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Atom 7HV › Violent tail kick on 7HV with blueline vbar
10-04-2018 03:29 AM  76 days agoPost 1
Band1086

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Kennewick, Wa. USA

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I hovered my 7HV with blueline on it first time today. 1850 headspeed or something. The tail kicks pretty hard. The gain is set at 50 which is apparently pretty low. I have been out of flying for a while but remember this happening from time to time on other helis, but I can't remember what the fix was. Possibly a more solid gyro sensor mount? I have it mounted on the bottom plate between the landing gear, but that may be too flimsy. Any thoughts? Thanks

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10-04-2018 10:59 AM  75 days agoPost 2
Flyin for Jesus

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Troy, IL. 62294

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You'll need to describe what "kicks pretty hard" means?
When does it do it? Pitch pump, head speed change, just hovering????
What does it do?

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10-04-2018 03:44 PM  75 days agoPost 3
Band1086

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Kennewick, Wa. USA

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Just hovering, nothing else. The tail just randomly kicks kind of like a single axis gyro would if it were not secure enough or getting too much vibration. I'll try repositioning the gyro sensor when I get a chance, but in the mean time, any thoughts? Thanks

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10-04-2018 06:15 PM  75 days agoPost 4
Flyin for Jesus

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Troy, IL. 62294

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I had that problem once and it was with a single axis gyro. The fix that time was shorten the servo arm and all was fine after that. ( of coarse, setting the endpoints and gain again )

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10-05-2018 01:52 AM  75 days agoPost 5
Band1086

rrElite Veteran

Kennewick, Wa. USA

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That's a good thought. The arm is the length the instructions say, but I might try shortening if the repositioning of the sensor doesn't fix it. Thanks for your input.

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10-05-2018 03:30 PM  74 days agoPost 6
Rob43

rrKey Veteran

Midland, MI USA

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This could also potentially be a static hit. Is there a ground wire providing electrical continuity between the motor mount and boom? I have always used a wire to provide this path for the belt static to shed. I use an multimeter to check for the continuity to be sure.

Rob

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10-05-2018 03:46 PM  74 days agoPost 7
Band1086

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Kennewick, Wa. USA

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That was another thing I was wondering about. Thanks for bringing it up. The instructions say nothing about it, but I have heard about it. It is something I will do. Have you ever mounted the gyro sensor in the middle of the bottom plate and had any trouble?

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10-08-2018 08:14 PM  71 days agoPost 8
Rob43

rrKey Veteran

Midland, MI USA

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I've never mounted below the original plate. I've added a second plate above for the sensor, separate from the main unit.
https://www.helifreak.com/album.php...pictureid=81602

Rob

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10-09-2018 04:19 AM  71 days agoPost 9
Band1086

rrElite Veteran

Kennewick, Wa. USA

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Now that's a quality job. Very nice, thanks for posting it.

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10-12-2018 05:30 AM  68 days agoPost 10
Band1086

rrElite Veteran

Kennewick, Wa. USA

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Well, it looks like it was the gyro sensor mounting position. Remounted and no more kick. Thanks all for your responses.

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