BeastX v3 - tail 'twitch'

[GtD]

Hi guys, I've just updated from v2 to v3 and gone through all the programming steps as if from new (fitted to a Trex 500 with RJX head).

However, on my 1st few setup/test flights I'm getting very odd tail 'twitches'. The setup all went through fine with blue lights etc where they should be (as before). I get the twitch seemingly at random even in a hover...although I think it is more likely to appear while descending (in a hover).

All dials are in their default position (which is pretty much where I had it under v2...where I had a slight increase in pot3).

I have tried decreasing/increasing tail gyro gain - makes no difference to the twitch. I tried with the new revomix tail pre-comp low and off - also makes no difference.

Originally I had cable tie around the bunch of cables going into the beastX, but took this off and left it off for the 1st flights. I then put one back on - still no difference!

I have changed my main and tail blades back to my older set (in case it all went horribly wrong in the test flights!) - but I've used these in the past without any tail glitches (they are the align carbon tail blades).

any ideas what else I can check?

cheers

J

[stunks]

check to make sure ur not getting any vibration and also v3 runs a higher gyro gain so try with the gain a bit higher and see if that makes and difference

[GtD]

Thanks stunks, I'll try spooling up without any blades tomorrow and see if it all looks steady....but as it was fine before I updated to v3.0 I'm a bit puzzled....I thought v3.0 is supposed to be *less* sensitive to vibration!

I'll let you know

J

[stunks]

Thanks stunks, I'll try spooling up without any blades tomorrow and see if it all looks steady....but as it was fine before I updated to v3.0 I'm a bit puzzled....I thought v3.0 is supposed to be *less* sensitive to vibration!

I'll let you know

J

Ok let me know how u get on but also when u upgraded to v3 did u reset the whole system because u are ment to reset it

[rapidgaz]

Ok let me know how u get on but also when u upgraded to v3 did u reset the whole system because u are ment to reset it

Think it's automatically reset when u update.


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[stunks]

Think it's automatically reset when u update.


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oh ok didnt know that but i still reset mine just to be safe

[Mslater]

Think it's automatically reset when u update.


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Gaz - have you got a USB lead I can borrow ?

[GtD]

Hi - a quick update. Yes, the update to v3 resets everything anyway (i.e. servo type etc all goes back to default) so I did the setup from scratch.

I've just spooled up with the main & tail blades removed. The swash and tail seem to stay steady...but...if I hold say the tail boom I can feel a vibration....and one of the tail boom braces is visibly vibrating (the other is vibrating but less so). Now...I've no idea if this is normal! this is without the entire head. I did have a crash ages ago and replaced almost everything, including tail boom & torque tube - and I've not even had a rough landing since then.

anyone else every tried this on a Trex 500...and if so should I expect no vibration at all?

finaly question - my understanding of the Trex 500 manual is that the torque tube bearing should be a little way off the centre point of the tube itself (i.e. not in the exact centre) - is that correct?

cheers

J

[J-S-Q]

I can't remember specifically if I've spooled up my TRex 500 without the main and tail blades but I've certainly done it with other helis and I didn't see the tail braces vibrating. That does sound like you probably have something bent or out of balance somewhere.

[GtD]

hmm...it looks like I have glued the torque tube bearing right in the centre (clearly didn't interpret the manual correctly at that time!) - so I added an old (and I mean really old and notchy) TT bearing onto the TT a few inches closer to the front and that does seem to reduce the vibration...so I think I may order a new bearing and go for fitting 2. However, when I put the tail grips back on there is more vibration (although still less than before) - so I'm wondering if there might be something a little odd with the tail grips (they are the std align metal ones).

hey ho...all good fun!

will let you know how it goes!

J

[Fixxxer]

Tail shaft ?

[GtD]

which bit do you mean by the tail shaft? The boom, TT front and rear TT gears are all pretty new. Do you mean the shaft that has the TT gear on one and and goes at 90 degrees to the boom (part H50097T) ? as that is new as well

Looking around at parts I'm tempted by some shiny new tail grips such as these...MH-TX5142 (paste that code in here Midland Helicopters Ltd Search ) - I've always found the align metal ones I have seem to have a slight wobble...I wonder if these might be better?

mind you the upgraded tail pitch slider looks rather nice too! MH-TX5193

<must resists....must resist....>

[Fixxxer]

The actual shaft that the tail hub bolts to although you say this is new. It doesn't take much to bend them slightly tho and check the bearings that this sits in. Also check the tail hub, unlikely but ya never know.

[Zeeflyboy]

Torque tubes can be a pain - it's worth adding some bearing supports...

Also take the whole tail hub and blades off as one unit and balance the whole lot together. Much more effective than just balancing the blades.

And yes, V3.0 resets everything so you have to start from scratch. The behaviours are different too, so you can assume parameters and gain will be the same as you had set in V2.0....

The good news is once you've set it all up V3.0 is very good.

[rapidgaz]

Gaz - have you got a USB lead I can borrow ?

Yes mark I have, give us a call.


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