]

From what you have said so far, it seems there is a vibration/resonance on the model causing the problem.
As far as the BeastX admin's reply - that's ridiculous.
High or low gain could cause a wobble - to say nothing could cause this from the BeastX is very short sighted... shame.

Another thing worth looking at is the servo slop. For flybarless stuff to work well, your entire system from servo to final ball link should be as slop/play free as possible.

I noticed in your bench test video that the wires come out of the unit and are then bunched together - is that bunching supported somewhere?
If not, it could be that the bunch of wires is carrying some momentum and causing the unit to move slightly in flight? Depends on the sort of flying we're talking about here I guess.

Watching the hover flight, with close up of the skids - they shouldn't be wobbling around like that. If they are securely fixed to the heli then it would appear that you have something bent somewhere on the heli causing them to do that. This would no doubt have an affect on the BeastX unit.

Cheers,
Rob

[Gingerr6]

Hi from your 1st video it looks like the Beastx is only supported by the side frames? is it just my eyes or is this the case? e.g is the beastx fully supported across the whole unit?
May i also suggest you try mounting it on the back of the frame next to the boom?
James.