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HomeRC & PowerAircraftHelicopterFlybarless Rotor Head SystemsBeastX › Elevator tic toc problem with CGY750 and Beast X
12-31-2013 05:05 PM  4 years agoPost 1
Jacoub

rrKey Veteran

Kuwait

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Heli: Trex 600 Nitro DFC
Note: I changed the stock black damper to KBDD FBL green dampers but still I have the same issue.

My problem is when I make elevator Tic tocs, I fell Robotic bubbles with high vibration, I tried every gain setting in both system.

When I lower the cyclic gain in
1- BeastX it will solve the problem but my heli is really out of track, it is almost FB without sub-trim.

2- CGY750 long story but still doesn't solve it.

My question is

[B]Are the two units crab in Nitro world Or my heli has an isse from the factory day one?

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12-31-2013 05:30 PM  4 years agoPost 2
knightofcarnage

rrElite Veteran

chicago

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I personal think the 750 is the best on nitro. It has built in vibration cancelation , so unless you have a huge huge issues with tuning than it works like a dream. Wonder if you have an issue with the swash plate guide catching.

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01-01-2014 11:08 AM  4 years agoPost 3
UK Helinut

rrApprentice

Gloucestershire

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If you are using anything other than the DFC machined dampers in a DFC head you are asking for failure. It must be kept stiff or the linkages will fail.

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01-03-2014 03:44 AM  4 years agoPost 4
Kevin Dalrymple

rrKey Veteran

Indianapolis

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check the dampeners like mentioned. also check the servos. sounds like a mechanical problem with the heli and not with the FBL systems

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01-03-2014 02:53 PM  4 years agoPost 5
Richardmid1

rrProfessor

Leeds, England

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Try reducing Direct Cyclic Feed Forward (pot 2) on the BeastX.

Correct setup is crutial as is the use of FBL blades. Did you get the blue light at 6 degrees cyclic pitch at setup point J in the BeastX?

60% of the time, it works every time!

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01-05-2014 02:55 AM  4 years agoPost 6
hhart

rrApprentice

San Jose, CA

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None of the posts above help the guy.... .

Last post definitely wont work! I wonder if you guys even fly a BeastX to the max or understand the design....

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01-05-2014 07:20 AM  4 years agoPost 7
Richardmid1

rrProfessor

Leeds, England

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None of the posts above help the guy.... .

Last post definitely wont work! I wonder if you guys even fly a BeastX to the max or understand the design....
Oh yeah and your post is super helpful isn't it!

We are all waiting for your post to solve this as you understand the design of the beastx so well and also a video please of you flying the beastx 'to the max'?

60% of the time, it works every time!

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01-05-2014 07:26 AM  4 years agoPost 8
Richardmid1

rrProfessor

Leeds, England

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Oh and if you have a better than vague idea of what the heck the op is talking about please share?!

60% of the time, it works every time!

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01-05-2014 07:45 AM  4 years agoPost 9
RogerRabbit62

rrVeteran

Thuerigen germany

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You can observe the small setteling in vibrations in tocs at every system which is adjusted at above the optimum set in timing.

i do not have the above systems but the following is the general way to cure that in a PID

Be sure none of the parameters gets a servo or swash into binding.

Adjust Gain,P and I to a middle working solution on a Gx(PI) type or P I D on a PID type regulator.

Then set P higher until the system oscilates steady ( vibration )
adjust to 60% of that value.
higher I (or D) until a oscilation occurs and lower to 60%
now same on overall Gain.

that is the maximum stability point.
nothing beyons this settles faster, it only produces more oscillations.

if you have "off Track" it is most likely a I-related problem .

To get that you can go slightly beyond the 60% but this is not allways stable.

If you are not satisfied you might then ues harder dampers or a rigid head and check the above again.

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01-05-2014 08:04 AM  4 years agoPost 10
hhart

rrApprentice

San Jose, CA

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^^ Ditto for CGY750... somebody that at least understand the PID system... awesome Rodger

BeastX doesnt offer any PID parameters however.

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01-05-2014 09:12 AM  4 years agoPost 11
UK Helinut

rrApprentice

Gloucestershire

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If you check his other posts, no one can help this guy. He buys stuff, doesn't understand how it works then calls it crap.
Upsets suppliers, then gets no help.

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01-05-2014 09:38 AM  4 years agoPost 12
Richardmid1

rrProfessor

Leeds, England

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If reducing the cyclic gain and/or direct cyclic feed forward doesn't solve the wobbles on fast elevator inputs then it's not the fbl system that's at fault.

The reason I like the beastx so much is the fact it has no wobbles straight out of the box because whoever designed it sorted that out and therefore left very little for the user to 'tweak'.

The guy clearly doesn't know what he's doing, end of story.

60% of the time, it works every time!

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