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Old 05-27-2019, 08:23 PM   #1 (permalink)
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Default 450 5 blade head in an MD500E with hair raising characteristics

When the skids get light, the disk suddenly rocks to the left rear (quadrant 3 for geeks), but it can be offset with vigorous cyclic application to the right front. I'm certain that the swash is dead nuts level and the Brain2 is set up correctly, so I think that perhaps the phasing is off? Thanks to the mcpx main blades shortened for the tail feathers, tail authority is no problem. Thoughts?

TIA

jim
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Old 05-28-2019, 06:11 AM   #2 (permalink)
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Have you checked for vibrations? What happens when you spool up without any blades - does the swash do the same?
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Old 05-28-2019, 02:26 PM   #3 (permalink)
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Great idea getsuyoubi, tnx for suggesting, don't know why I didn't think of it (too focused to think straight, I guess). All the blades are balanced dead nuts and the swash acts correctly, exactly as it should. So I'm still baffled.

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Old 05-28-2019, 04:57 PM   #4 (permalink)
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What brand of head. Many incorporate the correct phasing into the construction.

Seems like a vibration issue. The MEMS sensors getting shaken around; it thinks is is not level when it is level.
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Old 05-29-2019, 02:05 PM   #5 (permalink)
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You say you have a brain 2. I have seen this behavior when self-level is accidentally turned on. Could that be the case?
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Old 05-29-2019, 09:10 PM   #6 (permalink)
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I don't know the head brand, it came with the fuse and blades.

The blades were all balanced dead nuts; at spool up there's a short bit of minor vibration, then it's rock solid. When I spooled up on a table with no blades it sat rock solid, no vibration at all.

I put one blade over the boom and it stayed steady when I applied +/- elevator, so I'm confident that the phasing is correct. I knocked the heli off a table last night and broke the skids, so it'll be a day or so before I can fly again. I'll just try to fly thru the peculiar behavior - a challenge to my skills.

jim
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Old 05-29-2019, 09:16 PM   #7 (permalink)
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Ah, tnx Echo, I'll check. I know that Brain cautions against self-level on launch. It's too much to hope that could be the solution :-)

jim
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Old 05-30-2019, 04:08 PM   #8 (permalink)
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Any self leveling controller will cause tipping to the direction where cyclic inputs are applied right at the point the skids off the ground.
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Old 06-03-2019, 09:45 PM   #9 (permalink)
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Tnx for the helpful suggestions. Turns out the blade tracking was off. I noticed when I built it that 2 of the CopterX blades had a "bow", but didn't think that would make a difference. Bzzzt, wrong answer.

jim
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