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HomeAircraftHelicopterAerial Photography and Video › My life with the Helicommand....
02-07-2008 03:01 AM  10 years agoPost 61
Disciple4123

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USA

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Diagnosis...
Trackhead and Nooobs:

1) What are you powering the aircraft with? 4.8v, 6v, batt or generator, etc? Could you be undervoltage, or over?

2) Is your unit hard mounted to the heli, or vibration isolated somewhat?

3) Are either of you running any torroid chokes?

4) Are any of you plugging extra wires fron the circuit board back into the HC, as per the manual? (The issue I have with this, is which polarity to plug it back into, it could be reading a stray signal from itself right into the input, you get what I mean?)

When I first got HC, and did not have it engaged I had a hard roll right w/crash. I believe it was a lengthened servo wire and some EMI, as I was running twin gas engines. I had the HC in the off, or very low gain setting then. Since then I set it up with torroid chokes on all wires and a single engine, it has been fine.

I am trying to get a feel for what may be happening.

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02-07-2008 03:24 AM  10 years agoPost 62
nooobs

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02-07-2008 03:31 AM  10 years agoPost 63
Disciple4123

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1) OK, so you run 7.2volts to the electronics? I think that may be over spec for the HC.

4) Do you plug that one back to the HC so that the signal wire (only one) plugs to the ground side or to the signal side? Was I clear about what I meant with it picking up a singal from itself and potentially messing things up if the sig wire is not plugged with the orientation toward the ground side?

My heli answers for reference, although I think I have not had problems as you describe...

1) running a 6v pack and custom 6v alternator set to exactly 6.0v
2) running a custom mount that is slightly more isolated than their reccomendation, a little cushier than stock.
3) running torroids made of small chain links on every single lead, two on the tail.
4) Plugging the autotrim lead back into the unit, sig wire toward ground, not toward signal side

I am just trying to diagnose a problem that could get any of us, my goal is certainly not to be condescending or micromanage the situation, I just dont want more crashes and don't want others to have them either, organizing diagnostic clues early on can sometimes help find answers

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02-07-2008 03:44 AM  10 years agoPost 64
trackhead

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utah

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Disciple,

My HC worked flawlessly for 2-3 months. The last two months is when it has been a pain in the butt. Something went wrong somewhere. I haven't changed anything.

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02-07-2008 07:04 AM  10 years agoPost 65
nooobs

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02-07-2008 09:11 AM  10 years agoPost 66
butters149

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monterey park, ca

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so ur saying that i should plug the single green wire(gyro) back into the HC? whcih side of the HC, the one with the 3 or 4 prong? i heard that if you do this you can still get feedback. but yea i dont have the autotrim because i only have a 6 channel receiver. when i trim it manually from the TX do i have to press the SET button and then restart the HC and then set the trim on my tx back to neutral? im confused.

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02-07-2008 02:00 PM  10 years agoPost 67
rerazor

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Mich.

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I don't plug the extra wire back into the HC mixer board. I get some weird glitch's when I did.

I ground the tailboom on all my helis with belt drives. Its been proven that belts cause static build up. Joker helis come that way and the Mikao helis offer an option for it also.

B149,

If you touch the trim on the TX you have to hold the SET button and re-start each time, don't touch the trims again or you have to go thru the SET button procedure again. The SET procedure tells the HC what is the "new" neutral setting. That is why the autotrim feature is nice, you don't have to land and re-power each time.

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02-07-2008 02:42 PM  10 years agoPost 68
Disciple4123

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USA

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And I trust that trims that vary by flight mode position would also be affected. I have my trims all equal / zero, and some subtrim present which is known by the HC thru the button procedure.

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02-07-2008 02:44 PM  10 years agoPost 69
rerazor

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Mich.

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Yes, all trims must match in each flight mode on your TX. HC does not know what flight mode your TX is in. I made that mistake a few times.

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02-07-2008 03:03 PM  10 years agoPost 70
rerazor

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Mich.

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RE: Static build up. They clearly state to ground the boom in the manual.

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02-07-2008 03:09 PM  10 years agoPost 71
Disciple4123

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USA

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so ur saying that i should plug the single green wire(gyro) back into the HC? whcih side of the HC, the one with the 3 or 4 prong?
we are referring to plugging unused, single conductor leads off of the mini circuit board, back into that mini circuit board, not plugging it into the grey HC unit, that would be a no-no. Since symptoms are being described by Rerazor about his experience plugging it back into the unit, I will just adhere mine to the circuit board with double sided foam rather than plugging it. The HC directions are ambiguious on page 21, see below
From HC manual, page 21--
• Unused input cables can be stowed away by turning them through 180° and connecting them to unused sockets on the receiver or the RC module.
Regarding autotrim, I did it manually by inputting the perameters after test flights on the three adjustments (computer program link). I have not had to re set it, and I do not have it hooked up to autotrim. Captron is mysterious about HC's workings, but my best guess is that there is a slow IMU present in the unit that would not be fast enough for flight control, to augment it's performance a three axis gyro is included which provide more dynamic feedback in flight. If that is true, there would be no need to alter autotrim perameters unless you physically tilt the sensor on the heli, right?

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02-07-2008 03:15 PM  10 years agoPost 72
rerazor

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Mich.

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Or if you change the CG of the heli or to compensate for wind.

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02-07-2008 03:18 PM  10 years agoPost 73
trackhead

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utah

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I don't have my heli grounded, perhaps I'll give that a go. Either way, I need another HC for the backup heli. Great reason to spend some more money too.

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02-07-2008 03:45 PM  10 years agoPost 74
nooobs

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02-07-2008 08:58 PM  10 years agoPost 75
trackhead

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utah

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Track aren't you using torque tube?
Nope, all stock. My philosophy on AP/AV is to use the cheapest set up, within reason. That way, when the inevitable crash comes, tears are not shed. Keeps the profit margin where it should be too.

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02-07-2008 09:23 PM  10 years agoPost 76
butters149

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monterey park, ca

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how do i ground it? do i just tie a wire to the boom and tie it to the carbon fiber chassis? whenever i trim with the tx do i have to press the SET button?

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02-07-2008 10:14 PM  10 years agoPost 77
nooobs

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02-08-2008 12:43 AM  10 years agoPost 78
rerazor

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Mich.

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The joker (noobs low quality pic ) works because the frame is CF and conducts electricity. For Helis with plastic frames you have to go to the motor mount etc... Also, make sure on metal booms that you sand the paint off to make conductivity. You can check with a volt meter (ohms setting) from the tail to the motor etc...

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02-14-2008 05:13 AM  10 years agoPost 79
crazzyjoe

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Severn, Ontario, Canada

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Does the HC work with 2.4ghz radios? I can not seem to find that info any where.

Joe

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02-14-2008 07:07 AM  10 years agoPost 80
nooobs

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