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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Tail drop/drift backward during inverted hover
08-03-2012 05:29 PM  9 years ago
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uglyrider0078

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Lee, MA

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Tail drop/drift backward during inverted hover
I have a problem that i can't solve the heli is an MA1005 bls253/251 helicommand with rescue mode the heli flies great except during inverted hover the tail just seems to drop and i have to keep on making corrections to keep it level i'm using a 3mm tape under the helicommand and just made sure it's centered but i'm still having the same issue has this ever happend to any of you if so how did you fixed it?
Team Miniature Aircraft
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08-03-2012 06:46 PM  9 years ago
jbiter

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Sebring, FL

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How is your CG? You should be able to hold the heli by the head so the tailboom and main shaft are parallel to the floor and it should stay there.

If the tail drops, as I suspect is your problem, add nose weight or rearrange our equipment as necessary.

Jeff
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08-04-2012 04:41 PM  9 years ago
uglyrider0078

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Lee, MA

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i double check the CG is spot on but i still have the same problem is there something i'm missing in the HC?Team Miniature Aircraft
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08-04-2012 04:54 PM  9 years ago
Heli 770

rrProfessor

USA.

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Are you using any trim to keep the heli level when hovering upright?
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08-04-2012 04:59 PM  9 years ago
uglyrider0078

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Lee, MA

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i use the trim on the HC to level the swashplate which in upright flight it's completely level and flies well i'm afraid if i start adding manual trim or trim in the software to keep it level inverted the trim will also change when flying uprightTeam Miniature Aircraft
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08-04-2012 05:03 PM  9 years ago
jbiter

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Sebring, FL

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You might check whether your swash stays level throughout its travel. Otherwise I would try posting in the FBL forum and maybe someone there has more ideas

Jeff
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08-04-2012 06:07 PM  9 years ago
dkshema

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Cedar Rapids, IA

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Don't use trim to make the swash level when setting up. Do the mechanical setup correctly -- including making sure the swash is level. Then make sure your swash is level all the way up and down the main shaft. Fix that with endpoint settings on your TX. After you get the mechanical setup correct, then go ahead and take care of the HC setup.

Make the CG correct, as well. It sounds as if you may be tail heavy in addition to not having your mechanical stuff right. Don't expect the HC to mask setup and CG problems for you.
-----
Dave

* Making the World Better -- One Helicopter at a time! *

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08-05-2012 11:37 AM  9 years ago
Ronald Thomas

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Gainesville, Fl, USA

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If the CG is that far off, wouldn't the tail drop when he is right side up as well? If it does not, I would think it is a setup issue.Team MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!
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08-05-2012 01:29 PM  9 years ago
F1 Rocket

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Melbourne, Florida USA

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An aft CG would require forward swash trim to correct when the machine is upright. This makes things worse when machine is inverted.

Level the swash in the Trim page of the HC software. Hover the machine and trim any drift by mechanically adjusting the swash linkage. It is normal to need a small amount of right (for clockwise turning blades) swash trim. If you need anything more than a turn to trim an elevator drift you need to correct this using CG adjustment. Some machines may be statically CG neutral but still require some nose weight to hover with a level swash. This is due to rotor down wash interacting with the tail boom and horizontal fin (if used). All of the above assumes the control system is tight and there are not any gross geometrical errors in the control system.
Danny - DemonAero Support Team
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08-05-2012 02:15 PM  9 years ago
uglyrider0078

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Lee, MA

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reporting back..
i still have the same problem, i've work countlessly trying to get the trim perfet.
so i eliminate the trim in the HC got the CG perfect. again got it flying perfect upright and when it's flipped the problem is still there the tail is dropping and needs constant input to keep it level, I also notice the swash is level from zero to top pitch and from zero to negative pitch it's not when i try to counteract by adjusting the end points in the TX the servos don't move, plug in the HC same thing the servos are not reacting to endpoints input. can anyone please tell me what i'm missing
Team Miniature Aircraft
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08-05-2012 02:37 PM  9 years ago
nickt919

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New Orleans, Louisiana

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Vibrations can do strange stuff to FBL helis. If everything is set up correct on the heli and it still does it I'd look at vibrations....head, motor, tail.....
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08-05-2012 04:56 PM  9 years ago
F1 Rocket

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Melbourne, Florida USA

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, I also notice the swash is level from zero to top pitch and from zero to negative pitch it's not when i try to counteract by adjusting the end points in the TX the servos don't move, plug in the HC same thing the servos are not reacting to endpoints input. can anyone please tell me what i'm missing
You cannot use travel adjust like you would on a non FBL machine. From your description above is appears your machine has a geometry issue causing the swash to tilt as it travels. You can play with the Sinus Linearizer slider on the Mixer page of the HC software. The default setting is 5 but sometimes increasing or reducing it can help improve things when the mechanics are not quite right.
Danny - DemonAero Support Team
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