[weijay]

Hi Guys,
I have a problem with the collective pitch of my HK450 not going to full range. Collective pitch only at +/- 5 deg. I have tried looking through the GSC, put i could not find anything that was controlling the Min /Max of the collective pitch. So could you guys help me out with this please.

both input and output configuration of controls were Min/Max :1200/1800.

on the swashplate leveling (under vehicles), i was able to get +/- 12 deg. But when I control the helicopter with the TX (Turnigy T9X) i can only get the reduced +/-5 deg collective pitch control.
 

openpilot gsc is version 14.

Thank you in advance for your help.

Wei

[daveapplemotors]

Out put can go 980 to 2150 maybe farther. Try that.

Did you do "Manual Calibration" with defaults in your TX?

[hwh]

...openpilot gsc is version 14...

OpenPilot release 14 is ancient, why are you using that old a software?

[weijay]

Hi Guy,
Thank you very much for the reply.
Sorry for the delay response to your suggestions, as I don't always get the luxury of working on my RC planes, due to a young family.

I was using version 14, because there was some issues with my setup due to version 15, (indicated by one of the threads in the forum), but can't remember exactly what now.
Nevertheless, I have changed the GCS to version 15 and tried to setup my helicopter from scratch.

Initially it was pretty good. I was able to setup 3 modes on channel 5, and managed to get my swash plates leveled, and setup both mechanically and digitally for my collectives to do +/- 12 deg. However after I start making adjustments to the stabilization setting, my collectives became not moving much, may be just 1or 2 degrees. I tried to rest all the setting with the default button, but that didn't fix it either. My stabilization mode was actually on manual for both pitch and roll, yaw is controlled by the automation, and throttle is also on manual. Could you guys give me a clue what had went wrong please. thank you very much.

[daveapplemotors]

Weijay,

I hope all in your family are healthy. And I hope you can share RC with someone.

You are doing great. You have servos moving and swash level--that is fantastic. You are winning.

In Configuration \ Stabilization \ Advanced \  Rate Mode Response -- (near top of page)
Try "RATE = 540 manual mode" for Roll, Pitch & Yaw and you will see some more servo movement. I always set the Max Rate Limit to be at least 570 so that the helicopter can add it's own corrections. The default, 220, is too low--even for quads. The servos don't need to move much to roll a helicopter only 220 degrees / second. It it hard to see.

I believe stock Blade mcpx and ncpx are set to 540 degrees / second at the factory. You can set it to roll / pivot / pitch faster OR slower by using endpoint or D/R settings in your TX. 

With 3 flight modes you set each bank different PIDs and compare mid flight. I make Settings Bank 1 mild (proven, no oscillations) and easy to switch too. Settings Bank 2 is a little quicker (larger P, I) and settings Bank 3 is a little larger still. If it does not oscillate in Bank 3 then land your heli, connect to computer and make Bank 1==Bank 3, make Bank 2 a little larger, make Bank 3 a little larger. Test and repeat until you see oscillations on Bank 3 and not on Bank 1. Do this for each axis: Roll, Pitch, and Yaw.

Land the heli to change flight modes at first but when it flies better you can switch in mid air.  I do all my tuning in Rate, Rate, AxisLock. After you have it tuned up then use the 3 flight modes to experiment with Rattitude, Attitude, Acro+,Vbar, etc.

Attached is a very stable but also quick handling UAV for an HK250GT with Tarot head. When work and weather break I will do aerobatic and 3D testing. And maybe record a good video.

[weijay]

Dear Dave,
Thank you very much for the detailed response and suggestions.

I fixed my collective problem by changing the "swashplate configuration" from 120 to 140 and then back again. So this seems to be due to a software bug. I initially tried changing RATE to 540, but it didn't work.

I also fixed the little movement of the roll and pitch. This was done via the pitch slide bar setting on the vehicle page/Helicopter.

However "Now I have a NEW problem"
   My collective servos (all 3 of them) make sudden up and down movements (like twitches) when i movement my collective joystick movements of the TX. Before, I can fix it by setting "Neutral position" value of the collective to the same value as "Min" in input settings, however this no longer works me. Please give suggestions. Thank you very much in advance. Cheers

Wei

[daveapplemotors]

Hello Wei,

You are welcome. I hope you get it flying well soon.

Yes the 140 save and then 120 save has been the work around for that bug for over a year now.

Keep the rates at 540 for flying later.

Attach your current UAV so maybe we can have a go at your new problem.

be well,
Dave

[weijay]

I have attached my UAV file here.

My Transmitter is T9X using ER9X firmware.
Receiver is hobbyking 6 channel using PPM connection with the CC3D control box.

Servo is HKSCM9 digital servo for collective, and turnigy DS480 digital servo for tail servo. The tail servo works well.

ESC: hobbyking 40A blue SBEC.

Thank you

[daveapplemotors]

Hello Wei,

From your UAV:
   <field name="ChannelMin" values="985,987,990,986,985,985,0,0,0,0"/>
            <field name="ChannelNeutral" values="1200,1494,1494,1491,1491,985,0,0,0,0"/>
            <field name="ChannelMax" values="1993,1997,1996,1997,1997,1994,0,0,0,0"/>
            <field name="ResponseTime" values="0,0,0,0,0,0,0,0"/>
            <field name="ChannelGroups" values="PPM,PPM,PPM,PPM,PPM,PPM,None,None,None,None"/>
            <field name="ChannelNumber" values="6,4,2,1,5,3,0,0,0,0"/>
         
Correct me if I am wrong but isn't channel 6 collective?  And the first values are for channel 6, yes? If I am right about channel 6 being collective then the neutral value is much higher than the minimum. 985-min 1200- neutral. I see that the sixth set of numbers--corresponding to Channel #3-- have the neutral close to the minimum.

[weijay]

My TX setup was
Ch1:yaw
Ch2: pitch
Ch3: Collective
Ch4: roll
Ch5: flight mode
Ch6: throttle:

If this may potentially give problems then I can easily change them.

Wei

[daveapplemotors]

Hello Wei,

I do not see any problems with the gs 15a.UAV file. Yet. I will look more.

Did you do "manual calibration" on your TX with defaults set in the TX using no D/R or expo and with default throttle and pitch curve settings? 

[weijay]

Thank you very much Dave. I did every thing in manual calibration. No D/R and Expo so far.
Could it be a HK receiver thing? I couldn't do pwm connection with the turnigy stock receiver though.


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[daveapplemotors]

Hello Wei,
s
I don't know what is causing your jitters. I won't eliminate anything yet. It could be receiver but I don't know.

I have seen jumpy servos due to my own bad wiring. A stray strand or wire from a servo wire that I had shortened caused me trouble once.

[weijay]

Hi Dave,
I tried to setup a new connection using my second cc3d board. This board was bight from hobby king, and the other board was purchased from a different source. They are different in colour, but they we are now uploaded with the same firmware: ver. 15 .

I am now using a different type of servo: the HXT900.
A different ESC. I am now using the turnigy stock 9x receiver, instead of the HK6 channel receiver, and it is running on PWM, in stead of PPM.

I am using same radio with the same settings. The battery pack is the same.

HOW EVER, INTERESTINGLY I was able the reproduce the same collective twitch as the previous setup.

Do you have any suggestions? Thank you.

Wei


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[daveapplemotors]

Hello Wei,

I must confess I have not studied your UAV any more, yet. I have been busy. I will this evening.

Have you tried putting collective neutral slightly above minimum?
And throttle neutral slightly above not equal?

My friend Karla, who is in Beijing, is here now. And maybe he can help. He is smart.