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Home✈️Aircraft🚁HelicopterAerial Photography and Video › wookong- some setup problems - professional...
04-06-2012 05:30 PM  9 years ago
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germany

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wookong- some setup problems - professional...
hey there,

I do have a trex 600 stretched up to 690 with a camera mounted on the front. take off wight is 7.2 kg. everything is working pretty good. I've installed the wookong h and still have after 9 test- and optimisation flights some problems.. The documentation is very baaad or difficult for me to understand...

my measured CG point is about 1-2 cm more right (seen from the back) and 8 cm more down than the tail boom. I enter this in the DJI Setup für GPS and IMU.

1. when iam going to fly straight, I have a drift to the left. whats wrong? when iam hovering the rotorblades are not horizontal but it holds position. in ATTI Mode i have a fast drift to the left because of this failure i think...

2. at hovering the copter does not hold position very good. It drifts around 1 m also at zero wind... I think it reacts to slow. where can I change this?

3. if i make a pirouette while hovering, it seems the center is some centimeters more to the right and it does not rotate during the main shaft...

4. the hole system is swinging somehow light to front/back. maybe 1 cm at all.. which menue is that?

5. the tailgyro is pretty hard and fast... also in the picture i see some little sing left/right from the tail gyro all the time.. i think i have to reduce to one lower Hz ?

sorry for my bad english Iam a germyn guy

would be great to have some answers

best

Sebastian
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04-09-2012 03:36 PM  9 years ago
KWR35

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Helena, MT 59601

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Sebastian:

I'm sure I don't have all the answers you're looking for but I will share my experience. I have a Trex 700e and have had some of the same issues.

The Trex tail rotor design is very aggressive and the WK-H really can't keep up with it. To calm it down a bit you can use the center hole on the servo arm (but the push rod will now have to be on the outside of the arm or it will bind) and/or use less aggressive tail rotor blades such as 105mm maverik or ms composite. That is the only way I was able to eliminate all of the tail wag from mine (and still have it function properly). Using a lower Hz made a difference (for me) but did not solve the problem.

If your Trex is NOT holding position well in hover you can increase the gain in the "auto pilot" function. Do it in 10% increments. If it starts to oscillate, back off 20 or 30%.

For drift in ATTI mode, adjust your left and right (and/or forward and aft) swash plate links until there is no change in attitude when switching between GPS hover and ATTI mode. This should take care of your left drift when flying forward. It may also help with pirouettes. Be sure to re-initialize the WK-H between all changes.

In a stable hover, the rotor blades are seldom flat. If it is holding position, it's doing what it's supposed to.

I'm not sure I understand your 4th queston. Is your Trex FB or FBL?
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04-09-2012 04:03 PM  9 years ago
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germany

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Hey!

thank's for your answer...

I was working on it again yesterday and did not find any better working situation for the Tail... The stop position is not very clear even with the reduced Hz of the Tailservo... mhhh

you use smaller tailblades? also in windy conditions without problems? At strong winds I have had problems with smaller ones...

I try the gain thing for holding position.. In the ACE ONE Manual I found out that the I value is also a point to look at for position holding.. the higher the value the faster it corrects a drift or something...

I do not have any drift in manual mode... I measured my C.G. and fixed it to exactly the middle... but if i go to ATTI the heli starts to drift fast to the left... in GPS everything is ok.. maybe the IMU is mounted not horizontal? or is defect?

re-initialize is just power off/on the system?

4th... I use FBL. Andy I see that the system is doing something or correcting the flightposition very fast.. to fast..... nick foreward, backward, foreward, backward... ... i hope you understand...

did you find a way to reach step by step the perfect values? Or just try and error... ?

thanks alot!

See
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04-09-2012 05:55 PM  9 years ago
KWR35

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Helena, MT 59601

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Sebastian,

I fly a lot in wind and the smaller tail blades work fine. I'm not doing 3D with my Trex, just AP.

The "I" value does affect position hold. A little trickier than adjusting the gain. Use caution.... Once again, 10% (or less) change at a time.

My Trex had a similar drift issue. No drift in manual or GPS but would drift in ATTI. I adjusted the swash plate lingage to correct the attitude in ATTI. Manual and GPS did not change. Be sure to do this in dead calm wind to get a correct setting because GPS will correct for wind and ATTI is not intended to. Here's why I think this is so: In GPS mode, the gps holds the attitude required. In manual mode, the attitude is held where every you place it with the gimble (somewhat unique to FBL). In ATTI mode, the attitude is held to a pre-determined position adjustable by linkage or trim.

Re-initialize is power off then on. As well, you need to do tx calibrate each time a change is made to your transmitter.

If the system is too quick, this is adjusted in the Flybarless section of the WK-H. All four of the functions in this section affect this.

Unfortunately, I have not found a step by step procedure for set-up. A lot of trial and error because so many things interact with each other.

Good Luck.......
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04-09-2012 07:09 PM  9 years ago
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germany

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how big is your takeoff wight?

i think my 7 kg's are very stable at the moment.. but I didn't have a chance to try it at wind.. in Capetown if ly a microbeast at this setup at 5 bft which was ok... I hope to get more stable effects from the dji...

i think the 8m/s wind for position hold is just for "normal" helicopter setups and not with cameras or something like this mounted... so i think for me it can be a lot more because of the inert mass of the hole setup...

what do you think?

i try your input next time.. i hope i find something to fix my problems... for me it seems that there are just 1% steps to make it good or bad...

best

See
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04-09-2012 08:27 PM  9 years ago
KWR35

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Helena, MT 59601

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My take-off weight is 8.2 kg.

I think you are right about the 8m/s wind being for normal helis. The AP helis will be more sensitive to wind because of cross sectional area.

I have not found this set-up to be sensitive down to the 1%. Probably only within 5-10% really.
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04-18-2012 04:15 PM  9 years ago
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germany

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I cannot find a real good fix for the tail wobble effect...

changed to smaller fins
changed to smaller soft fins
checked different Hz rates

I used the center hole of the servo arm..

what can I do?

greeze

Sebastian
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NEW  07-15-2021 08:48 AM  11 days ago
Martin68

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Venray. Nedeland

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Helllo i'm Martin

Did you find the Solution for the drift to the left?( See)
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NEW  07-15-2021 02:22 PM  11 days ago
banshee rider

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Phoenix AZ.

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after 9 years I dont think its a concern anymore !ageing is manditory maturity is optional
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NEW  07-15-2021 08:44 PM  11 days ago
Martin68

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Venray. Nedeland

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NEW  07-17-2021 03:47 AM  10 days ago
Rojoalfa

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Punta de Mata, Monagas-Venezuela

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/
/

WooKong-H is still flying out there...

So, any information is still useful.

Mine, it has a broken GPS so now it is a lite version.

/
Saludos cordiales,
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